Figure 1
From: Long-term use of a neural prosthesis in progressive paralysis
Experimental setting. SSVEP responses were recorded from a single electrode at Oz on each participant’s scalp. All participants laid on a bed, and each flickering LED was placed 60 cm from the participants’ eyes. LED frequencies of 32–54 Hz were applied. Before starting a session, we determined the PSD threshold and LED frequency. In each trial, following verbal instructions, the participants were required to attend to or ignore the flickering target LED for 30 seconds (attend/ignore task). The target LED was randomly assigned by the experimenters in each trial. The participants were instructed as follows: “Attend to the target LED” or “Ignore the target LED”. When the participants were asked to attend to the target LED, and the PSD exceeded the threshold for 4 seconds, we classified the response as a correct answer. When the instruction was to ignore the target LED, if the PSD remained below the threshold for 30 seconds, the response was classified as a correct answer. The participants completed the attend/ignore task trial 6 or 12 times in one session.
