Central versus peripheral visual field stimulation results in timing differences in dorsal stream sources as measured with MEG.
Small, achromatic circular sinusoids were presented in the central and peripheral visual fields to investigate dorsal visual stream activation. It was hypothesized that peripheral stimulation would lead to faster onset latencies, as well as preferentially activate dorsal stream visual areas relative to central field stimulation. Although both central and peripheral stimulation activated similar areas, the onset latencies of neuromagnetic sources in two dorsal stream areas were found to be significantly shorter for peripheral versus central field stimulation. The results suggest that information from central versus peripheral fields arrives in the higher-order visual areas via different routes.
Stephen
Julia M
JM
Department of Radiology, University of New Mexico School of Medicine, Albuquerque, NM 87131, USA. jstephen@unm.edu
Aine
Cheryl J
CJ
Christner
Robert F
RF
Ranken
Doug
D
Huang
Mingxiong
M
Best
Elaine
E
D000328:Adult; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D015225:Magnetoencephalography; D008297:Male; D008875:Middle Aged; D010775:Photic Stimulation / Q000379:methods; D011930:Reaction Time / Q000502:physiology; D014793:Visual Cortex / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology*; D014795:Visual Pathways / Q000502:physiology; D014796:Visual Perception / Q000502:physiology*