Interactive system and associated interaction process

Abstract

Interactive system (1) with at least one user occupying a vehicle, in particular a car, said system comprising: - At least one sensor (7) arranged to provide a measurement of at least one physiological sign (10), in particular a heart rate and / or respiratory rate relative to the user, - At least one camera (2) arranged to record at least one image (12) of the user, - A control unit (3) configured to, from the measurement of said physiological sign (10), deduce at least one physiological state (11) of the user, - A display device (8) arranged to display the recorded image (18) and information to assist in the completion of an exercise (15, 19). Abbreviated figure: Fig. 2

Description

Title of the invention: Interactive system and associated interaction method

[0001] The present invention relates to an interactive system with at least one user occupying a motor vehicle, in particular a motor vehicle. The invention also relates to a method of interacting with a user occupying a motor vehicle, in particular a motor vehicle.

[0002] The transition to autonomous or semi-autonomous vehicles presents increasingly important challenges in creating intelligent, intuitive vehicles that make driving and / or travel more pleasant and safer for vehicle occupants. In particular, improvements can focus on safety, comfort, and entertainment. In such autonomous or semi-autonomous vehicles, passengers and drivers have more free time during which they can enjoy themselves or relax. After a period of manual driving, the driver may experience stress or active fatigue (cognitive overload due to driving) due to prolonged manual driving or stressful driving conditions (traffic jams, other road users' behavior, etc.). The driver may also experience passive fatigue (cognitive underload), which can lead to a lack of driver vigilance.In both cases, it is necessary for the driver to restore a state of “calm alertness” either by switching to automated driving or by stopping.

[0003] Today there are exercises, including breathing exercises such as cardiac coherence exercises, which alleviate stress, active fatigue, or passive fatigue by promoting a state of calm alertness.

[0004] FR 3 104 283 A1 discloses an interactive system that determines the user's physiological state and prompts the user to improve it. US 2019 / 061772 A1 discloses a system for monitoring the health or well-being of a person located in a vehicle. CN 105 476 647 A1 discloses equipment that helps regulate a driver's breathing rate. Finally, WO 2015 / 181078 A1 discloses a system for ensuring conscious breathing within a room.

[0005] Today there is a real need to help the driver of an autonomous vehicle to better manage his fatigue and stress in order to bring him to a level of calm vigilance and improve the safety of users, particularly when taking back control of the vehicle.

[0006] The object of the present invention is to propose a system and a method to bring the driver to a level of calm vigilance for safer driving.

[0007] The invention relates to an interactive system with at least one user occupying a vehicle, in particular a car, said system comprising: - At least one sensor arranged to provide a measurement of at least one physiological sign relevant to the user, - At least one camera configured to record at least one image of the user, - A control unit configured to deduce at least one physiological state of the user from the measurement of said physiological sign, - A display device arranged to display the recorded image and information to help complete an exercise.

[0008] Thus, the system allows the user to become aware of his condition by seeing himself as he is before starting an exercise by seeing the recorded image, and helps him to perform an exercise to relax him and bring him to a state of calm alertness.

[0009] According to one aspect of the invention, the physiological sign is a physiological sign having a measurable frequency, for example a heart rate or a respiratory rate.

[0010] According to one aspect of the invention, the display device is arranged to display the measurement of at least one physiological sign, for example, a heart or respiratory rate. For example, the display device is arranged to display a real-time tachogram. The tachogram corresponds to the curve that displays the variability of the heart rate (expressed in beats per minute, Bpm) as a function of time.

[0011] The user can thus become aware of his physiological state, in particular his state of stress or his state of fatigue.

[0012] According to one aspect of the invention, the system is arranged to offer the user an exercise, in particular a breathing exercise and more specifically a heart coherence exercise, based on their deduced physiological state until they reach a target physiological state. A heart coherence exercise consists of performing six breathing cycles for five minutes.

