preTrialSignal attribute

Member of

<trial> <likert> <openended> <sliderTrial>

Syntax

/ preTrialSignal = (modality, signal)

or

/ preTrialSignal = (mouse, stimulusname)

or

/ preTrialSignal = (mouse, mouseevent)

Parameters

Name	Type	Description
modality	signaltypeenum	Value Description com Serial port input. keyboard Keyboard input. lpt Parallel port input. mouse Mouse input. xid Input from a Cedrus device.
signal	integer	An integer representing the numeric signal to wait for. If the modality is keyboard, this is the scancode of the key.
mouseevent	mouseeventenum	Value Description dragDrop Dragging and dropping a stimulus lButtonDblClk Left button double-click. lButtonDown Left button press. lButtonUp Left button release. mButtonDblClk Middle button double-click. mButtonDown Middle button press. mButtonUp Middle button release. mouseMove Moving the mouse mouseWheel Moving the mouse wheel rButtonDblClk Right button double-click. rButtonDown Right button press. rButtonUp Right button release. xButton1DblClk xButton1Down xButton1Up xButton2DblClk xButton2Down xButton2Up xButtonNDblClk xButtonNDown xButtonNUp
stimulusname	stimulus	The name of a visual stimulus element defined elsewhere in the script.

Remarks

This is useful for requiring a confirmation response from subjects before starting a trial, or for synchronizing Inquisit with an external device such as an EEG.

Examples

The following trial waits for a parallel port signal of value 1 sent from an fMRI imaging system before starting the trial:

<trial target>
/ stimulusTimes = [0=facepicture]
/ validResponse = (57)
/ pretrialsignal = (LPT1, 1)
</trial>

The following trial requires the subject to press the spacebar to start the trial:

<trial myTrial>
/ stimulusTimes = [0=myText]
/ validResponse = (57)
/ pretrialsignal = (keyboard, 57)
</trial>