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The extent to which pattern reversal evoked potential amplitudes are distributed symmetrically over the scalp was investigated as a function of stimulus spatial frequency. Nine right-handed male subjects viewed sinusoidal grating stimuli of 4.0 and 0.5 c/deg phase reversed every 900 msec. A visual half-field configuration enabled selective stimulation of the right- or left-hemisphere visual cortex. Evoked responses were recorded from the 2 cm above the inion (Oz) and at 7 and 13 cm lateral to Oz. Analyses of normalized evoked response amplitudes showed a significant asymmetry for the 4.0 c/deg stimulus; right-hemisphere amplitudes declined as a function of distance from the midline, while left-hemisphere amplitudes were greatest at the 7 cm recording site. No hemispheric differences were observed for the 0.5 c/deg stimulus; amplitudes for both hemispheres declined as a function of distance from the midline. The data are discussed in terms of hemispheric differences in morphology and functional asymmetries at early levels of sensory processing.
K F van Orden, and
J F House
January 1982,
Annals of the New York Academy of Sciences,
K F van Orden, and
J F House
November 2004,
Documenta ophthalmologica. Advances in ophthalmology,
K F van Orden, and
J F House
January 2009,
Acta neurologica Scandinavica. Supplementum,
K F van Orden, and
J F House
March 1998,
Electroencephalography and clinical neurophysiology,
K F van Orden, and
J F House
September 1988,
Documenta ophthalmologica. Advances in ophthalmology,
K F van Orden, and
J F House
January 1977,
Neuropsychologia,
K F van Orden, and
J F House
March 2000,
Experimental brain research,
K F van Orden, and
J F House
January 1984,
Vision research,
K F van Orden, and
J F House
May 2006,
Neuroreport,
K F van Orden, and
J F House
May 2013,
Experimental brain research,
