Movement Perception by the Movement Fibre in the Optic Tract of the Crayfish

DOI Web Site PubMed

Bibliographic Information

Other Title
  • ザリガニ視覚系における運動情報の抽出機構
  • ザリガニ シカクケイ ニ オケル ウンドウ ジョウホウ ノ チュウシュツ キコウ ソノ ジカン トクセイ ノ カイセキ
  • Analysis of Temporal Factors in Movement Perception
  • その時間特性の解析

Search this article

Description

In order to clarify the neural extracting mechanism of movement information which is transmitted by the movement fibres in the crayfish optic tract, the time-dependent process of the movement fibre responses was investigated by means of spatially stationary flickering light of various temporal patterns.<BR>The following results were obtained.<BR>1. The movement fibre does not respond at all to regular flickering light (inter-flash interval : 100-250 ms). This type of non-responsiveness should be termed as “habituation”. It is indicated from the experimental evidences that during habituation, a periodic activity synchronizing with the flickering light is constructed in neural network at the level of the optic ganglia and this periodic activity possesses some kind of “memory” of inter-flash interval and light value of flash.<BR>2. When the regular flickering light is turned off, transient response, e.g., “dishabituation” appears. The timing of dishabituation measured from the final flash-on has a linear relation to inter-flash interval of the flickering light.<BR>3. The irregularity of test flash given after regular flickering light elicits the response. In this case, the response time is determined by the result of comparison with the parameters of the preceding regular flickering light and those of the subsequent test flash. In this comparing function, each inter-flash interval is checked up and relative light value of each preceding flash is compared with one of the subsequent flashes.<BR>4. As described above, the minimum peripheral requirement for movement perception does not involve the spatial transfer of the form dx/dt, where x is the angular distance of the ommatidium perceiving the movement, but the irregularity appeared newly in the spatio-temporal pattern of the background.

Journal

Details 詳細情報について

Report a problem

Back to top