Black Box IEEE 1284 Guia do Utilizador descarregar pdf (Página 42)

Page 42 of 98 The Black Box Toolkit

Here we have taken the response time from the start of the visual presentation on line 3 to

the leading edge of the response pad button on line 7. The resulting response time is

1,643ms (M).

We can also measure how long the button was held down for, in this case 302ms (M).

8.3. Event generator (EG)

The Event Generator module can be thought of as an advanced four channel digital signal

generator. Events on any line can be varied at will in terms of onset and duration. Lines

can be used independently or together as a group. Up to 32,000 events can be

programmed on each line. Typically the two powered-out lines are used for generating

tones using the BBTK Digital Tone Generators [optional extra] and the two further lines are

used for active switch closure.

The Event Generator can be used to trigger response devices on the remote PC as though

a human had pressed a button or activated a voice key. This allows you to check response

times and durations for both button down and auditory responses. Alternatively EG can be

used to simulate a regular pulse, e.g. the synch pulse from an fMRI scanner. This latter

application allows you to check your paradigm as if physically linked to the real hardware.

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Black Box IEEE 1284 Guia do Utilizador Página 42