Visual sensitivity and the state of adaptation in the antAtta sexdens (Hymenoptera: Formicoidea) |
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| Authors: | Dora F. Ventura Carlos Martinoya Susana Bloch Niélsy M. Puglia |
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| Affiliation: | (1) Departamento de Psicologia Experimental, Instituto de Psicologia da Universidade de São Paulo, São Paulo, Brasil;(2) Present address: Laboratoire de Psychophysiologie Sensorielle, Université de Paris VI, 4, Place Jussieu, F-75005 Paris, France |
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| Abstract: | In the worker ant,Atta sexdens, the ERG is cornea negative, shows two phasic and one tonic component and never presents an initial positive deflection. Dark adaptation was found to be complete within 10 min even with the longest pre-adapting duration used. Circadian variations were observed on continuous records, showing a tenfold sensitivity increase of the ERG during the night. Effects of light adaptation were also studied. The ERG amplitude can increase after light exposure. The possible role that pigment migration might play in the described sensitivity changes is discussed. |
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