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Incidence of cells showing increasing (left) or decreasing (right) spike responses that were persistent or phasic during ACQ1, ACQ2, and Criterion (Crit) sessions. The proportions observed were not different across training days for either response type (increasing: χ2 = 0.45, P = 0.80; decreasing: χ2 = 0.66, P = 0.72).
