Table 1.

Responses of the PCs to the CS and the patterns of conditioning-related changes

Number of responses to the CS in habituation sessions		Number of responses to the CS in the last ten trials in the acquisition sessions
excitatory	8	increased excitation	1
		decreased excitation	1
		inhibition (reversed)	5
		no change	1
inhibitory	4	increased inhibition	1
		excitation (reversed)	1
		no change	2
no response	9	excitation	1
		inhibition	4
		no change	4