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  • Title: Habituation of the shortening reflex in the medicinal leech.
    Author: Lockery SR, Rawlins JN, Gray JA.
    Journal: Behav Neurosci; 1985 Apr; 99(2):333-41. PubMed ID: 3843715.
    Abstract:
    The shortening reflex was elicited in food-sated Hirudo medicinalis by light flashes delivered at 20-s intervals over a 40-trial session. The reflex was enhanced if animals were stored at 5-7 degrees C rather than 20 degrees C. Short-term, that is, within-sessions, habituation was readily observed. Dishabituation could be produced by a single electric shock at Trial 30. However, the shock also enhanced responding when delivered before Trial 1 (sensitization). No long-term, that is, between-sessions, habituation occurred over 6 consecutive days of testing; on the contrary, responding gradually increased.
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