Advances in Insect Physiology, Vol. 3 by J.W.L. Beament

By J.W.L. Beament

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Essentially the difference is that in the adaptational response, the full-time course of the negative “plateau” interposed between the on- and off-transients is revealed. A standard period of 5 min was chosen for both light- and dark-adaptation periods, it being found that the potential had nearly stabilized after these times. A typical record from the locust eye is shown in Fig. 4A obtained with a 10 p Ringer-pipette electrode in the ommatidial region together with a large electrode in the body.

Outer and inner optic glomeruli) to the calyces and the lobes of the corpora pedunculata, and the latter organs to one another. Typically the nerve cells arising within the corpora pedunculata send a fibre to the calyx, another to the A lobe and issue as a motor fibre from the B lobe. The latter fibres pass to the rest of the body. We know very little concerning what might happen to visual information once it passes from the optic lobe, but there is an abundance of neural pathways by which the central nervous system might make use of it.

3. Tima relations of visual impulse transmission Using as a source a brief flash of light of controllable intensity, the latencies for responses at various points along the visual pathway to the nerve cord were measured, choosing two standard intensities, one high (40000 lux) the other much lower (2 000 lux) since it was known that response latency was highly dependent on intensity. The illumination potential, presumably the first recordable electrical event, ranged in latency from 15 down to 6 msec in Locusta (larger value for lower intensity).

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