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J Neurophysiol 76: 1340-1343, 1996;
0022-3077/96 $5.00
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Journal of Neurophysiology, Vol 76, Issue 2 1340-1343, Copyright © 1996 by APS

ARTICLES

Temporal resolution in olfaction II: time course of recovery from adaptation in lobster chemoreceptor cells

G. Gomez and J. Atema
Boston University Marine Program, Marine Biological Laboratory, Woods Hole, Massachusetts 02543, USA.

1. Adaptation and disadaptation rates determine the temporal response properties of sensory receptor cells. In chemoreception, temporal filter properties of receptor cells are poorly understood. We studied the time course of disadaptation in lobster antennular chemoreceptor cells by using in situ high-resolution stimulus measurement and extracellularly recorded spike responses. Fifteen receptor cells were each tested with two series (one at 10 microM, one at 100 microM) of three odor (hydroxyproline) pulses: a 200-ms test pulse, a 5-s adapting pulse, and a 200-ms probe pulse after time intervals ranging from 1 to 60 s. After complete adaptation by the adapting pulse, individual cells recovered at different rates. After 1 s, a third of the cells responded with a mean response of 3 spikes/cell, representing approximately 20% recovery. All cells fully recovered between 10 and 30 s. Mean full recovery was within 25 s, with a time constant of 14 s, independent of stimulus concentration.


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