Neonatal amygdala or hippocampus lesions influence responsiveness to objects

Eliza Bliss-Moreau, Jessica E. Toscano, Melissa D Bauman, William A. Mason, David G Amaral

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Medial temporal lobe brain structures, such as the amygdala, play an important role in the normal perception and generation of emotional behavior. Little research, however, has assessed the role of such structures across the neurodevelopmental trajectory. We assessed emotional behavioral responses of rhesus macaques that received bilateral ibotenic acid lesions of the amygdala or hippocampus at 2 weeks of age and sham-operated controls. At 9 and 18 months of age, animals interacted with novel objects that varied in visual complexity as a means of varying emotional salience. All animals behaved differently in the presence of visually simple, as compared to complex, objects, suggesting that they were sensitive to variation in emotional salience. Across both experiments, amygdala-lesioned animals appeared to be less behaviorally inhibited insofar as they explored all objects most readily. Interestingly, hippocampus-lesioned animals' propensity for exploration mirrored that of control animals in some contexts but that of amygdala-lesioned animals in other contexts. At 18 months of age, both amygdala-lesioned and hippocampus-lesioned animals were judged to be less fearful than controls during the testing procedure. Implications for understanding the neurobiology of emotional behavior are discussed.

Original languageEnglish (US)
Pages (from-to)487-503
Number of pages17
JournalDevelopmental Psychobiology
Issue number5
StatePublished - Jul 2010


  • Amygdala
  • Emotional behavior
  • Hippocampus
  • Macaca mulatta
  • Neurodevelopment
  • Nonhuman primate
  • Novelty
  • Rhesus macaque

ASJC Scopus subject areas

  • Developmental Biology
  • Behavioral Neuroscience
  • Developmental Neuroscience
  • Developmental and Educational Psychology


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