[0013] The target physiological state is understood here to be a physiological state of calm alertness. This target physiological state can be achieved through a heart coherence exercise. This target physiological state is characterized in particular by a correlation between the user's heart rate and respiratory rate, and / or by a respiratory rate between 0.06 Hertz and 0.12 Hertz.

[0014] According to one aspect of the invention, at least one sensor is arranged to continuously provide a measurement of at least one physiological sign throughout the duration of the exercise.

[0015] According to one aspect of the invention, at least one sensor is arranged to provide in real time a measurement of at least one physiological sign throughout the duration of the exercise.

[0016] According to one aspect of the invention, the system comprises at least a first sensor arranged to provide a measurement of the user's respiratory rate and at least a second sensor arranged to provide a measurement of the user's heart rate.

[0017] According to one aspect of the invention, the first and second sensors are arranged to continuously provide a real-time measurement of heart rate and respiratory rate throughout the duration of the exercise.

[0018] According to one aspect of the invention, at least one sensor can be a contactless sensor.

[0019] Alternatively, at least one sensor may be a sensor arranged to be in contact with a part of the user's body, for example a sensor arranged on the steering wheel arranged to, in contact with the user's hands, measure at least one physiological sign relating to the user.

[0020] According to one aspect of the invention, the system is arranged to offer the user an exercise based on the physiological state deduced by the control unit and to display information to assist in the completion of said exercise by the display device.

[0021] According to one aspect of the invention, the control unit is arranged to compare the measurement of the physiological sign provided by the sensor to a data representative of a state of fatigue of the user, in particular active fatigue or passive fatigue, and to propose to the user to perform an exercise according to the result of this comparison.

[0022] Alternatively, the control unit is configured to compare the physiological sign measurement provided by the sensor with data representative of the target physiological state to be achieved, in particular a state of calm alertness, and to suggest that the user perform an exercise based on the result of this comparison. Thus, as long as the physiological sign measurement provided by the sensor does not correspond to the data representative of the target physiological state, the display device is configured to display information to assist in performing an exercise.

[0023] According to one aspect of the invention, the control unit is arranged to verify whether the user reaches the target physiological state. In other words, the control unit is arranged to verify the user's ability to achieve cardiac coherence during exercise.

[0024] According to one aspect of the invention, the control unit is arranged to verify that the respiratory rate is between 0.06 and 0.12 Hertz, preferably about 0.1 Hertz, and / or that the heart rate is correlated with the frequency Respiratory. Indeed, when we perform a heart coherence exercise, we adopt a breathing rate of six cycles per minute. At this rate, the heart synchronizes with the respiratory cycles, and the respiratory rate has a value of approximately 0.1 Hertz.

[0025] According to one aspect of the invention, the control unit is arranged to modify the recorded image progressively throughout the exercise to obtain a progressively modified image throughout the exercise.

[0026] According to one aspect of the invention, the control unit is arranged to modify the recorded image until an image is obtained representing the user as he or she might be at the end of the exercise period, in other words, an image of the user rested and relaxed.

[0027] According to one aspect of the invention, the control unit is arranged to modify the recorded image according to the measurement provided by the sensor.

[0028] According to one aspect of the invention, the control unit is arranged to modify the recorded image progressively throughout the exercise according to the evolution of its physiological state.

[0029] In other words, the control unit is arranged to progressively modify the recorded image so as to display a representation of the user who is increasingly relaxed and rested as the measurement provided improves during exercise.

[0030] According to one aspect of the invention, the modified image may be a three-dimensional representation of the user or a part of their body, in particular their face. For example, the modified image is an avatar of the user.

[0031] According to one aspect of the invention, the display device is arranged to display the image recorded by the camera before the start of the exercise, then the image artificially modified during the exercise, and then again the image recorded by the camera at the end of the exercise.

[0032] According to one aspect of the invention, the display device is arranged to display the recorded or modified image of the user on a screen or in space, in particular in the form of a hologram.

