Establishing Visual Cortex Phosphene Thresholds
Corresponding Organization : National Yang Ming Chiao Tung University
Other organizations : RIKEN Center for Brain Science, Providence College, Brown University
Variable analysis
- Stimulation site (defined in the upper quadrant of the visual field)
- Phosphene threshold (PT): Minimal stimulation output intensity to induce a 50% chance of reporting phosphenes
- Coil type: 70-mm air-cooled figure-eight coil for active TMS and D70 Alpha Flat Coil for sham intervention
- Stimulator: Magstim Rapid^2 stimulator
- Coil placement: Coil fixed over the predefined target, placed tangentially to the skull, parallel to the O1-Oz-O2 (10–20 international system) line with the handle pointing outwards
- Participant instructions: Adapted to the dark environment, instructed to not expect visual change, to keep their eyes open, to maintain visual fixation on the central spot, and to report the presence or absence of a phosphene after each TMS pulse
- Participant familiarization: Participants were familiarized with the TMS procedure and phosphene perception and ran at least one threshold estimation before the beginning of the experiment
- Active TMS stimulation using the 70-mm air-cooled figure-eight coil
- Sham intervention using the D70 Alpha Flat Coil
Annotations
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