For electrical current stimulation, we use a Digitimer Constant Current Stimulator, model DS7A. It can be used at 3T, 7T, as well as the mock scanner.
Most important specifications:
- MDD CE certified and FDA cleared medical device
- Pulse durations from 50µs to 2ms
- 100mA constant current output from 400V
- Flexible TTL compatible trigger options or front panel push button
- Alternating Polarity control -- a toggle switch allows the stimulator to operate in +vin, -vin (red and white) or alternating polarities during stimulation
If you'd like to drive the stimulator with Matlab, make sure you initialise access to the driver with io64. Then assign the right address: address = hex2dec('AFE8'); %check address device manager, ports (COM &LP), LPT1 resources 1st entry io range and flip the bits, for example like this:
byte = 0;
outp(address,byte);
byte = 255;
outp(address,byte);
Here you can find an example script.