[0033] According to one aspect of the invention, the display device is arranged to display first the recorded image and then the image modified by the control unit during the exercise, in particular in a progressive manner.

[0034] According to one aspect of the invention, the display device is arranged to simultaneously display the recorded image or the modified image and the information to assist in completing the exercise.

[0035] According to one aspect of the invention, the information to aid in completing the exercise may be a representation of a part of the user's body, including a representation of his lungs during the exercise, a representation of the air circulating in his airways during the exercise, for example in the form of a ball going up and down in his trachea, a representation of the circulation of his blood from the heart to his muscles, a representation of the steps of performing the exercise.

[0036] According to one aspect of the invention, the information that aids in completing the exercise can be the image, which is progressively modified during the exercise. Indeed, by visualizing themselves performing the exercise, the user will be in a better position to complete it.

[0037] By visualizing a representation of himself performing the exercise, the user can thus perform the exercise more effectively. Indeed, the invention uses the principle of mirror neurons, which allow neurons to activate when the individual performs or sees an action—in this case, the breathing exercise—and the activation of these neurons aims to improve learning and therefore the efficiency of the exercise. Thus, by seeing himself perform the exercise and seeing an artificially modified image of himself showing that the exercise is working well, the user will see his physiological state improve more rapidly.

[0038] According to one aspect of the invention, the control unit is arranged to calculate: - A state change score, - A performance score for the exercise.

[0039] According to one aspect of the invention, the control unit is arranged to calculate the state change score based on the measurement provided by said at least one sensor throughout the exercise.

[0040] Alternatively, the control unit is arranged to calculate the state change score only at the end of the exercise based on the measurement provided at the beginning of the exercise and at the end of the exercise.

[0041] According to one aspect of the invention, the display device is arranged to display the state change score calculated by the control unit.

[0042] By state change score, we mean here a score representative of the evolution of the user's physiological state. For example, the state change score may represent the transition from a physiological state inferred before the exercise, corresponding to a state of fatigue or stress, to a state of calm alertness, in other words, a rested and calm state. According to one aspect of the invention, the display device is arranged to display the exercise performance score.

[0043] By exercise performance score, it is understood here to be a score representative of the user's ability to perform the exercise well.

[0044] According to one aspect of the invention, the control unit is arranged to, at the end of the exercise, display the image of the user recorded by the camera at the end of the exercise.

[0045] In this way, the user can see the effect that the exercise has had on him.

[0046] The present invention also relates to a vehicle, in particular a motor vehicle, comprising the system described above.

[0047] The present invention also relates to a driving assistance method enabling a user to reach a target physiological state comprising the following steps: - measurement of at least one physiological sign related to the user by a sensor, - recording an image of the user using a camera, - deduction of a physiological state from the measurement of the physiological sign by a control unit, - display of the recorded image and information to help complete an exercise by a display device.

[0048] The method according to the invention helps the user to achieve a state of calm alertness, a state which will allow him to have safer and more serene driving.

[0049] According to one aspect of the invention, the driving assistance method is implemented in a system as described above.

[0050] According to one aspect of the invention, the method includes a step of displaying by the display device the physiological measurement measured by the sensor.

[0051] According to one aspect of the invention, the method includes a step of proposing an exercise to the user by the system based on his inferred physiological state and the target physiological state, in particular a cardiac coherence exercise.

[0052] According to one aspect of the invention, at least one physiological sign is measured by the sensor continuously throughout the duration of the exercise.

[0053] According to one aspect of the invention, at least one physiological sign is measured by the sensor in real time throughout the duration of the exercise.

[0054] According to one aspect of the invention, the physiological sign is a physiological sign having a measurable frequency, for example a heart rate or a respiratory rate.

[0055] According to one aspect of the invention, the method comprises a step of measuring a user's respiratory rate and a step of measuring a user's heart rate, the two measurement steps being preferably carried out simultaneously, preferably by different sensors.

[0056] According to one aspect of the invention, the method includes a step of verification by the controlled unit of the user's ability to be in cardiac coherence.

