PMID: 8951825Dec 1, 1996Paper

Early visual processing in neglect patients: a study with steady-state VEPs

Neuropsychologia
P AngelelliDonatella Spinelli

Abstract

Reliable steady-state visual evoked potentials (VEPs) were recorded in a group of 19 right brain-damaged patients with visuospatial hemineglect (Neglect), and two control groups: 15 left brain-damaged (LBD) patients and 12 right brain-damaged (RBD) patients without neglect. Moreover, VEPs were recorded in two rare cases of left brain damage and right visuospatial hemineglect. Stimuli were gratings phase-reversed at various temporal frequencies presented in the left and right visual field. In the Neglect group, VEPs to stimuli displayed in the left visual field (contralesional stimuli) had longer latencies. The delay was not present for the two control groups. As regards the VEP amplitudes, the Neglect group data showed a less distinctive pattern than in the case of latency. VEPs to stimuli contralateral to the lesion were smaller than those recorded for stimuli ipsilateral to the lesion in both Neglect and RBD groups. On the contrary, the VEP amplitudes for the two hemifields were comparable in the LBD group. In the case of left brain damage and neglect, VEPs to right visual field stimuli had longer latencies and lower amplitudes compared to the ipsilesional responses in both patients. Overall, the data support the view that, i...Continue Reading

References

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Citations

Jan 28, 1998·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·S PitzalisP Zoccolotti
Nov 22, 1997·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·G Vallar
Jan 18, 2005·Experimental Brain Research·Sabrina PitzalisDonatella Spinelli
Jul 3, 2004·Experimental Brain Research·Sabrina PitzalisDonatella Spinelli
Aug 2, 2000·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·N BeschinS Della Sala
Feb 24, 2009·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Guido GainottiFabrizio Doricchi
Oct 27, 2007·Brain and Cognition·B A Castro-BarrosL E Ribeiro-do-Valle
Oct 21, 2005·Neuropsychologia·Thomas Habekost, Egill Rostrup
Nov 26, 2010·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·Ina M TarkkaHeikki Hämäläinen
Apr 3, 2012·Neuropsychologia·Stéphane JacobsAlessandro Farnè
Dec 18, 2003·The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry·Bertram R Payne, R Jarrett Rushmore

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