Figure 4.
Impact of habituation on chromatic tuning of V1 neurons. A–D, Responses of four neurons to modulation along color directions in the isoluminant plane during control conditions (filled symbols) and during habituation (open symbols) to L–M modulation (indicated by the shaded bar at azimuth 0°). The smooth/dashed lines show predictions of the best fitting model. E–H, Responses of the same four neurons during control conditions (filled symbols) and during habituation (open symbols) to modulation along an azimuth of 135° (indicated by the shaded bar at azimuth 135°). The smooth/dashed lines show predictions of the best fitting model. The model parameters for the cells shown are as follows: m189d, θ = 2.8°, Rmax = 19.9, n = 3.58, ALM = 0.67, AS = 0.0, ϑ = 20.2°, σ = 0.58, Vt (0°) = 0.017, Vt (135°) = 0.012; m192x, θ = 39.0°, Rmax = 14.42, n = 2.45, ALM = 0.25, AS = 0.12, ϑ = 41.3°, σ = 0.003, Vt (0°) = 0.076, Vt (135°) = 0.0; m188b, θ = 157.7°, Rmax = 33.2, n = 2.0, ALM = 0.70, AS = 0.59, ϑ = 17.3°, σ = 1.14, Vt (0°) = 0.0, Vt (135°) = 0.056; and m200n, θ = 108.3°, Rmax = 15.2, n = 2.32, ALM = 0.34, AS = 0.00, ϑ = 38.7°, σ = 0.047, Vt (0°) = 0.0, Vt (135°) = 0.222.