Associative learning modifies the shortening reflex in the semi-intact leech Hirudo medicinalis: effects of pairing, predictability, and CS preexposure.

@article{Sahley1994AssociativeLM,
  title={Associative learning modifies the shortening reflex in the semi-intact leech Hirudo medicinalis: effects of pairing, predictability, and CS preexposure.},
  author={Christie L. Sahley and Nicholas M. Boulis and B A Schurman},
  journal={Behavioral neuroscience},
  year={1994},
  volume={108 2},
  pages={340-6}
}
Three experiments addressed the importance of the inter-event relationships of contiguity and contingency for associative learning in the semi-intact leech. It was found that both of these relationships are important for the leech to acquire a learned association between a touch (conditional stimulus, CS) and shock (unconditional stimulus, US). The learning can be extinguished if training is followed by explicitly unpaired presentations of the CS and US, which removes the contiguity between the… CONTINUE READING