School of Computing

Why does brain damage impair memory? A connectionist model of object recognition memory in perirhinal cortex

R.A. Cowell, T.J. Bussey, and L.M. Saksida

The Journal of Neuroscience, 26(47):182-196, November 2006.

Abstract

Object recognition is the canonical test of declarative memory, the type of memory putatively impaired after damage to the temporal lobes. Studies of object recognition memory have helped elucidate the anatomical structures involved in declarative memory, indicating a critical role for perirhinal cortex. We offer a mechanistic account of the effects of perirhinal cortex damage on object recognition memory, based on the assumption that perirhinal cortex stores representations of the conjunctions of visual features possessed by complex objects. Such representations are proposed to play an important role in memory when it is difficult to solve a task using representations of only individual visual features of stimuli, thought to be stored in regions of the ventral visual stream caudal to perirhinal cortex. The account is instantiated in a connectionist model, in which development of object representations with visual experience provides a mechanism for judgment of previous occurrence. We present simulations addressing the following empirical findings: (1) that impairments after damage to perirhinal cortex (modeled by removing the �perirhinal cortex� layer of the network) are exacerbated by lengthening the delay between presentation of to-be-remembered itemsandtest, (2) that such impairments are also exacerbated by lengthening the list of to-be-remembered items, and (3) that impairments are revealed only when stimuli are trial unique rather than repeatedly presented. This study shows that it may be possible to account for object recognition impairments after damage to perirhinal cortex within a hierarchical, representational framework, in which complex conjunctive representations in perirhinal cortex play a critical role.

Download publication 547 kbytes (PDF)

Bibtex Record

@article{2850,
author = {R.A. Cowell and T.J. Bussey and L.M. Saksida},
title = {{W}hy does brain damage impair memory? {A} connectionist model of object recognition memory in perirhinal cortex},
month = {November},
year = {2006},
pages = {182-196},
keywords = {determinacy analysis, Craig interpolants},
note = {},
doi = {},
url = {http://www.cs.kent.ac.uk/pubs/2006/2850},
    publication_type = {article},
    submission_id = {21336_1225986859},
    journal = {The Journal of Neuroscience},
    volume = {26},
    number = {47},
}

School of Computing, University of Kent, Canterbury, Kent, CT2 7NF

Enquiries: +44 (0)1227 824180 or contact us.

Last Updated: 21/03/2014