[0057] According to one aspect of the invention, the verification step consists of verifying that the respiratory rate is between 0.06 and 0.12 Hertz, preferably approximately 0.1 Hertz, and / or that the heart rate is correlated with the respiratory rate. Indeed, when we perform a heart coherence exercise, we adopt a breathing rate of six cycles per minute. At this rate, the heart synchronizes with the respiratory cycles, and the respiratory rate has a value of approximately 0.1 Hertz.

[0058] According to one aspect of the invention, the method comprises a step of modifying the recorded image by the control unit, and a step of displaying said modified image by the display device. For example, the modified image may be a three-dimensional representation of the user or a part of their body, in particular their face. For example, the modified image is an avatar of the user.

[0059] According to one aspect of the invention, during the process, the image recorded by the camera in real time is first displayed by the display device before the start of the exercise, then the image artificially modified during the exercise is displayed, then again the image recorded by the camera in real time at the end of the exercise is displayed.

[0060] According to one aspect of the invention, the recorded or modified image of the user is displayed on a screen or in space, in particular in the form of a hologram.

[0061] According to one aspect of the invention, the method includes a step of comparing the measurement of the physiological sign provided by the sensor to a data representative of a state of fatigue of the user, in particular active fatigue or passive fatigue, and then proposing to the user to perform an exercise according to the result of this comparison.

[0062] Alternatively, the method includes a step of comparing the physiological sign measurement provided by the sensor to data representative of the target physiological state to be achieved, in particular a state of calm alertness, and then suggesting to the user that they perform an exercise based on the result of this comparison. Thus, as long as the physiological sign measurement provided by the sensor does not correspond to the data representative of the target physiological state, the system is configured to suggest to the user that they perform an exercise.

[0063] The exercise may, for example, be a breathing exercise, in particular a cardiac coherence exercise which consists of doing six breathing cycles for five minutes.

[0064] According to one aspect of the invention, the recorded image is progressively modified throughout the exercise until an image is obtained representing the user as he or she might be at the end of the exercise period, in other words, an image of the user rested and relaxed.

[0065] According to one aspect of the invention, the recorded image is modified throughout the exercise according to the measurement provided by the sensor or the evolution of the physiological state in a progressive manner.

[0066] According to one aspect of the invention, the control unit is arranged to modify the recorded image progressively throughout the exercise according to the evolution of its physiological state.

[0067] In other words, the control unit is arranged to progressively modify the recorded image so as to display a representation of the user who is increasingly relaxed and rested as the measurement provided improves during exercise.

[0068] According to one aspect of the invention, during the process, the image recorded and then the image modified by the control unit during the exercise are displayed by the display device, in particular in a progressive manner.

[0069] According to one aspect of the invention, the recorded image or the modified image and the information to help complete the exercise are displayed simultaneously by the display device.

[0070] According to one aspect of the invention, the information to aid in performing the exercise can be a representation of a part of the user's body, in particular a representation of his lungs, during the performance of the exercise, a representation of the air circulating in his airways during the performance of the exercise for example in the form of a ball that goes up and down in his trachea, a representation of the circulation of his blood from the heart and going to irrigate his muscles, a representation of the steps of performing the exercise.

[0071] According to one aspect of the invention, the method includes a calculation step by the control unit: - A state change score, - A performance score for the exercise.

[0072] According to one aspect of the invention, the state change score is calculated based on the measurement provided by said at least one sensor.

[0073] Alternatively, the control unit calculates the state change score only at the end of the exercise.

[0074] According to one aspect of the invention, the display device displays the state change score calculated by the control unit.

[0075] By state change score, we mean here a score representative of the evolution of the user's physiological state. For example, the state change score may represent the transition from a physiological state inferred before the exercise, corresponding to a state of fatigue or stress, to a state of calm alertness. In other words, a rested and calm state. According to one aspect of the invention, the display device is arranged to display the exercise performance score.

