File:Figure2 BasicElectrophysiological highres.png

Summary

Figure 2. Basic electrophysiological features of the FEF. Left panel, hypothetical responses of some (but not all) types of FEF neurons during a memory-guided delayed saccade task. The sequence of events within this task is illustrated in the upper part of the panel. The monkey foveates the fixation point (small white circle), and a visual stimulus (white square) is transiently displayed shortly thereafter. The monkey continues to hold his gaze on the fixation point for a variable delay period. After the fixation point disappears, the monkey is free to execute a saccade (black arrow) to the remembered location of the visual target to earn a juice reward. The top two rows of the panel depict the screen contents during the visual stimulation, delay period, and saccade execution (from left to right, respectively). The top row shows an “inside-RF” trial in which the visual stimulus and saccade both in the receptive field (RF, indicated by dashed line) of the recorded FEF neuron. The second row of screens depicts an “outside-RF” trial in which the visual stimulus and saccade are away from the RF of the neuron. The lower part of the panel depicts the time course of trial events and the hypothetical recorded neuronal responses, aligned to stimulus onset time (left) and saccade onset (right). The inside-RF and outside-RF trials illustrated in the upper-half of the figure correspond respectively to the solid and dashed lines in the eye position and neural firing rate traces in the lower half of the figure. Separate bold black lines indicate the times when the fixation point or visual stimulus appears on the screen. Hypothetical eye position is shown for both inside- and outside-RF trial types as a solid or dashed black line, respectively. Several firing rate traces associated with inside-RF trials (colored lines) are displayed, corresponding to visuomotor (red), visual transient (blue), motor (orange), and motor with delay activity (green) neuron response types. Right panel, the results of electrical stimulation at a FEF site. As the monkey fixates, a brief (e.g. 50 ms) train of electrical stimulation pulses is applied via a microelectrode in the FEF. A short-latency (e.g. 40 ms) saccade is evoked toward the movement field of the recording site.

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