Black Box IEEE 1284 Betriebsanweisung PDF herunterladen (Seite 52)

Page 52 of 98 The Black Box Toolkit

In the case of the simple visual reaction time paradigm we are about to test we only need

create one simulated response. That is, the active switch closure event that will simulate a

human pressing the left mouse button. To do this we select “on” for line 7 in the upper

sheet and enter a duration of 150ms. This means that we have created a response event

on line 7 that simulates pressing the left mouse button and holding it down for 150ms.

Once we are happy with the response event we click on the “Append Row” button to enter

it into the bank.

If we need to edit any of the response events in the bank select the row concerned and

make use of the “Insert”, “Replace” and “Delete” row buttons. Once we are happy with the

response bank we save it.

The next stage in the process is to define one or more “Stimulus Pattern Matches”. These

are patterns of event(s) that must occur on the remote PC in order to be responded to in a

predefined way. You should think carefully about sequencing as DSCAR responds to

events in sequence by looking at the current “Stimulus Pattern Match” event. So it will start

to look for a pattern that matches the first SPM, if it detects one DSCAR will respond and

then move on to start looking for the second SPM event and so on. If an event match is

not detected the list of SPM events will not be progressed through as intended. This

means you need to think about the sequence in which a real human would have to

respond and then define the events accordingly.

Here we are defining that we need to watch for an SPM on line 3 (the opto-detector). To

accept this as a SPM to watch for we click on the “Add SPM PV” button. Next we need to

enter the “Delay”. This is the elapsed time we want to wait after detecting the matching

stimulus before generating a simulated response from the response bank we defined

earlier. In this case we want a delay of 300ms which corresponds to the average response

time of a real human in this type of experiment.

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Black Box IEEE 1284 Betriebsanweisung Seite 52