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Fifteen pigeons were trained in a MULT VI 45-sec EXT schedule to discriminate between a vertical line (the positive stimulus) and a blank key (the negative stimulus). After 10 days of training, they were given a generalization test on the dimension of line orientation and matched into three groups, which received lesions of the ectostriatum or of nucleus intercalatus hyperstriati accessorii (IHA) in the Wulst or sham lesions. After a week of recovery postoperatively, they were given one more day of training on the discrimination, then a second generalization test, identical to the first. They were then trained for 10 days on a MULT VI 45-sec EXT schedule, with the vertical line as the positive stimulus and a horizontal line as the negative stimulus. Finally, they were given a third generalization test. Pigeons with ectostriatal lesions were not different from shams on the first postoperative generalization test, but they were poorer at the discrimination between horizontal and vertical postoperatively and they showed a flatter gradient than shams on the final generalization test. These findings suggest that ectostriatal lesions result in a deficit in the development of inhibitory processes to the S-. Pigeons with Wulst lesions were not different from shams for the most part, but they did show more trials without response on the final generalization test. There was no suggestion of an impairment by Wulst lesions on the negative component of the go/no-go discrimination.

The effects of lesions in telencephalic visual areas on stimulus generalization in pigeons