Black Box IEEE 1284 Betriebsanweisung PDF herunterladen (Seite 31)

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Depending on which schedule has been chosen a tone will be played and a white block

will appear over any active speakers. This gives you the opportunity to test both

microphones and opto-detectors simultaneously.

You may want to make use of the “Sensor Threshold Check” utility on the BBTK host PC

as previously outlined in relation to opto-detectors as its virtual LEDs will illuminate each

time a sound is detected. In addition to altering the physical positioning of the microphones

and tuning their trigger threshold you may also need to alter the volume of your own

speakers or headphones. Again the Digital Stimulus Capture software module can be used

to capture timing data related to the tones onset and duration.

7.3.3. Tutorial 3: Setting-up sensors for cross-modal stimulus materials

The sensor check utility can help you setup sensors ready to benchmark cross-modal

studies that make use of both visual and auditory stimulus materials.

Two images are displayed alternately with a black screen every 500ms. The onset of each

image is synchronised with a 500ms tone which should sound for the duration of the image

display. Again white blocks are displayed to help aid in opto-detector positioning. The

sequence will loop until stopped manually. To start the sequence, access the “Cross

Modal” menu. You are advised to use the “Sensor Threshold Check” on the BBTK host PC

as this will show activity on the four lines associated with visual and auditory activity. Again

the Digital Stimulus Capture software module can be used to capture timing data related to

the tones onset and duration characteristics.

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Black Box IEEE 1284 Betriebsanweisung Seite 31