title: Expression of immediate early genes in the hippocampal formation of the black-capped chickadee (Poecile atricapillus) during a food-hoarding task.
abstract: Black-capped chickadees store food in many different locations in their home range and are able to accurately remember these locations. We measured the number of cells immunopositive for three different Immediate Early Gene products (Fra-1, c-Fos and ZENK) to map neuronal activity in the chickadee Hippocampal Formation (HF) during food storing and retrieval. Fra-1-like immunoreactivity is downregulated in the dorsal HF of both storing and retrieving chickadees compared to controls. In retrieving birds, the number of Fos-like immunoreactive neurons relates to the number of items remembered, while the number of ZENK-like immunoreactive neurons in the HF may be related to the accuracy of cache retrieval. These results imply that the brain might process complex information by recruiting more neurons into the network of active neurons. Thus, our results could help explain why food-hoarding birds have more HF neurons than non-hoarders, and why this number increases in autumn when large numbers of food items are cached.
authors.affiliation: Department of Psychology, Uris Hall, Cornell University, Ithaca, NY 14853, USA. tsmulder@wfubmc.edu
authors.forename: T V
authors.initials: TV
authors.lastname: Smulders
authors.forename: T J
authors.initials: TJ
authors.lastname: DeVoogd
mesh_terms: D000465:Algorithms; D000818:Animals; D002452:Cell Count; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics; D005247:Feeding Behavior / Q000502:physiology*; D005786:Gene Expression Regulation / Q000235:genetics / Q000502:physiology*; D017781:Genes, Immediate-Early / Q000235:genetics*; D016762:Genes, fos / Q000235:genetics; D006624:Hippocampus / Q000166:cytology / Q000378:metabolism / Q000502:physiology*; D017874:Immediate-Early Proteins / Q000096:biosynthesis / Q000235:genetics; D007150:Immunohistochemistry; D020308:Songbirds / Q000502:physiology*; D014157:Transcription Factors / Q000096:biosynthesis / Q000235:genetics
chemical_list: D004268:DNA-Binding Proteins; D017874:Immediate-Early Proteins; D014157:Transcription Factors