
Page 36 of 98 The Black Box Toolkit
Copyright © 2004 The Black Box Toolkit Ltd. All rights reserved.
Setup:
• An opto-detector is fixed to the centre of the screen on the remote PC. A 32x32
pixel white block has been superimposed in the centre of each bitmap to aid
detection (line 3)
• A BBTK Digital Microphone is placed next to the relevant speaker (line 1) –
sensitivity should be adjusted so that a sound just triggers the microphone and
causes the LED activity light to illuminate
Once DSC has started by selecting “Tools|Options” we can set the sample time limit to
30,000ms (30 seconds). Then we choose a filename. Finally we click on the run button. At
this point we are presented with a “press space to start” dialog box. The paradigm is
started on the remote PC and is left at the instruction screen. Next space is pressed on the
BBTK host PC and then immediately after the start key, e.g. space is pressed on the
remote PC running the paradigm. To move on to the next trial we manually press the ‘b’
key on the remote keyboard to register a response. This is done after the tone has been
fully played. Note the keyboard needs to be far enough away from the BBTK microphone
so as not to activated by mistake with a key click sound. Once 30 seconds has elapsed the
DSC will display summary statistics showing details about the sample rate and data file
size etc.
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