| Abstract: | 20 male albino Wistar rats with control operations, 20 with lesions in the amygdala, and 20 with lesions in the septal area were tested in a double runway. Results show that after omission of reward in the 1st goal box on 50% of the trials, control and septal Ss showed a frustration effect. Lesions in the amygdala eliminated this effect. Subsequent tests of extinction behavior indicated that Ss with control operations and Ss with damage in the amygdala showed a partial reinforcement extinction effect whereas Ss with septal lesions did not. It is concluded that frustration effects and extinction effects have independent neural substrates. (17 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
