2.0: Conditional Trigger Sample (Task Events)

Description

This sample illustrates the use of Task Events and multiple input masks to send conditional based events on the response.

Abstract

If you want to send a specific Attribute at each Stimulus.Response, you can reference it from a List object (e.g., TrialList). The .ACC data type will send a "1" or a "0". At this time, the Task Events feature cannot send conditional data. Since the “off” signal is the same as the default “incorrect response” signal (ACC=0), accuracy can be re-coded from [0,1] to [1,2]*.

To do this, we can create two Attributes in the TrialList called CorrectRESPTrigger and IncorrectRESPTrigger. For the Correct response, we will send a "2". For the incorrect response, we will send a "1". To send the appropriate trigger, we can add two input masks to the Stimlulus object. For the first input mask, we would put the Allowable as [Correct] and the Correct as [Correct]. Then for the Task Event Stimulus.Keyboard(1).Press, we would send [CorrectRESPTrigger]. For the second input mask, we would put [Incorrect]{F4} as the Allowable and {F4} as the Correct. Then for the Task Event Stimulus.Keyboard(2).Press, we would send [IncorrectRESPTrigger]. 

Note that you do not need to use F4. You can use any key that would not accidentally be pressed. I just added in that key to make sure that a "no response" would not be counted as correct for the Incorrect Keyboard Input Mask Device (i.e. leaving the Correct Response blank for the second Keyboard Input Mask).

Comments

Requires E-Prime 2.0 Professional build 2.0.10.182 or later

*If you wish to send conditional triggers in an earlier version of E-Prime 2.0 or in Standard, you will need to use InLine script.