Figure 6.

Relation between RF eccentricity and oscillation frequency of the LFP. (A) Simultaneously recorded neurons with RFs at central and peripheral regions of the visual field (RFs are indicated by circles and the fixation point by a cross) were stimulated by the same grating (left panel) or plaid (right panel) stimulus (Monkey 1). Central sites refer to ∼3° eccentricity and are represented by the continuous curves on both panels. Peripheral sites refer to ∼10° eccentricity and is represented by the dotted curves. Higher eccentricities induced lower frequencies, whereas the plaids continued to induce higher frequencies than the gratings for a given eccentricity. Thin traces enclose the 95% confidence interval of the mean. Vertical lines depict the peak frequency: Continuous lines for the gratings and dotted lines for the plaids. (B) Population data for all electrode pairs (n = 129) simultaneously recorded at central and peripheral sites. Straight lines link data points simultaneously acquired, confirming the overall trend described for the single case shown in (A). Each curve (A) or data point (B) is the average across the 16 directions of movement.