Trial Commands

Trial commands are used to define a trial. A trial consists of a fixed sequence of atomic events. Each event is defined by one of the following trial commands:

Visual Presentation:

CS Clear Screen

SP Show Picture

LV Load Video

PV Play Video

Screen Operators:

+ Add Picture

& Concatenate Picture

Pre-loading screen images:

LI Load off-screen image

TI Transfer off-screen image

SI Save off-screen image

Auditory Presentation:

ST Start tone

CT Clear tone

WT Wait for Tone

Response Registration:

RK Record Key Press

WK Wait for Key

GR Generate Response

TL Tap on Locations

TP Tap on Pictures

VK Activate Voicekey

Response dependent action:

FB Feedback (Response classification and feedback)

OK Actions based on what key has been pressed

ET End running trial or block

GT Repeat trial or jump to another trial within current block

GL Abort block and jump to session label

VAS and Likert Scales:

DS Define Scale

SS Show Scale

GS Get Scale Rating

Nested Trial Execution:

RT Run Trial Definition

IT Include Trial Definition

SW Single Word Presentation

Visual Presentation with Integrated Random Mechanisms:

FP Fill Positions

LP Load Position

MP Mix Position Indices

RP Reset Position

KP Keep Positions

Set Operations:

DE Draw Element from Set

GE Get element from set

IS Initialize Set

RE Remove Element

Update Data Objects:

UC Update Color definition

UK Update Key definition

UP Update Position definition

UT Update Tone definition

AO Assigns content from one object with content from another object

PS Split Picture into Set

System related commands:

AP Align picture

SC Set standard fore- and background color

SE Set screen echo for key presses

SF Set font for text pictures

SO Set overlay

SR Set picture rotation angle

SV Set volume of auditory presentation

TS Test Speed

Most of the trial commands have many arguments. Some of them are optional and need not to be specified if the default setting is correct.