Project: Anschutz (112 OPM sensors)
Subject: TM
Subject ID: AS30
Date: December 21, 2021
Paradigm: Entrainment

Entrainment Paradigm
Template: RHYTHM
frequency: 1000 Hz 
Three files: one just listening, one tapping to the beat, one self-paced tapping when cued (STOP tapping when single tone is heard)
Tested hearing threshold  frequency to compensate for both human hearing differences and (more importantly) variable frequency response of the delivery system 
Set the sound level a certain value (??? Which one) above the hearing threshold
30 beats an then a pause
Left ear
Right hand
ISI: 1 sec
5 minutes per frequency

Hearing threshold 1000 Hz: 38  dB
Volume level: 93 db SPL (for all thresholds greater than 28 dB)

Triggers
Channel 00:00        HPI
Channel 01:00        BNC 0 (box)
Channel 02:00        response button
Channel 03:00        BNC 1 (box)
Channel 04:00        BNC 2 (box)
Channel 05:00        Sensor localization (Tyler’s box)
Channel 06:00        BNC 3 (box)

Sensor positions
If a location is 00 for x, y, and z, it is a bad channel

Coregistration
Before and after measurement day
HPI coils 1-5, one measurement per file 
43 Hz sine wave
100  Ohm resistor
10 sec measured at two amplitudes: 0.05 V and 0.5V

Two Polhemus files:
Polhemus head shape measurement outside the helmet and inside the helmet
Five point Polhemus file has fiducially, HPI coils, and 5 points on the OPM helmet
	LPA, RPA, Nasion are the fiducials
	Cz, Inion are the coil positions taped to the eyebrow/temple region
	Coil1=LPA coil
	Coil2=RPA coil
	Coil3=Nasion coil
	Coil4=Cz coil around left eyebrow
	Coil5=Inion around right eyebrow
	OPM1-5 are the following reference points on the helmet
	OPM1=Point 1
	OPM2=Point 4
	OPM3=Point 2
	OPM4=Point 3
	OPM5=Point 5
The coordinates in the sensor frame are:

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