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Simulated PPF of EPSPs (A), PPD of IPSPs (B), and the slow IPSP (C). EPSPs and IPSPs in the Ex unit are shown in response to paired-pulse stimulation at intervals ranging from 25 to 375 msec. Note that that some of the apparent facilitation observed in response to intervals <75 msec is attributable to temporal summation as well as actual paired-pulse facilitation.