[0076] By exercise performance score, it is understood here to be a score representative of the user's ability to perform the exercise well.

[0077] According to one aspect of the invention, the display device displays the exercise performance score calculated by the control unit at the end of the exercise.

[0078] According to one aspect of the invention, at the end of the exercise, the display device shows the image of the user recorded by the camera at the end of the exercise.

[0079] Other features and advantages of the present invention will become more apparent upon reading the following description, provided by way of illustration and not limitation, and the accompanying drawings in which:

[0080] [Fig.1] Fig.1 is a schematic representation of a motor vehicle comprising an interactive system with at least one user occupying a vehicle according to the invention;

[0081] [Fig.2] The [Fig.2] is a schematic representation of the system according to the invention;

[0082] [Fig. 3] [Fig. 3] is a representation of a user's heart rate in a physiological state of stress and during a heart coherence exercise.

[0083] Figure 1 represents a motor vehicle 100 comprising a passenger compartment 9 in which a user P is seated to drive. The vehicle 100 is, for example, an autonomous or semi-autonomous vehicle. Thus, the user P in the vehicle experiences phases of manual driving and phases of autonomous driving. The user P may be subject to stress during a manual driving phase or to passive fatigue during an autonomous driving phase. In both cases, the driver may experience a decrease in alertness, and it is necessary to bring them to a target physiological state of calm alertness. For this purpose, the vehicle includes an interactive system 1 with the user P occupying the vehicle, preferably the driver, said system comprising: - At least one sensor 7 arranged to provide a measurement of at least one physiological sign relevant to the user, - At least one camera 2 arranged to record at least one image of the user, - A control unit 3 configured to deduce at least one physiological state of the user from the measurement of said physiological sign, - A display device 8 arranged to display the recorded image and information to help complete an exercise.

[0084] In this example, the camera is located on the dashboard 5 of the vehicle. It could be located anywhere in the vehicle that allows it to record at least one image of the user's face.

[0085] In this example, the sensor 7 for measuring at least one physiological sign is located on the ceiling 4 of the motor vehicle 100. The sensor 7 is therefore a non-contact sensor. The sensor could be located anywhere in the vehicle allowing it to measure at least one physiological sign related to the user, either without contact or with contact with said user. For example, it could be located on the steering wheel of the vehicle.

[0086] Figure 2 describes system 1 according to the invention in more detail. As stated previously, system 1 comprises: - At least one sensor 7 arranged to provide a measurement of at least one physiological sign 10 relevant to the user, - At least one camera 2 arranged to record at least one image 12 of the user, - A control unit 3 configured to deduce, from the measurement of said physiological sign 10, at least one physiological state 11 of the user, - A display device 8 arranged to display the recorded image 18 and at least one piece of information to assist in completing an exercise 15, 19.

[0087] The system allows the user to become aware of his condition by seeing himself as he is before starting an exercise by seeing the recorded image, and helps him to perform an exercise to relax him and bring him to a state of calm alertness.

[0088] The system includes, for example, two sensors, one arranged to provide a measurement of the user's heart rate, and the other sensor arranged to provide a measurement of the user's respiratory rate.

[0089] According to one aspect of the invention, the display device is arranged to display a measurement of at least one physiological sign (displayed physiological measurement 17). For example, the display device is arranged to display a heart rate measurement. Thus, the physiological measurement 17 displayed by the display device 8 can be a real-time tachogram. The tachogram corresponds to the curve that displays the variability of the heart rate (expressed in beats per minute, Bpm) as a function of time.

[0090] The user can thus become aware of his physiological state, in particular his state of stress or his state of fatigue.

[0091] The sensor is arranged to provide physiological sign measurements throughout exercise continuously and in real time.

[0092] As previously stated, this sensor 7 may be a non-contact sensor or may require contact with the user to provide the measurement of the physiological sign 10. This may be the case in particular for sensors arranged on the steering wheel and intended to come into contact with the user's hands.

