. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 202 A. GARM ET AL. A12- C y = 55582x + 1 5916 R2 = 0 9929 T T .1 ,^^ s. ^-"" 1 ^£^ cfl ^ 0 0 02 04 06 08 1 14 Amplitude in mm Interspike interval in ms CO _i _k N> ro oj w omocnomom T T T I | * D 04 08 1 12 14 Amplitude in mm Figure 5. Amplitude sensitivity of displacement neurons. (A) Response of displacement neurons, in spikes per displacement, increased with stimulus amplitude. Note that the stimulus amplitude refers to the distance traveled by the manipulatory hook and that the distance traveled
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 202 A. GARM ET AL. A12- C y = 55582x + 1 5916 R2 = 0 9929 T T .1 ,^^ s. ^-"" 1 ^£^ cfl ^ 0 0 02 04 06 08 1 14 Amplitude in mm Interspike interval in ms CO _i _k N> ro oj w omocnomom T T T I | * D 04 08 1 12 14 Amplitude in mm Figure 5. Amplitude sensitivity of displacement neurons. (A) Response of displacement neurons, in spikes per displacement, increased with stimulus amplitude. Note that the stimulus amplitude refers to the distance traveled by the manipulatory hook and that the distance traveled by any given part of the seta was not linear but followed a sine curve (see Materials and Methods for details). A best-fit regression line is drawn through the data points, and the regression equation and coefficient of determination (R~) are shown above it. (B) The mean mterspike inters al was not influenced by changes in the stimulus amplitude. Values are means ± SEM. n = 8 (8 neurons were tested with each amplitude, but the value from each neuron was a mean of 10 stimulations). Bend-sensitive neurons Several observations support bend-sensitivity. First, most of the bend neurons did not respond to large displacements, and the few that did gave a very small response—much smaller than to bending. In addition, six out of eight neurons did not respond to bending of the proximal half of the seta, showing that distal distortion is needed to activate most of the bend neurons. Finally, none of the bend neurons re- sponded after the distal part of the setal shaft was removed, whereas all the displacement neurons kept responding after the ablation. This again shows that the sensitive part of most of the bend neurons lies within the distal half of the seta. We therefore conclude that the division of the mechanosensory neurons into bend- and displacement-sensitive neurons is a real property and not a stimulation artifact. 30 }y = -1 4298x + 26 295 R2 = 0 9998 4 X 35 ^ w 25 j^ "
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
