. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MECHANO- AND OSMORECEPTORS IN P. ARGUS 205 B Stimulus Prolonged stimulation 1 S 2s 3s. 200-400 400-600 600-800 800-1000 Time interval in ms Figure 11. "Tactile" neurons from cuspidate setae. (A) Tapping the setae caused no visible movements of the seta, but produced one to two spikes per stimulation. (B) Example of phaso-tonic response to prolonged stimulation. (C) The phaso-tonic neurons from cuspidate setae tended to adapt slowly to prolonged stimulation, but the responses were not significantly different at the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MECHANO- AND OSMORECEPTORS IN P. ARGUS 205 B Stimulus Prolonged stimulation 1 S 2s 3s. 200-400 400-600 600-800 800-1000 Time interval in ms Figure 11. "Tactile" neurons from cuspidate setae. (A) Tapping the setae caused no visible movements of the seta, but produced one to two spikes per stimulation. (B) Example of phaso-tonic response to prolonged stimulation. (C) The phaso-tonic neurons from cuspidate setae tended to adapt slowly to prolonged stimulation, but the responses were not significantly different at the significance level (ANOVA). The line is the best-fit regression; the line equation and coefficient of determination are shown. Values are means ± SEM; n is indicated in bars. The decline in n values is due to the neurons being stimulated for different periods. ered about the prey items during feeding. If a living prey held by the mouthparts tries to escape, the directional sen- sitivity of the displacement neurons could indicate the di- rection of the movement. The amplitude- and velocity- sensitive neurons could give further detailed information about the movements of the prey. Tactile neurons from cuspidate setae Tactile neurons from cuspidate setae give phaso-tonic spiking responses, and they have very low response thresh- olds as indicated by their responsiveness to very small movements. This is not surprising since cuspidate setae have a much reduced socket and can hardly pivot in this socket (Vedel. 1985). Cuspidate setae are situated on the very distal or medial edge of the mouthparts and will therefore make the initial contact with prey. They are the setae most involved in the actual holding of the prey (Garm, 2004). Consequently, the tactile neurons could provide in- formation about when contact is made, and possibly also about the texture of the prey, by correlating the amplitude of the displacement with information from internal propriocep- tors. The responsive
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
