Journal
BEHAVIORAL NEUROSCIENCE
Volume 123, Issue 4, Pages 804-809Publisher
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/a0016320
Keywords
autoshaping; basal forebrain; negative patterning; scopolamine; turtles
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Turtles were run on a negative patterning task involving 2 positive elements, a key with white stripes on a black background, and a solid red key, and a compound stimulus combining the 2 elements, white stripes on a red background. Injections of scopolamine, methylscopolamine, or saline were started at the same time that the compound stimulus was introduced, after the animals had been autoshaped to press the key for each of the elements. Scopolamine disrupted the learning of negative patterning, but methylscopolamine had no effect. In contrast, learning of a simple discrimination between the elements was not affected by scopolamine. These results show that muscarinic cholinergic receptors are involved in the learning of negative patterning in turtles.
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