Skip to main content
. Author manuscript; available in PMC: 2010 Oct 1.
Published in final edited form as: Neuron. 2003 Feb 20;37(4):681–691. doi: 10.1016/s0896-6273(03)00035-7

Figure 1. Chromatic Tuning of Two V1 Neurons.

Figure 1

(A and B) Tuning to isoluminant stimuli. Horizontal axis, L-M cone contrast variation; vertical axis, S cone contrast variation. Stimulus hue changes as a function of polar angle. Data points in the polar plots show mean spike rate in a time window 50–150 ms after stimulus onset, error bars denote standard error. Tuning curves are linear interpolations of data points. Thin circles around the centers of polar plots indicate spontaneous firing rates. Insets show peri-stimulus time histograms for responses to stimuli in the corresponding directions.

(C and D) Tuning contours in three-dimensional color space, derived from responses to stimuli in 26 directions.

(C) Broadly tuned, nonopponent neuron.

(D) Color-opponent neuron tuned narrowly to different hues (azimuth) and more broadly tuned to stimuli with luminance differences (elevation).