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. Author manuscript; available in PMC: 2006 Mar 8.
Published in final edited form as: Integr Physiol Behav Sci. 2002;37(4):293–310. doi: 10.1007/bf02734250

TABLE 1.

Training procedure (symbol designations: + = shock US,− = no US, T1 = 8 kHz tone, T2= 2 kHz tone, and L = light)

Phase Name Stimuli Drug
1 Acquisition T1+ none
2 Feature-negative discrimination T2+, T2L- none
3 Drug infusion/retention test T2+, T2L- picrotoxin
4 Summation test T1-, T1L- none
5 Retardation test L+ none