Black Box IEEE 1284 Guia do Utilizador descarregar pdf (Página 48)

Page 48 of 98 The Black Box Toolkit

When we analyse the RTL with the Data Analyser we can see the 1ms wide pulses were

generated every 1993ms as indicated by the measurement cursors. By comparing sync

times and pulse widths recorded by the remote PC we can evaluate its accuracy when

syncing it with an fMRI scanner.

8.3.3. Tutorial 3: Using two BBTKs to simulate an fMRI scanners operation

By making use of two BBTKs one could be used to simulate an fMRI scanners sync pulse

with the second being used to check the timing of the remote PC hardware and software

paradigm. Typically you would do this by utilising the DSC software module together with a

BBTK response pad.

Line 8 from the first BBTK would be split and connected to the parallel port or specialist

board of the remote PC to simulate the scanner sync pulse. The second split would be

connected into line 1 (Powered-In) of the second BBTK. A BBTK Digital Microphone could

be connected to line 2 on the second BBTK. A single opto-detector could be connected to

line 3 on the second BBTK. Remember a second opto-detector remains free on line 4

should we wish to check RSVP stimulus materials alongside audio. Finally the BBTK

response pad is connected to the custom 9-way port on the rear of the BBTK. An active

switch closure flying lead from the appropriate button of the response pad could then be

connected to the response device on the remote PC.

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Black Box IEEE 1284 Guia do Utilizador Página 48