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R. W. MURRAY
Fig. 1. Responses in a cutaneous nerve of Leuciscus to standard mechanical
stimuli (monitored on the upper traces) when the stimulator was warmed above the
temperature of the fish and the surrounding water (which was 5OC ). The temperatures given on the right of each trace refer to the stimulator. From Spath (1967).
temperature, and those applied after a drop in temperature are more
effective than before (Fig. 3). One of the complexities of this particular
experimental method results from the fact that the response to stimuli
repeated at l/sec falls off even at steady temperatures, and disappears
completely after about 30 sec, probably owing to viscoelastic movement
of the skin away from the point of stimulation. This accommodation can
be seen by interpolating a curve between curves A and C in Fig. 3, which
would represent the effect of stimulation at constant temperature. It
means that the effect of change of temperature cannot be followed all
the way through until a steady level is reached.
It can be seen now that Fig. 1 shows the same effect, for the skin is
in this case touched by a warm stimulator rather than by a neutral
stimulator (glass) while warm water is flowing over the stimulated point.
R. W. MURRAY
Fig. 1. Responses in a cutaneous nerve of Leuciscus to standard mechanical
stimuli (monitored on the upper traces) when the stimulator was warmed above the
temperature of the fish and the surrounding water (which was 5OC ). The temperatures given on the right of each trace refer to the stimulator. From Spath (1967).
temperature, and those applied after a drop in temperature are more
effective than before (Fig. 3). One of the complexities of this particular
experimental method results from the fact that the response to stimuli
repeated at l/sec falls off even at steady temperatures, and disappears
completely after about 30 sec, probably owing to viscoelastic movement
of the skin away from the point of stimulation. This accommodation can
be seen by interpolating a curve between curves A and C in Fig. 3, which
would represent the effect of stimulation at constant temperature. It
means that the effect of change of temperature cannot be followed all
the way through until a steady level is reached.
It can be seen now that Fig. 1 shows the same effect, for the skin is
in this case touched by a warm stimulator rather than by a neutral
stimulator (glass) while warm water is flowing over the stimulated point.