THE rapid withdrawal reflex of the polychaetes Nereis diversicolor, N. pelagica and Platynereis dumerilii habituates rapidly to sudden stimuli, such as changes in illumination or mechanical stimuli, but if a foreign stimulus is interpolated in a series of stimulus presentations it is usually followed by greater reactivity to the original stimulus. Responses can sometimes be induced to sudden decreases in light intensity in completely habituated worms by the interpolation of a single tactile stimulus. This process of reflex sensitization has already been described in the polychaete Mercierella enigmatica1.
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Sensitization and dishabituation in the cockroach. Main characteristics and localization of the changes in reactivity
Comparative Biochemistry and Physiology Part A: Physiology (1974)
Animal Behaviour (1971)