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Fig. 1. Experimental set-up. (A) Arrangement of the telemetry and video-recording
systems. The crayfish was placed in an experimental aquarium filled with water
to a depth of 15 cm. The floor was tilted by 10°. Four PIN-photodiodes
(PINPDs) as receivers were placed at the corners of a square of 30 cmx30
cm. An LED was driven by synchronous signals that were simultaneously fed,
together with nerve and EMG signals, to a DAT recorder. Due to the optical
signal decay along the distance from the transmitter, the recording was
reliable only in a limited area. The area illustrated in dark blue indicates
the area in which the telemetric transmission was secure. The light blue
indicates water in the aquarium. (B) The angular coordinate adopted in the
present study to describe the direction of animal body orientation. The head
direction and behavior of crayfish were video-recorded from above. (C) The
optical transmitter mounted on the animal. Wire electrodes for
electromyographic (EMG) recording from the mero-carpopodite flexor muscle and
the chronic electrode for extracellular recording from the circumesophageal
commissure were connected to the dual-channel transmitter. (D) Schematic
drawing of the chronic electrode for extracellular recording from the
circumesophageal commissure. Wire connection from the electrode to the
transmitter is shown by broken lines. The commissure was hooked up lightly by
the electrode to secure the recording during free movements. Two broken ovals
are lithium cells for the transmitter. They were omitted from the illustration
in C for the sake of clarity. IRLED; infrared LED.
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