Hirsh, Richard and Wiersma, C. A. G. (1977) The effect of the spacing of background elements upon optomotor memory responses in the crab: the influence of adding or deleting features during darkness. Journal of Experimental Biology, 66 . pp. 33-46. ISSN 0022-0949 http://resolver.caltech.edu/CaltechAUTHORS:HIRjeb77
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1. Study was made of the effect of separation between stripes in the visual field upon responses which indicate memory of those stripes. 2. The amount of separation between white stripes had very little effect, whereas response strength and the amount of separation between black stripes were directly proportional. 3. The presence of extra, non-displaced black stripes prior to or following displacement reduced the size of the memory responses. 4. The effects of the amount of separation in the two cases were comparable. In both situations the separation affected only the responses to displacement of the stripe borders nearest to the extra stripe. 5. The effect of extra stripes present prior to displacement was in turn affected by the duration of the dark period, whilst the effect of those present during the post-displacement period was not. This accounts for the larger effect of extra stripes present during the psot-displacement period. 6. By expanding stripe width during darkness it was possible to distinguish between the effects of distance between stripes and the amount of white space separating them. Reducing white space while distance remains constant causes reductions in response strength, whereas reducing the distance between a memory zone and the white space between it and the neighboring stripe increased the size of the memory response.
|Additional Information:||Copyright © 1977 by Company of Biologists. (Received 14 June 1976) Our special thanks are due to Mr K. Hollis for constructing the drum and for his help with the experiments. This work was supported by grants from the National Science Foundation BMS 73-06814, and the National Institutes of Health, EY-00906.|
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|Deposited On:||11 Jan 2009 07:39|
|Last Modified:||26 Dec 2012 10:42|
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