Conserved spatial reminiscence mechanisms
Meals-caching birds are reminiscence specialists that may keep in mind hundreds of hidden meals gadgets. Utilizing electrophysiological recordings from freely behaving birds, Payne et al. analyzed neuronal exercise within the possible hippocampus homolog of two hen species, the tufted titmouse and the zebra finch. They selected these two species to check, respectively, birds that do and don’t show food-caching conduct. Place cells and typical hippocampal firing patterns that resembled rodent neuronal exercise might be detected within the excessive reminiscence specialists. In contrast with titmice, nevertheless, spatial exercise was noticeably weaker and fewer plentiful in zebra finches. These findings present proof that the neural processes underlying spatial reminiscence are remarkably conserved throughout broadly divergent hippocampal circuits separated by thousands and thousands of years of evolution.
Science, abg2009, this subject p. 343
Spatial reminiscence in vertebrates requires mind areas homologous to the mammalian hippocampus. Between vertebrate clades, nevertheless, these areas are anatomically distinct and seem to supply totally different spatial patterns of neural exercise. We requested whether or not hippocampal exercise is basically totally different even between distant vertebrates that share a robust dependence on spatial reminiscence. We studied tufted titmice, food-caching birds able to remembering many hid meals areas. We discovered mammalian-like neural exercise within the titmouse hippocampus, together with sharp-wave ripples and anatomically organized place cells. In a non–food-caching hen species, spatial firing was much less informative and was exhibited by fewer neurons. These findings recommend that hippocampal circuit mechanisms are related between birds and mammals, however that the ensuing patterns of exercise might fluctuate quantitatively with species-specific ethological wants.