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タイトル: | Cerebral cortical processing time is elongated in human brain evolution |
著者: | Itoh, Kosuke Konoike, Naho ![]() ![]() ![]() Nejime, Masafumi Iwaoki, Haruhiko Igarashi, Hironaka Hirata, Satoshi ![]() ![]() ![]() Nakamura, Katsuki ![]() ![]() |
著者名の別形: | 伊藤, 浩介 鴻池, 菜保 禰占, 雅史 岩沖, 晴彦 五十嵐, 博中 平田, 聡 中村, 克樹 |
キーワード: | Auditory system Cognitive neuroscience Neurophysiology |
発行日: | 2022 |
出版者: | Springer Nature |
誌名: | Scientific Reports |
巻: | 12 |
論文番号: | 1103 |
抄録: | An increase in number of neurons is presumed to underlie the enhancement of cognitive abilities in brain evolution. The evolution of human cognition is then expected to have accompanied a prolongation of net neural-processing time due to the accumulation of processing time of individual neurons over an expanded number of neurons. Here, we confirmed this prediction and quantified the amount of prolongation in vivo, using noninvasive measurements of brain responses to sounds in unanesthetized human and nonhuman primates. Latencies of the N1 component of auditory-evoked potentials recorded from the scalp were approximately 40, 50, 60, and 100 ms for the common marmoset, rhesus monkey, chimpanzee, and human, respectively. Importantly, the prominent increase in human N1 latency could not be explained by the physical lengthening of the auditory pathway, and therefore reflected an extended dwell time for auditory cortical processing. A longer time window for auditory cortical processing is advantageous for analyzing time-varying acoustic stimuli, such as those important for speech perception. A novel hypothesis concerning human brain evolution then emerges: the increase in cortical neuronal number widened the timescale of sensory cortical processing, the benefits of which outweighed the disadvantage of slow cognition and reaction. |
記述: | サルより遅いヒトの脳処理 --進化するほど脳の回転は遅くなる!?--. 京都大学プレスリリース. 2022-01-26. |
著作権等: | © The Author(s) 2022 This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. |
URI: | http://hdl.handle.net/2433/267709 |
DOI(出版社版): | 10.1038/s41598-022-05053-w |
PubMed ID: | 35058509 |
関連リンク: | https://www.kyoto-u.ac.jp/ja/research-news/2022-01-26 |
出現コレクション: | 学術雑誌掲載論文等 |
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