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Please use this identifier to cite or link to this item: http://hdl.handle.net/10445/4395

Title: Protoplasmic computing to memorize and recall periodic environmental events
Authors: Tero, Atsushi
Saigusa, Tetsu
Nakagaki, Toshiyuki
Abstract: Single-celled organisms might be more intelligent than previously envisaged[1]-[5]. The acts of anticipating and recalling events are higher functions performed by the brains of higher animals; their evolutionary origins and the way they self-organize, however, remain open questions. Here we show that an amoeboid organism can anticipate the timing of periodic events. The plasmodium of the true slime mold Physarum polycephalum moves rapidly under favorable conditions, but stops moving when transferred to less-favorable conditions. For example, plasmodia exposed to low temperature and low humidity, presented in three consecutive pulses at constant intervals, reduced their locomotive speed in response to each episode. When favorable conditions were subsequently reintroduced, the plasmodia spontaneously reduced their locomotive speed at the point in time when the next unfavorable episode would have occurred. This implies that the plasmodia are able to anticipate impending environmental change. After this anticipatory response had been evoked several times, the locomotion of the plasmodia returned to normal speed; however, the slowing down could subsequently be induced by a single unfavorable pulse, implying recall of the periodicity that had been memorized. We have explored the mechanisms underlying this behavior from a dynamical systems perspective. Our results suggest that this primitive intelligence is of cellular origin and that simple dynamics might be sufficient to explain its emergence. abstract environment.
Research Achievement Classification: 原著論文/Original Paper
Type: Journal Article
Peer Review: あり/yes
Solo/Joint Author(s): 共著/joint
Published journal or presented
academic conference: 
Natural Computing, 2nd International Workshop on Natural Computing,Proceedings in Information and Communications Technology
Volume: PICT 1
Spage: 213
Epage: 221
Date: 2009
Publisher: Springer-Verlag
Appears in Collections:Nakagaki Toshiyuki

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