Fig. 4. Results from the second-order conditioning control experiments. (A)
Experimental time course as in the blocking experiment depicted in
Fig. 3 (N=20). (B)
Time course as in A, but with the duration of the unreinforced presentation of
the compound stimulus reduced from 10 to 4 min prior to testing
(N=22). Cross-hatched columns, training; open columns, test period;
hatched columns, second-order training (no heat); shaded areas, compound
stimulus; unshaded areas, single stimulus. Values are means ±
S.E.M.
