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Fig. 1. (A) Positioning of electrodes for recording the activity in RS pathways.
One array (electrodes 1 and 2) was implanted at the level of the third gill,
and the other array (electrodes 3–6) 20–30 mm more caudally. (B)
Arrangement for recording vestibular responses in RS neurons. The lamprey was
positioned in the tube and rotated around its longitudinal axis (
, roll
tilt angle). (C) A representative example of vestibular responses in RS
pathways and individual RS axons in the animal compensated after the left
unilateral labyrinthectomy (UL). Two sequential full turns (clockwise and
counterclockwise) were performed in 45° steps. Shaded rectangles indicate
the normal (horizontal) orientation of the animal. Positions of the animal in
successive steps (in relation to the direction of gravity force) are shown.
The left half of the lamprey body is shaded. Vestibular responses were
measured separately for each of the three intervals of a step (inset); the
activity in interval 1 (during rotation) will be considered as a dynamic
response, the activity in intervals 2 and 3, as early and late static
responses, respectively. Traces E1 and E2 show the mass activity in RS
pathways recorded by the left and right electrodes of the rostral array,
respectively (electrodes 1 and 2 in A). Seven neurons were separated from the
mass activity using the spike-sorting program. The neurons L1–L3 had
their axons located on the left, ipsilateral to the UL side of the spinal cord
(i-UL group). The neurons R1-R4 had their axons located on the right,
contralateral to the UL side (co-UL group).
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