. Author manuscript; available in PMC: 2010 May 1.

Published in final edited form as: Vision Res. 2008 Nov 7;49(10):1144–1153. doi: 10.1016/j.visres.2008.09.018

Table 1. Model parameters.

The first two columns show the values of the parameters used to construct the neural population. The third column explains the parameters of the contrast response function. The fixed parameter values are based on previous neurophysiological findings.

κ: Concentration parameter of the tuning function (π/4.5).	N : Number of neurons in the population (300).	M : baseline neural response (spikes/s).
R : Contrast response (defined by equation [3]).	f(θ_i): i^th neuron's tuning function.	R_max : Maximum neural response (spike/s).
θ_t: Preferred orientation of i^th neuron (4° or 2.5°).	θ_m : Mean difference in orientation between the two stimulus alternatives (0).	C : Stimulus contrast. C₅₀ : Stimulus contrast at half maximum response.
t : Stimulus duration (0.1 and 0.03 s for each respective study).	ρ_ij : Correlation in response between the i^th and j^th neuron (ρ_max : .2; δ: .1).	β: Slope of the contrast response function.
Δθ: Half difference in orientation between the two stimulus alternatives (4° or 2.5°).		Attentional gain parameters: a₁ (Response gain), a₂ (Contrast gain)