In practice, this tool measures the speed at which an individual reacts to the appearance of a simple image on a screen with instructions to react only to certain images. It thus makes it possible to measure the speed of information processing, attention, executive functions and reaction to difficulty

The severity of the depression will be assessed using the MADRS score. Montgomery-Asberg Depression Scale (MADRS) The scale has 10 items rated from 0 to 6.

0 to 6 points: the patient is considered healthy. 7 to 19 points: the patient is considered to be in mild depression. 20 to 34 points: the patient is considered to be in moderate depression. > 34 points: the patient is considered to be in severe depression.

The "simple reaction time" (SRT) is the reaction time to the first test (the subject releases the mouse click as quickly as possible when an image appears) , it contains the time needed to perceive and analyse the image, to formulate the response and to execute the motor response.

reaction time with a categorisation where the subject must react or not react (Go/NoGo) according to the categorical target, in this case a light or dark colour (white coloured image or grey coloured image).

The ES Score corresponds to the Executive Speed, i.e. the average time of categorisation of the subject.

It corresponds to the adaptation of the subject to the level of difficulty. The shift of the circle above the blue rectangle indicates a higher than expected slowing down in reaction to the difficulty of the instruction, while a shift below the blue rectangle indicates that the participant is not slowing down enough in response to the difficulty and is at risk of making mistakes.

measured by a self-questionnaire : State Trait Anxiety Inventory (STAI) 40 items rated from 1 to 4

Measured by a scale : Transdiagnostic Skills Scale (T2S) 42 items rated from 1 to 7