Involvement of the basolateral complex and central nucleus of amygdala in the omission effects of different magnitudes of reinforcement

Behavioural Brain Research
Danielle M Judice-DaherJosé Lino O Bueno

Abstract

Evidence from appetitive Pavlovian and instrumental conditioning studies suggest that the amygdala is involved in modulation of responses correlated with motivational states, and therefore, to the modulation of processes probably underlying reinforcement omission effects. The present study aimed to clarify whether or not the mechanisms related to reinforcement omission effects of different magnitudes depend on basolateral complex and central nucleus of amygdala. Rats were trained on a fixed-interval 12s with limited hold 6s signaled schedule in which correct responses were always followed by one of two reinforcement magnitudes. Bilateral lesions of the basolateral complex and central nucleus were made after acquisition of stable performance. After postoperative recovery, the training was changed from 100% to 50% reinforcement schedules. The results showed that lesions of the basolateral complex and central nucleus did not eliminate or reduce, but interfere with reinforcement omission effects. The response from rats of both the basolateral complex and central nucleus lesioned group was higher relative to that of the rats of their respective sham-lesioned groups after reinforcement omission. Thus, the lesioned rats were more sens...Continue Reading

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Citations

Jun 26, 2013·Behavioural Brain Research·Danielle M Judice-Daher, José Lino O Bueno
Feb 27, 2014·Behavioural Brain Research·Tatiane F TavaresJosé Lino O Bueno
Jul 11, 2019·Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Médicas E Biológicas·T F TavaresJ L O Bueno

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