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8 April 2024 An assessment of the mechanosensory responses of peg sensilla on scorpion pectines
Hannah M. Peeples, Douglas D. Gaffin
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Abstract

Scorpions possess midventral touch/taste organs called pectines, which may be important for learning the nuances of the substrate during navigation as well as the detection of pheromones, spermatophores, and food. The pectines possess thousands of minute structures called peg sensilla that are responsive to both chemicals and mechanical deflection of the peg shaft. While much is known about the chemical responsiveness of the pegs, very little is known about their mechanosensory properties. Here we ask if the peg mechanosensory response is “all-or-nothing” or graded depending on the intensity of stimulation. We made electrophysiological recordings of neural activity from individual peg sensilla while deflecting the peg to elicit apparent mechanosensory responses. Our records show the presence of a rapid firing (.100 Hz), quickly adapting waveform that is indicative of a mechanoreceptor and appears to be independent of previously identified chemo-responsive cells. We tested mechanosensory response dynamics in two ways. The first test focused on a shorter-duration touch versus a longer-duration touch, while the second focused on a smaller deflection versus a larger deflection. Both pairs of stimulations (short vs long touch; small vs large touch) produced repeatable and statistically distinct responses in terms of spiking frequency. These results indicate the mechanosensory responses of peg sensilla are graded, which sheds light on the textural resolvability of the pectines and informs models of the type of information that scorpions obtain while assessing surfaces in their environment.

Hannah M. Peeples and Douglas D. Gaffin "An assessment of the mechanosensory responses of peg sensilla on scorpion pectines," The Journal of Arachnology 52(1), 1-8, (8 April 2024). https://doi.org/10.1636/JoA-S-22-052
Received: 19 August 2022; Accepted: 8 November 2022; Published: 8 April 2024
KEYWORDS
electrophysiology
mechanoreceptor
resolvability
sensilla
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