Abstract
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1.
We developed a high resolution, on-line stimulus measurement system for accurate control of chemical stimulus applications for Homarus americanus lateral antennule chemoreceptors. Focal stimulus presentations in an electrophysiological preparation with the receptor sensilla intact were measured at small spatial (30 μm) and time (5 ms) scales.
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2.
We tested 15 receptor cells with ten 100 ms pulses of 104 M hydroxyproline at 0.5, 1, 2 and 4 Hz and with a single 8 s square pulse. Individual cells showed differences in their capabilities to resolve pulses (“flicker fusion”). At 2 Hz stimulation, some cells could follow stimulus pulses while others could not. At 4 Hz, 3 cells could still encode individual stimulus pulses accurately. The population resolved pulses up to 2 Hz; at 4 Hz, the population response to a pulse series approximated the response to a square pulse.
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3.
Repetitive stimulation caused a gradual decrease in the number of spikes and a gradual increase in first spike latency (“cumulative adaptation”). Increased stimulation frequency resulted in greater cumulative adaptation.
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4.
Since individual differences in adaptation and disadaptation rates of the receptor cells could not be attributed to measured stimulus variability in situ, lobster chemoreceptor cell populations have intrinsic temporal diversity which, we hypothesize, could be used to analyze pulsatile stimuli that occur in natural turbulent odor plumes.
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Abbreviations
- ASW:
-
artificial sea water
- Hyp:
-
hydroxyproline
- IVEC:
-
In Vivo Electrochemistry Computer system
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Gomez, G., Voigt, R. & Atema, J. Frequency filter properties of lobster chemoreceptor cells determined with high-resolution stimulus measurement. J Comp Physiol A 174, 803–811 (1994). https://doi.org/10.1007/BF00192730
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DOI: https://doi.org/10.1007/BF00192730