Biomedical Engineering Reference
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Figure 2. CBCO coding of leg movements. (A) Representative intracellular recordings of (1) a phasic
release-sensitive CBCO neuron, (2) a phaso-tonic release-sensitive neuron, and (3) a continuously firing
release-sensitive neuron. (B) Examples of discharge patterns of four extracellularly-identified sensory
units in response to sinewave mechanical stimulation of the CBCO. (C) Position on the CBCO nerve
of two chronic electrodes (1) used to discriminate orthodromic and antidromic spikes (2). (D) Analysis
of orthodromic discharge in a levation-sensitive (Lev), depression-sensitive (Dep) and a tonic firing
sensory unit, along with an integrated transform (Integ) of levator muscle activity (EMG) during real
walking. Top traces are instantaneous frequency of corresponding units during locomotion. Bottom:
Event histograms of sensory unit discharge in relation to the onset/offset of the Lev EMG burst, and
cumulative sum curves, which highlights changes in occurrence probability, as determined from the
event histograms. Black sections of the curves show significant increased or decreased activity, while
stars indicate the level of significance.
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