Fig. 2.

V1 single-unit responses. A: raster plots of representative single-unit responses for each of the 3 main laminar compartments (indicated at left) for the first (top) and fourth (bottom) presentations of each sequence. Green vertical lines indicate the onset of the visual stimulus (STIM ON). Red lines represent stimulus offset (STIM OFF). B: spike density functions for the same responses as in A. The response to each presentation is denoted by grayscale, with black indicating the first (P₁) and the lightest gray indicating the fifth presentation (P₅) of each sequence (bottom). Insets represent the mean spiking waveforms for each respective unit. C: median spike density functions for each monkey across all normalized single-unit responses per laminar compartment (n = no. of units). D: representation of median single-unit response profiles across both monkeys for each of the main laminar compartments. Black solid line is the median response for P₁ in the sequence (Init.). Red solid line is the response to P₄ (Rep.). Dotted lines represent the 95% confidence interval (CI) for the response with the corresponding color. Black and red bar above each plot denotes when P₁ and P₄ responses were significantly different at each time point after stimulus onset using paired-samples t-tests (P < 0.05).