File:PremotorTheoryOfAttention Fig4.jpg

A) Individual saccade vectors obtained with suprathreshold stimulation at an FEF site in the monkey, illustrating how the motor field was mapped. Vector traces show eight saccades evoked in eight trials at a current of 38 mA. B) Illustration of the visual display viewed by the monkey. The monkey was trained to fixate on the central fixation spot and attend to a peripheral target that could transiently dim at a random time during the trial, in presence of visual distractors randomly flashed throughout the display. C) Staircase data and luminance change threshold estimates (% contrast) obtained with (black circles) and without (white circles) microstimulation (stimulation onset asynchrony=175 ms). Results showed that microstimulation improved monkey’s performance when, but only when, the object to be attended was positioned in the space represented by the cortical stimulation site (Moore & Fallah, 2001).