[0093] The control unit 3 deduces a physiological state 11 of the user based on the measurement(s) of physiological signs 10 carried out by the sensor 7.

[0094] The control unit 3 is arranged to compare the measurement of the physiological sign 10 provided by the sensor with a data point 20 representative of the target physiological state 13 to be achieved, in particular a state of calm alertness, and to suggest to the user that they perform an exercise based on the result of this comparison. Thus, as long as the measurement of the physiological sign 10 provided by the sensor does not correspond to the data point 20 representing the target physiological state, the display device is arranged to display information to assist in performing an exercise 15, 19.

[0095] Based on this inferred physiological state 11, the system 1 is configured to offer the user an exercise, such as a heart coherence exercise, so that the user reaches a target physiological state of calm alertness. The display device 8 is thus configured to display information to assist in the completion of an exercise 15, 19, based on the inferred physiological state 11 and, more specifically, based on the comparison made between the physiological measurement 10 and the representative data 20 of the target physiological state 13.

[0096] The physiological state of calm alertness is notably reached when the user enters cardiac coherence, that is to say that his heart rate and respiratory rate are correlated and that the respiratory rate has a frequency between 0.06 hertz and 0.12 hertz.

[0097] To determine whether the user reaches or approaches the target physiological state 13, the control unit 3 is configured to verify whether the user reaches the target physiological state 13. In other words, the control unit is configured to verify the user's ability to achieve cardiac coherence. To this end, the control unit is configured to verify that the respiratory rate is between 0.06 and 0.12 Hertz, preferably around 0.1 Hertz, and / or that the heart rate is correlated with the respiratory rate. Indeed, when we perform a cardiac coherence exercise, we adopt a breathing rate of six cycles per minute. At this rate, the heart synchronizes with the respiratory cycles, and the respiratory rate has a value of approximately 0.1 Hertz.

[0098] The control unit 3 is also arranged to progressively modify the recorded image 13 throughout the exercise to obtain a progressively modified image 16 throughout the exercise, until an image is obtained representing the user as they might be at the end of the exercise period, in other words, an image of the user rested and relaxed in a state of calm alertness. The image can be modified according to the physiological state 11 inferred from at least one of the physiological sign measurements. The modified image 16 can also be a representation of the user, in particular via an avatar, and thus of their state, during the exercise.

[0099] The display device 8 is then arranged to display the image, which changes progressively during the exercise (modified image displayed 19). The user will then see themselves performing the exercise and will see the evolution of their physiological state towards a target physiological state of calm alertness.

[0100] The display device 8 is, for example, arranged to display the image recorded 12 by the camera 2 before the start of the exercise (recorded image displayed 18), then the image 16 artificially modified during the exercise (modified image displayed 19), and then again the image recorded 12 by the camera at the end of the exercise (recorded image displayed 18). Thus, the user can see themselves as they are before the exercise, see a representation of the evolution of their state during the exercise, and see themselves as they are after the exercise to see the effect that the exercise had on them.

[0101] Displaying the modified image during the exercise is an example of information to help complete an exercise: by seeing himself doing the exercise, the user will be in a better position to complete it.

[0102] The display device 8 is arranged to display the recorded or modified image of the user on a screen or in space, in particular in the form of a hologram.

[0103] The display device 8 can be arranged to simultaneously display the recorded image 18 or the modified image 19 and exercise assistance information 15. The exercise assistance information can be a representation of a part of the user's body, in particular a representation of their lungs, during the exercise, a representation of the air circulating in their airways during the exercise, for example in the form of a ball going up and down in their trachea, a representation of the circulation of their blood from the heart to their muscles, a representation of the steps of performing the exercise.The information to assist in completing the exercise can also be the modified image 19 by the control unit which allows the user to see a representation of himself performing the exercise and to visualize the effects that the exercise may have on him.

