Session Definition

For the definition of a session ERTS offers a special group of commands. These session commands are described in a separate chapter.

 Example for a session definition

; This trial is used for displaying instructions
TRIAL Prompt
SP ? MidPos          ; Show variable picture
WK -          ; Wait for any key

; This trial definition is used to realize pauses between blocks
TRIAL Pause
CS 20000          ; Clear screen and wait for 20 s

This trial definition displays a variable stimulus
TRIAL Trl
CS 1000          ; Clear screen and wait for 1000 ms
RK ResKeys 2000          ; Record Response, MaxRt = 2000 ms
SP ? MidPos 1 0 1          ; Show variable stimulus until response or MaxRt
FB ?          ; Compare response with correct key

; Choice reaction task: Press left if you see a Square, press right if you see a Circle
BLOCK Blk 2
1 Trl Square SHL
1 Trl Circle SHR

SESSION Choice reaction task (square=left / circle=right)
RUNTRIAL Prompt Start          ; Show instruction
RUNBLOCK Blk 40 4          ; Run 40 valid trials, 4 warm-up trials
RUNTRIAL Pause          ; Pause for 20 s
RUNTRIAL Prompt Start          ; Show instruction
RUNBLOCK Blk 40 4          ; Run 40 valid trials, 4 warm-up trials
RUNTRIAL Prompt Thanks          ; Show Thank You