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The upper row shows the motion stimulus, and the lower row the change in firing rate due to the stimulation. The shaded area represents the neuronal noise level. The modeling idea is based on the following assumption: In order for a stimulus to be correctly discriminated (in 75 % of the trials), the change in firing rate must be at the neuronal noise level (right column) 223 × 180 mm (300 × 300 DPI)
