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Echo-delay facilitation: level versus temporal position. The effective stimulus that drove the neuron’s response was a P–E pair, separated by 12 msec delay. Reversing the temporal order of the stronger (P) and weaker (E) stimuli eliminated the response. The unit was tested using a fixed delay stimulus epoch broadcast at the preferred direction (64° contralateral). The time between presentation of each stimulus element (single P, P–E pair, single E) was 200 msec.
