An Apparatus for Recording Defensive Responses to Tactile Stimulation in the Ground Snail
2004
We describe here an original working experimental apparatus for non-invasive objective recording of the magnitudes of defensive responses to tactile stimulation in the ground snail. The apparatus includes a tracking device that ensures that the snail's position relative to a light and photodiode remains constant as it ascends a cylinder rotating about a horizontal axis. The device providing tactile stimulation is based on a loudspeaker circuit and provides blows of dosed energy. The snail responds to the tactile stimulation by retracting the antennae, head, and foot, which decreases the area of its shadow; this is recorded by a photodiode.
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