[0104] By visualizing a representation of himself performing the exercise, the user can thus perform the exercise more effectively. Indeed, the invention uses the principle of mirror neurons, which allow neurons to activate when the individual performs or sees an action, in this case, the breathing exercise, and the activation of these neurons aims to improve learning and therefore the efficiency of the exercise. Thus, by seeing himself perform the exercise, and by seeing an artificially modified image of himself according to which the exercise

[0105]

[0106]

[0107] If it works well, the user will see their physiological condition improve more rapidly. Control unit 2 is configured to calculate: - A state change score based on the measurement provided by at least one sensor throughout the exercise, or at the beginning and end of the exercise, - A performance score for the exercise. The display device is arranged to show the state change score and the exercise performance score. Figure 3 represents a tachogram of a user in a state of stress (3B) and in a state of cardiac coherence, for example, in a state of calm alertness (3A). As can be seen, the user's heart rate is erratic in a state of stress, whereas at the end of the exercise, the heart rate is regular. Displaying this measurement on the display device throughout the exercise allows the user to visualize their change in state.

Claims

Demands

1. An interactive system (1) with at least one user occupying a vehicle, in particular a car, said system comprising: - At least one sensor (7) arranged to provide a measurement of at least one physiological sign (10), in particular a heart rate and / or respiratory rate relative to the user, - At least one camera (2) arranged to record at least one image (12) of the user, - A control unit (3) configured to, from the measurement of said physiological sign (10): • deduce at least one physiological state (11) of the user, • compare the measurement of the physiological sign (10) provided by the sensor (7) to: • a representative data point (20) of the target physiological state (13) to be achieved, in particular a state of calm alertness, or • a representative data point of a state of fatigue of the user, in particular active fatigue or passive fatigue,and • to offer the user an exercise based on the result of this comparison, - A display device (8) arranged to display the recorded image (18) and information to help complete an exercise (15, 19).

2. Interactive system (1) according to claim 1, characterized in that the display device (8) is arranged to display the measurement of at least one physiological sign (17), for example of a heart rate or respiratory rate.

3. Interactive system (1) according to claim 1 or 2, characterized in that it is arranged to offer an exercise to the user, in particular a breathing exercise and more specifically a cardiac coherence exercise, according to his physiological state deduced until he reaches a target physiological state.

4. Interactive system (1) according to the preceding claim, characterized in that the control unit (3) is arranged to check if The user reaches the target physiological state (13), in particular by verifying that the respiratory rate is between 0.06 and 0.12 Hertz, preferably is about 0.1 Hertz and / or that the heart rate is correlated with the respiratory rate.

5. Interactive system (1) according to any one of the preceding claims, characterized in that the control unit (3) is arranged to modify the recorded image (12) progressively, in particular as a function of the physiological state inferred (11) by the control unit (3), throughout the exercise to obtain a progressively modified image (16) throughout the exercise.

6. An interactive system (1) according to any one of the preceding claims, characterized in that the display device (8) is arranged to display the image recorded (18) by the camera before the start of the exercise, then an image (19) artificially modified during the exercise, and then again the image recorded (18) by the camera at the end of the exercise

7. Interactive system (1) according to any one of the preceding claims, characterized in that the control unit (3) is arranged to calculate a state change score and an exercise performance score, and the display device (8) is arranged to display said scores.

8. Vehicle (100), in particular a motor vehicle, comprising the system (1) according to any one of the preceding claims.

9. A driving assistance method enabling a user to reach a target physiological state comprising the following steps: - measurement of at least one physiological sign relating to the user by a sensor, - recording of an image of the user by a camera, - deduction of a physiological state from the measurement of the physiological sign by a control unit, - comparison of the measurement of the physiological sign provided by the sensor to: • data representative of a state of fatigue of the user, in particular active fatigue or passive fatigue, • data representative of the user's state of fatigue, including active or passive fatigue, and proposing that the user complete an exercise based on the result of this comparison, and display of the recorded image and information to help complete an exercise by a display device.