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In psychological experiments,
it’s a basic function to record the subject’s
response parameters such as response time and response
correction rate. Conducting similar psychological
experiments using fMRI also requires response recording.
Further more, in fMRI experiments, it’s important to
synchronize stimulation presentation and MRI scanning.
To record the response data, SAMRTEC provides a
key-pressing response device and a MRI compatible
optic-electrical keyboard. To realize synchronization of
stimulation presentation and MRI scanning, SAMRTEC
provides a feedback device to convert the MRI
synchronizing pulse to correspondent ACSII code and then
transfer the codes to the computer.
During MRI scanning, the scanner will periodically
transmit an electronic or optical pulse signal. This
pulse signal can then be converted to ASCII code by the
feedback device, and then transferred as input to
computer via USB. With stimulation control software such
as E-Prime, the ASCII code can be set as the
synchronization signal to trigger the stimulation
program with a delay less than 0.5ms.
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