Amplitude changes in the visual evoked cortical potential with backward masking

Electroencephalography and Clinical Neurophysiology
J L AndreassiB W Mellers

Abstract

A series of three experiments examined backward visual masking effects and visual evoked cortical potential correlates of such masking. In Experiment I, which was concerned with the effects of sequential sets of like stimuli (grids), it was found that when backward masking occurred, it was accompanied by decreased visual evoked potential (VEP) amplitudes. Experiment II replicated the first experiment using different stimuli (letter B's) and several new subjects. Again, backward masking was accompanied by decreased VEP amplitudes. In Experiment III, which examined the effects of sequential sets of unlike stimuli (B's and grids), it was found that when earlier stimuli differed in configuration from later stimuli, there was an absence of backward masking and VEP amplitude changes also failed to appear. Thus, when backward masking did not occur, no changes in the VEP were observed. The results are discussed in terms of interactions between excitatory and inhibitory activities produced at the visual cortex by the earlier and subsequently presented stimuli. Various concepts regarding the visual system mechanisms involved in backward masking, including integration and interruption hypotheses, may help to explain the complexity of find...Continue Reading

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Citations

Feb 1, 1984·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·J L Andreassi
Jul 14, 2001·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·E BernatH Shevrin
Jan 4, 2001·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·E BernatM Snodgrass
Jan 1, 2007·Advances in Cognitive Psychology·Bruno G Breitmeyer
Mar 10, 2009·Consciousness and Cognition·Henry Railo, Mika Koivisto
Dec 10, 2014·Human Brain Mapping·Holger F SperdinTheodor Landis
Jun 20, 2003·Current Biology : CB·Tony RoDavid Lane
Mar 27, 2019·Journal of Cognitive Neuroscience·Tony Ro
Jan 5, 2001·Perception & Psychophysics·B G Breitmeyer, H Ogmen
Apr 1, 1988·Perception & Psychophysics·B Bridgeman

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