Septohippocampal Cholinergic Modulation in Classical Conditioning

  • Brandon R. Ermita
  • Catherine E. Myers
  • Michael Hasselmo
  • Mark A. Gluck


In previous papers we have investigated the functional role of the hippocampal region in learning and memory using connectionist modeling techniques to focus on behavioral processes involved in associative learning (Gluck & Myers, 1993; Myers & Gluck, 1994). Additional work has extended the model by using known neuroanatomical architecture of the hippocampal formation to ascribe specific hippocampal and entorhinal cortical functions (Myers, Gluck & Granger, 1995). These models assume that the hippocampus develops new stimulus representations that enhance the discriminability of differentially predictive cues while the entorhinal cortex develops new stimulus representations that decrease the discriminability of similarly predictive cues. In subsequent work, (Myers, et al., 1996) by incorporating the ideas proposed by Hasselmo and Schnell (1994), the model has been extended to account for the physiologically-based effects of septohippocampal neuromodulation on associative learning. The modulation of hippocampal processing states may be controlled by cholinergic input from the basal forebrain, thus allowing for the hippocampus to be shifted between states of information storage and recall. By manipulating the learning rate of the hippocampal component, the model is useful in understanding the role of disruption of hippocampal processes by cholinergic blockade. Hippocampal computation may be more directly assessed through the application of the generalized Gluck & Myers model on both hippocampal-region mediated (delay conditioning) and hippocampal-region dependent (latent inhibition) associative learning tasks.


Latent Inhibition Classical Conditioning Hippocampal Lesion Cortical Network Conditioned Eyeblink 
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Copyright information

© Springer Science+Business Media New York 1997

Authors and Affiliations

  • Brandon R. Ermita
    • 1
    • 3
  • Catherine E. Myers
    • 1
  • Michael Hasselmo
    • 2
  • Mark A. Gluck
    • 1
  1. 1.Center for Molecular and Behavioral NeuroscienceRutgers UniversityNewarkUSA
  2. 2.Department of PsychologyHarvard UniversityCambridgeUSA
  3. 3.Center for Molecular and Behavioral NeuroscienceRutgers UniversityNewarkUSA

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