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Figure 4 | BMC Neuroscience

Figure 4

From: Context-dependent selection of visuomotor maps

Figure 4

Sensitivity to noise as a function of modulation strength in the antisaccade task. All results are for networks of 60 GM and 30 output neurons. The x-axes indicate γ, which is the minimum gain of the GM neurons; the maximum is always 1. In all panels, the three curves are for three levels of noise: α = 0.04 (thin lines), α = 0.36 (medium lines), or α = 2.25 (thick lines). a: Standard deviation of single output firing rates, averaged over stimulus locations and contexts, as a function of γ. Data points are from simulations; continuous lines are analytic results from Equation 39, with a = 1.42. For each data point, the average output responses, as functions of x and y, were the same. To achieve this, the synaptic weights for γ > 0 were obtained by a linear transformation of the weights for γ = 0 (Appendices B, C). b: Error between correct and encoded movement locations as a function of γ. Results are from the same simulations as in a. c, d: As in a, b, respectively, but for simulations in which the synaptic weights were computed using the standard, optimal algorithm (see Methods). Note that σ CM always increases with γ.

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