Figure 3.

A1 responses from trained and control rats show absence of target specific enhancement. Population PSTHs for control (Row 1) and trained (Rows 2-7) rats show absence of target specific enhancement. Each column represents the sequences HLN, HHH, LLL, NNN and NLH. HLN was the target (red) sequence in all groups except the frequency discrimination group. Distractor and novel sequences are shown in blue and black respectively. Response to the target sequence (HLN: Column 1, red) was enhanced for trained groups compared to controls. After frequency discrimination training, responses to both the target (LLL) and distractor (HHH) sequences increased compared to controls. In the reverse order discrimination task, response to both target (HLN) and distractor (NLH) increased compared to naïve controls. Rats that trained to discriminate the target HLN sequence from 3 distractor sequences (High first and Noise first groups) also had increased responses to both the target and each of the distractors. For all groups, except the Reverse order group, NLH was the novel sequence used in the analysis (Column 5, black). Responses to this novel sequence also increased significantly in all trained rats compared to controls. Numbers within each subplot represent mean spikes/sequence (± s.e.m).