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10. USING THE BBTK RESPONSE PAD

The Black Box Toolkit response pad [optional extra] offers researchers a guaranteed

method for collecting sub-millisecond accurate presentation and response times. This can

be particularly important when collecting data from paradigms involving presentation of

video or other complex stimuli involving rapid presentation rates. Typically the response

pad is used with the Digital Stimulus Capture software module.

The response pad can be useful in several scenarios:

1. The response pad can collect response data from a live paradigm where timing is

so critical that the paradigm itself is deemed unreliable, e.g. video or RSVP. Simply

the Toolkit records both presentation and response timing. Using the measurement

cursors of the Data Analyser you are free to choose the stimulus onset point and

use the second cursor to read off a response time. For more details of using the

response pad with video based stimuli consult the “Sensor Calibration” section of

the manual.

2. The response pad can also be used to check the timing of a paradigm rather than

using DSCAR as a virtual human. In this way a human can make responses to

stimuli using the pad and by utilising the active switch closure leads from the pad a

standard response device can be simultaneously triggered. By comparing the exact

response time recorded by DSC against that recorded by the paradigm any timing

errors can be computed as normal. Some researchers may prefer this option as this

gives them the option of using live human response times, but with the advantage

of a third party monitoring all display and response times with sub-millisecond

accuracy.

In the diagram below a response pad and microphone have been added to the simple

visual reaction time paradigm outlined in the previous section.

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Black Box IEEE 1284 Betriebsanweisung Seite 91