Nt1310 Unit 2 Lab Report

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Figure 1. Intact arm stimulation and recordings. In an intact arm preparation, the application of both electrical stimulation of the ANC (A; green arrow) and tactile stimulation of the arm skin (D; red arrow) elicits activity along the ANC (A and D; blue arrows). Exemplary recordings induced by electrical (B, C) and tactile (E, F) stimulation and reported at slow (B, E; scale bar = 1sec) and fast (C, F; scale bar =10ms) timescale. Single units’ activity are marked with red dots.
Figure 2. Design of ANC experimental procedure. The activity of the axonal tract is recorded by a suction electrode (labeled in blue in A) and its output is shown in black traces on the two panels (B) that display the results of the orthodromic (ORTO) and antidromic (ANTI) stimulation delivered from the two suction electrodes (labeled in green in A) respectively. Trains of 10 pulses of increasing strength (see stimulus intensity values reported beside each recording trace) stimulate the axonal tract. A force transducer connected to the muscle strand (red square) detects muscle contraction. Its output is shown in the gray traces below the stimulus trace in B. This procedure enables the detection of the threshold for induction of both recording and contraction. The faster time sweeps of the recordings, reported in the second and fourth columns of the panel B, show …show more content…
Distribution of high and low threshold fibers along the ANC. (A) Threshold stimulation inducing recordings (A) and contraction (B) is plotted against the distance between the electrodes. Pearson analysis show no correlation between distance and recording (Pearson correlation, ORTO: P>0.05, n=28; ANTI: P>0.05, n=31) nor contraction thresholds (Pearson correlation, ORTO: P>0.05, n=28; ANTI: P>0.05, n=31). Dashed lines mark the voltage range most of the responses fall within. Blue and red ellipses mark respectively low threshold values (~0 to 2V) registered at close and far location from the recording
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