Phosphenes are transient percepts of light that can be induced by applying Transcranial Magnetic Stimulation (TMS) to visually sensitive regions of cortex. We demonstrate a standard protocol for determining the phosphene threshold value and introduce a novel method for quantifying and analyzing perceived phosphenes.
In this video, we have demonstrated a standard protocol for obtaining a phosphene threshold value and introduced a novel method for recording phosphene size and visual field location. Phosphenes were elicited by delivering individual pulses of TMS to the right occipital cortex adjacent to the occipital pole. Phosphene threshold values provide a valuable indication of relative cortical excitability; and have been used both as an outcome measure and as a means of determining the appropriate intensity of TMS in variety of s…
Material Name | Typ | Company | Catalogue Number | Comment |
---|---|---|---|---|
TMS | Magstim | Magstim 200 | ||
Webcam | Logitech | QuickCam Orbit MP | ||
Projector | Epson | Epson PowerLite 7900p | ||
Projection Screen | DA LITE | Da-View fast-fold deluxe screen | ||
Laser Pointer | Generic |