KeyIndex

Selects a single key press within multiple key presses for comparison:

0 Compare all keys.

i>0 Compare only the i-th key press

 Examples for response dependent feedback using OK-command

; Key definition defining Cursor left and right as response keys

KEY ResKeys CL CR

; Trial definition for displaying the stimulus

TRIAL ShowItem
RK ResKeys          ; Prepare Response Registration
SP ? MidPos 1 2000          ; Show variable stimulus
OK           ; Compare single key press
CL: ST LowPeep          ; Play low beep in response to left cursor key
CL: SP Left FBpos 1 700          ; and show the word ‘left’
CR: ST HighPeep          ; Play high beep in response to right cursor key
CR: SP Right FBpos 2 700          ; and show the word ‘left’

CT ; Clear tone
CS 2500 ; Clear screen and wait for 2500 ms