Hemispheric asymmetry in the maturation of the extra striate checkerboard onset evoked potential

Ossenblok, P. and Munck de, J.C. and Wieringa, H.J. and Reits, D. and Spekreijse, H.J. (1994) Hemispheric asymmetry in the maturation of the extra striate checkerboard onset evoked potential. Vision research, 34 (5). pp. 581-590. ISSN 00426989

Preview

PDF
1142Kb

Abstract:	Recently we have shown that the single positive deflection in the checkerboard onset evoked potential (EP) of young children of striate origin develops into a negative-positive complex. However, also an early positive peak becomes apparent in the checkerboard onset EP. To determine the origin and development of the activity underlying this early positive deflection we studied the checkerboard onset EPs in children of 9¿16 years of age. It was found that for the children in this age group two different dipole sources are responsible for the activity underlying the pattern onset EP. One of the dipoles corresponds to the activity generated in the striate cortex, whereas a second dipole of extrastriate origin is responsible for the appearance of the early positive deflection. This extrastriate activity shows hemispheric asymmetry, i.e. the strength of the right hemispheric extrastriate source exceeds the strength of the left hemispheric source. These results are in accordance with histological studies of Conel (1939¿1963) [The postnatal development of the human cerebral cortex (Vols 1¿8). Cambridge, Mass.: Harvard Univ. Press] which show that the maturation of the extrastriate areas of the left hemisphere is delayed with respect to the right hemisphere.
Item Type:	Article
Copyright:	© 1994 Elsevier Science
Research Group:	Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/23779
Official URL:	http://dx.doi.org/10.1016/0042-6989(94)90014-0
Export this item as:	BibTeX EndNote HTML Citation Reference Manager

Show download statistics for this publication

Repository Staff Only: item control page

Metis ID: 128578