The proposed studies will investigate some of the factors which can prevent normal development of projections involved in interhemispheric interactions, and will determine the functional consequences of such anamolous projections or cortical processing. The proposed research will focus on the role of activity-dependent mechanisms. We will eliminate information based on local correlated neural activity by producing synchrony of cortical activity (with convulsant-induced epileptiform activity) and synchrony of cortical afferents (with strobe rearing). We will use anatomical tracing methods to determine the extent to which these treatments result in the anomalous survival of immature callosal projections which are normally eliminated during development. We will use physiological methods to determine the extent to which anomalous projections are functional. The proposed studies will elucidate some of the mechanisms involved in hemispheric interactions and may also offer a valuable model for the understanding of intellectual deficits resulting from childhood epilepsy.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS026989-02
Application #
3413116
Study Section
Neurosciences Research Review Committee (BPN)
Project Start
1988-07-01
Project End
1991-06-30
Budget Start
1989-07-01
Budget End
1990-06-30
Support Year
2
Fiscal Year
1989
Total Cost
Indirect Cost
Name
Allegheny University of Health Sciences
Department
Type
Schools of Medicine
DUNS #
City
Philadelphia
State
PA
Country
United States
Zip Code
19129
Grigonis, A M; Murphy, E H (1994) The effects of epileptic cortical activity on the development of callosal projections. Brain Res Dev Brain Res 77:251-5
Grigonis, A M; Rayos del Sol-Padua, R B; Murphy, E H (1992) Visual callosal projections in the adult ferret. Vis Neurosci 9:99-103
Grigonis, A M; Murphy, E H (1991) Organization of callosal connections in the visual cortex of the rabbit following neonatal enucleation, dark rearing, and strobe rearing. J Comp Neurol 312:561-72