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Group mean log (L/R) response ratio in successive 2-s time bins after each of the four response-contingent events in each condition of Experiment 2. Preference pulses from Conditions 1 and 2 (Experiment 1) are reprinted to aid evaluation of the replication. Error bars (±1 standard error) are plotted at representative data points, first at time bin 0, and then in each time bin increasing in log2 units.
