Overview

These are ECoG data from a visual grating viewing task, where a monkey viewed a screen that alternated between a visual grating of 8 different directions and a blank screen every 2 seconds.

Task

A monkey viewed a screen that alternated between a visual grating selected randomly from 8 different directions (45, 90, 135, 180, 225, 270, 315, 360 degrees) and a blank screen every 2 seconds.

Monkey was sitting with head fixed. His arm motion was also restrained. ECoG data and eye position were recorded. There was a monitor in front of the monkey. Grating pattern that moves in eight direction was presented on the screen. There was no fixation required. Blank and stimulus pattern were switched alternatively every 2 sec. Stimulus events can be decoded from 129th channel by analog value. ECoG data were sampled at 1KHz. One cycle of sinusoid pattern was 27mm with speed at 108mm/sec (4Hz). Distance between monkey and screen was 490mm.

Data

128 ECoG channels were recorded at 1000Hz and the positions of the electrodes are shown in K2.png.

Data are originally from http://neurotycho.org/visual-grating-task.