Détails sur le projet
Description
There is a long tradition of using neurophysiological techniques to aid
in identifying the functional brain systems that subserve qualitatively
different aspects of cognition. Likewise, deviance in
neurophysiological responses to cognitive challenge has often been used
to suggest regional abnormalities in clinical populations. Both types
of effort depend in part on parametric assumptions about the relations
of neurophysiological changes to extent of information processing.
However, neurophysiological indices of cognitive effort or processing
load for complex tasks have not been identified in electrophysiological
research and have not been examined in work with cerebral blood flow or
metabolism measures. This proposal will address this problem in four
experiments. rCBF and EEG will be simultaneously assessed during task
conditions which vary discretely in difficulty level. Experiment 1 and
2 will derive and cross-validate physiological features sensitive to
difficulty levels and determine the extent to which intensity of
manifestation and the spatial distribution of neural networks are
altered by manipulation of cognitive effort. Experiment 4 will assess
extent to which the derived features distinguish groups that differ in
age and/or task-related abilities. These studies will test specific
hypotheses concerning regional changes in neural activity that accompany
variation in cognitive effort within individuals. It will also test the
view that groups that differ in task-related abilities differ in the
neurophysiological patterns, even when task processing load is titrated
so that groups are equivalent in performance accuracy. Support of this
hypothesis may raise serious concerns about standard comparisons of
clinical and control groups in the neurophysiological concomitants of
information processing.
Statut | Terminé |
---|---|
Date de début/de fin réelle | 8/1/90 → 7/31/94 |
Financement
- National Institute of Mental Health
Keywords
- Fisiología
Empreinte numérique
Explorer les sujets de recherche abordés dans ce projet. Ces étiquettes sont créées en fonction des prix/bourses sous-jacents. Ensemble, ils forment une empreinte numérique unique.