. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 10 12 14 16 18 20 22 24 26 28 30 32 NUMBER OF 5-TRIAL BLOCKS Figure 2. Effect of implanting EMG electrodes during acquisition on behavioral performance. Group data for behavior in ACQUISI- TION, RETENTION, and RE-ACQUISITION of classical condition- ing. Data points are averages of four animals each. Filled symbols: ani- mals receiving paired stimuli during ACQUISITION. Open symbols: animals receiving specifically unpaired stimuli during ACQUISITION. Two populations were used. Triangles: normal unoperated animals; Circles: an
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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 10 12 14 16 18 20 22 24 26 28 30 32 NUMBER OF 5-TRIAL BLOCKS Figure 2. Effect of implanting EMG electrodes during acquisition on behavioral performance. Group data for behavior in ACQUISI- TION, RETENTION, and RE-ACQUISITION of classical condition- ing. Data points are averages of four animals each. Filled symbols: ani- mals receiving paired stimuli during ACQUISITION. Open symbols: animals receiving specifically unpaired stimuli during ACQUISITION. Two populations were used. Triangles: normal unoperated animals; Circles: animals with EMG wires implanted. In RE-ACQUISITION, dotted line is first day performance of the average of the (8) experimen- tal animals and is included for comparison. Probability of response is calculated as the total number of responses per animal per five-trial block. applied to operant conditioning experiments, a cumula- tive record is a good method for looking at trial-by-trial data. It is evident that, again, the groups are very similar, but inserting the EMG wires introduces variability in the pattern of response. In summary, the EMG record is a reliable method for following conditioning—the large differences between paired and unpaired groups are maintained—but the process of inserting electrodes may have a somewhat sensitizing effect on the CS responses. Pattern of behavior after conditioning As a second method of assessing the effect of training, we recorded a profile of behavioral responses after condi- tioning. For animals with EMG leads, wires were cut. All animals were returned to the home tank and then all (paired and unpaired controls) were tested for responses in three behavioral procedures. First, after 4 h, animals were given 50 CS-only presentations (second panel of Fig. 2). Then, after an additional 20 h, they were re-tested for responses to 10 CS-presentations (third panel of Fig. 2). Immediately after these 10 CS-only trials, animals were subjected t