By J.W.L. Beament
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Extra resources for Advances in Insect Physiology, Vol. 3
This was revealed when, instead of using one electrode in the eye and a large indifferent connexion, two electrodes were used in the eye itself (Fig. 6). With the superficialelectrode at earth potential it was found that, whereas the on-transient was present throughout, the off-transient only appeared 32 E. T. B U R T T A N D W. T. CA T T O N when the deeper electrode passed through the basement membrane. With the original electrode arrangement the two transients appeared at all depths, since they were being recorded in series.
Optic lobe spike discharges A glass-shielded silver electrode of tip diameter 5-1 5 p, inserted through the cornea and passed along the axis of eye and optic lobe, was found to pick up spike discharges, partly “spontaneous” but also in response to visual stimuli (Burtt and Catton, 1956b, 1959, 1960). Irregular spikes of small amplitude were encountered throughout the depth of the eye itself and in the outer part of the optic lobe, giving responses to on/off and movement stimuli; there was no evidence of localization of these responses, which were therefore attributed to electrical spread from deeper sites of activity.
Hassenstein (1951) finds that in Chlorophanus the minimum stripe width to which turning re- 44 E. T. B U R T T A N D W. T. 8"in general agreement with the angular separation of the ommatidia morphologically. The important experiment from the present point of view is one in which the insect is suspended and separated from the cylinder of vertical stripes by a horizontal slit of such a width that two rows of ommatidia are projected through it. With this arrangement beetles show alternating directions of turning as the stripe width is altered; thus for a width of stripe below 4-5" there is no response; but a positive response (moving with the stripes occurs over the range 5-6", dropping down to zero at about 6-7".
Advances in Insect Physiology, Vol. 3 by J.W.L. Beament