Inquisit to trigger TMS

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Inquisit to trigger TMS

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snikolin	snikolin posted 5 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 1, Visits: 2	Hi, I'd like to trigger a transcranial magnetic stimulation (TMS) device using an Inquisit TTL signal. I've successfully used a variant of the below code to send signals to an EEG amplifier (TMSi Polybench). Unfortunately, I haven't had any luck so far with the TMS trigger. The TMS device requires the following inputs: TMS MagPro Trigger Input DSUB 9 pin Female Pin 1: Trigger Input Pin 2: Trigger Output Pin 3: Ground. (Reference) Pulse width > 5µs TTL + CMOS levels accepted Input Impedance > 10 kΩ Default: Falling edge/Rising edge (user defined) My Inquisit script attempt (relevant sections only): <port triggersignal> / port = LPT1 / subport = data / items = ("11111111") / erase = ("00000000") </port> <trial test> / stimulustimes = [0=start; 1000 = trigger, triggersignal] / validresponse = (noresponse) / trialduration = 5000 / recorddata = false </trial> Any help would be very much appreciated! Tags TMS trigger TTL signal
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Dave	Dave posted 5 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 103K	+x snikolin - Tuesday, March 5, 2019 Hi, I'd like to trigger a transcranial magnetic stimulation (TMS) device using an Inquisit TTL signal. I've successfully used a variant of the below code to send signals to an EEG amplifier (TMSi Polybench). Unfortunately, I haven't had any luck so far with the TMS trigger. The TMS device requires the following inputs: TMS MagPro Trigger Input DSUB 9 pin Female Pin 1: Trigger Input Pin 2: Trigger Output Pin 3: Ground. (Reference) Pulse width > 5µs TTL + CMOS levels accepted Input Impedance > 10 kΩ Default: Falling edge/Rising edge (user defined) My Inquisit script attempt (relevant sections only): <port triggersignal> / port = LPT1 / subport = data / items = ("11111111") / erase = ("00000000") </port> <trial test> / stimulustimes = [0=start; 1000 = trigger, triggersignal] / validresponse = (noresponse) / trialduration = 5000 / recorddata = false </trial> Any help would be very much appreciated! I can't really find sufficient documentation for the MagPro. Based on the little that's there, you can either try connecting your computer's serial port (COM, not LPT) to the MagPro's trigger input port, or you need to use the parallel port with a suitable adapter cable. The specs you posted read like the system is expecting a pulse on a single line on its DSUB connector. You need may need an adapter that connects your computer's parallel port to the input pin (#1) on MagPro's DSUB connector. Then you can raise and lower signal on the parallel port's corresponding pin as needed to send a pulse on that line. I.e. something like this: <trial test> / stimulustimes = [0=start; 1000 = trigger, raisesignal; 1050=lowersignal] / validresponse = (noresponse) / trialduration = 5000 / recorddata = false </trial> <port raisesignal> / port = LPT1 / subport = data / items = ("00000001") / erase =false </port> <port lowersignal> / port = LPT1 / subport = data / items = ("00000000") / erase =false </port> However, as I said, the documentation available is a bit lacking, so take the above with a grain of salt and consult with your local technician before wiring things up.
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