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Fig. 2. Characterizing the responses elicited by stimulation of either the parallel
fibers (PF) or the afferent nerve (Aff). (A,B) Extracellular recording of the
responses to Aff (A) and PF (B) stimulation. Each record represents the
average response to eight consecutive stimuli delivered at a rate of 0.1 Hz
and recorded at a depth of 500 µm below the surface of the DON. (A) The
response of the DON to Aff nerve stimulation is characterized by an early
positive component (arrowhead); the main triphasic component is marked by an
upward arrow and the second small negative component is marked by a double
arrowhead. (B) The response of the DON to PF stimulation is characterized by
significant longer delay, the pronounced second negativity and the overall
longer duration of the PF response in compare to Aff response. (C,D)
Intracellular recording of the responses to Aff (C) and PF (D) stimulation.
(C) Sub- and supra-threshold responses to Aff stimulation recorded
intracellularly. The subthreshold synaptic potential was occasionally composed
of two depolarizing phases separated by a short delay (arrow). (D) Sub- and
supra-threshold responses to PF stimulation recorded intracellularly. Note the
higher threshold of the PF evoked action potential.
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