ELIZA

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324223 occurrences (No.64 in the rank) during 5 years in the PubMed. [no cache] 500 found

256) We identified that the hippocampus in cetaceans (whales, dolphins and porpoises) is both absolutely and relatively small for their overall brain size, and found that the mammalian hippocampus scaled as an exponential function in relation to brain volume.

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PMID:24178679 DOI:10.1007/s00429-013-0660-1

2015 Brain structure & function

* In contrast to many other mammals, cetaceans have relatively small hippocampi that appear to lack adult neurogenesis.

- The hippocampus is essential for the formation and retrieval of memories and is a crucial neural structure sub-serving complex cognition. Adult hippocampal neurogenesis, the birth, migration and integration of new neurons, is thought to contribute to hippocampal circuit plasticity to augment function. We evaluated hippocampal volume in relation to brain volume in 375 mammal species and examined 71 mammal species for the presence of adult hippocampal neurogenesis using immunohistochemistry for doublecortin, an endogenous marker of immature neurons that can be used as a proxy marker for the presence of adult neurogenesis. We identified that the hippocampus in cetaceans (whales, dolphins and porpoises) is both absolutely and relatively small for their overall brain size, and found that the mammalian hippocampus scaled as an exponential function in relation to brain volume. In contrast, the amygdala was found to scale as a linear function of brain volume, but again, the relative size of the amygdala in cetaceans was small. The cetacean hippocampus lacks staining for doublecortin in the dentate gyrus and thus shows no clear signs of adult hippocampal neurogenesis. This lack of evidence of adult hippocampal neurogenesis, along with the small hippocampus, questions current assumptions regarding cognitive abilities associated with hippocampal function in the cetaceans. These anatomical features of the cetacean hippocampus may be related to the lack of postnatal sleep, causing a postnatal cessation of hippocampal neurogenesis.

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--- WordNet output for identified --- =>確認飛行物体;略:IFO Overview of verb identify The verb identify has 6 senses (first 6 from tagged texts) 1. (32) identify, place -- (recognize as being; establish the identity of someone or something; "She identified the man on the 'wanted' poster") 2. (7) name, identify -- (give the name or identifying characteristics of; refer to by name or some other identifying characteristic property; "Many senators were named in connection with the scandal"; "The almanac identifies the auspicious months") 3. (6) identify -- (consider (oneself) as similar to somebody else; "He identified with the refugees") 4. (4) identify -- (conceive of as united or associated; "Sex activity is closely identified with the hypothalamus") 5. (2) identify, discover, key, key out, distinguish, describe, name -- (identify as in botany or biology, for example) 6. (2) identify -- (consider to be equal or the same; "He identified his brother as one of the fugitives") Overview of adj identified The adj identified has 1 sense (first 1 from tagged texts) 1. (1) identified -- (having the identity known or established; "the identified bodies were released for burial") --- WordNet end ---