Evaluation of Stroop Effect in Patients With Schizophrenia

First, participants will receive six categories of stimuli presented in a classical way: (1) incongruous stimulus classical (BLUE written in green for example); (2) associated incongruous stimuli (SKY written in green for example); (3) conventional congruent stimuli (BLUE written in blue for example); (4) associated congruent stimuli (SKY written in blue for example); (5) neutral words (BRIDGE written in green for example); And (6) neutral stimulus (XXXX written in green for example). In a second step (after a 5 minute break), they will receive these six categories of stimuli, but only half will be presented in a classic way and the other half will be presented in order to attract attention as in Augustinova and Ferrand 2007). To do this, in (1) incongruous stimuli classical like BLUE, a single letter (like B for example) will be colored in green for example and the rest of the word (LUE) will appear in gray); In (2) incongruous stimuli associated as SKY, only K for example will be green and the rest of the word will appear in gray); In (3) conventional congruent stimuli such as BLUE, only B for example will be written in blue and the rest of the word will appear in gray); In (4) associated congruent stimuli such as SKY only K for example will be written in blue and the rest of the word will appear in gray); In (5) neutral words like BRIDGE, only D will be colored in green for example and the rest of the word will appear in gray; And finally, in (6) neutral stimuli like XXXX, only one X will be colored in green for example and the rest of the X will appear in gray. The task will be to name the color of each word (by stating the color verbally) as quickly and correctly as possible, while ignoring the written word. In this experiment, we will measure the time taken to denominate the color (in milliseconds) as well as the percentages of incorrect answers. The first step allows to determine the stroop effect and the second the semantic conflict.