Accession Number : ADA268426


Title :   Neuropsychological Component of Imagery Processing


Descriptive Note : Final rept. Dec 87-Nov 90,


Corporate Author : HARVARD UNIV CAMBRIDGE MA


Personal Author(s) : Kosslyn, Stephen M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a268426.pdf


Report Date : 25 Jan 1991


Pagination or Media Count : 60


Abstract : High-level visual processes make use of stored information, and are invoked during object identification, navigation, tracking, and visual mental imagery. The present work has resulted in a theory of the component processing subsystems used in high-level vision. This theory was developed by considering neuroanatomical, neurophysiological, and computational constraints. The theory has led to two kinds of empirical work: First, specific hypotheses about individual processing subsystems have been tested. For example, the analysis of the representation of spatial relations led to the prediction that two subsystems are used to encode this information, and a set of experiments was conducted that provided support for this distinction. This work has involved a combination of divided-visual-field experiments with normal subjects and detailed examinations of patients with focal brain damage. Second, the subsystems have been implemented in a large computer simulation model, which has been used to generate predictions about specific neurological syndromes. The model can be damaged in a variety of ways, and its performance on a set of tasks then observed. Predictions from the model have been tested, the the results generally support its underlying assumptions and specific claims. In addition, individual subsystems have been implemented as neural network simulation models, which have been related directly to properties of the neural substrate assumed to underlie processing. The experiments conducted to date are summarized in the context of the theory in this report, and the utility of the theory for understanding the effects of brain damage is illustrated by reviewing a single case study in detail Neuropsychology, Computational models, Spatial orientation


Descriptors :   *OPTICAL IMAGES , *CASE STUDIES , *BRAIN DAMAGE , SIMULATION , SPATIAL DISTRIBUTION , NEURAL NETS , DAMAGE , PREDICTIONS , MODELS , NETWORKS , MENTAL ABILITY , NEUROLOGY , PATIENTS , HYPOTHESES , VISION , NERVOUS SYSTEM , NAVIGATION , IDENTIFICATION , COMPUTERS , PROCESSING , THEORY , SIGNS AND SYMPTOMS , TRACKING , SUBSTRATES


Subject Categories : Psychology


Distribution Statement : APPROVED FOR PUBLIC RELEASE