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Increased visual activity in advance of preferred choices. Peak visual activity was calculated from the postsynaptic activation functions as shown in Figure 2A. Neurons are classified based on whether they reached our criteria (see Materials and Methods, Neuronal classification) for preparatory activity (circles; N = 68) or not (squares; N = 27). A, Absolute peak visual activity. B, Peak visual activity after preparatory activity 0–50 ms after target presentation was subtracted out.
