Effects of check size on pattern reversal visual evoked magnetic field and potential

The effects of different check sizes on the 100m component of pattern reversal visual evoked magnetic fields (VEF) and the P100 component of visual evoked potentials (VEP) in terms of latency, amplitude and source localization were analyzed. Half field stimuli with or without central occlusion with check sizes of 15', 30', 60', 90' and 180' of visual arc were given to 7 healthy subjects. VEF and VEP were recorded simultaneously. The effect of the check size on the peak latency of both 100m and P100 was significant (P<0.01, ANOVA). The latencies for the smaller checks were significantly longer than those for the larger checks. The effect of the check size on the amplitude of the 100m to the stimulation with central occlusion was significant (P<0.05, ANOVA), but was not to the stimulation without central occlusion. That is, the amplitudes for the smaller checks were significantly smaller than those for the larger checks when using the stimulation with central occlusion, but not the stimulation without central occlusion. The effect of the check size on the P100 amplitude was not significant to the stimulation with and without central occlusion. The equivalent current dipoles were located around the calcarine fissure and did not differ significantly in location with check size. In conclusion, check size significantly affects the latency and amplitude of the 100m and/or P100, but not the receptive areas for the stimulation.

[1]  R Kakigi,et al.  Topography of somatosensory evoked magnetic fields following posterior tibial nerve stimulation. , 1995, Electroencephalography and clinical neurophysiology.

[2]  C J Aine,et al.  Generators of visually evoked neuromagnetic responses. Spatial-frequency segregation and evidence for multiple sources. , 1990, Advances in neurology.

[3]  Hiroshi Shibasaki,et al.  Temporal profile of visual evoked responses to pattern-reversal stimulation analyzed with a whole-head magnetometer , 1999, Experimental Brain Research.

[4]  R Kakigi,et al.  Visual evoked cortical magnetic fields to pattern reversal stimulation. , 1997, Brain research. Cognitive brain research.

[5]  A. Moskowitz,et al.  Age-related changes in the latency of the visual evoked potential: Influences of check size ☆ , 1981 .

[6]  Shozo Tobimatsu,et al.  Visual evoked cortical magnetic responses to checkerboard pattern reversal stimulation: A study on the neural generators of N75, P100 and N145 , 1998, Journal of the Neurological Sciences.

[7]  A. Halliday,et al.  Evoked potentials in clinical testing , 1982 .

[8]  S Noachtar,et al.  Pattern visual evoked potentials recorded from human occipital cortex with chronic subdural electrodes. , 1993, Electroencephalography and clinical neurophysiology.

[9]  D Ristanović,et al.  Effects of spatially structured stimulus fields on pattern reversal visual evoked potentials. , 1981, Electroencephalography and clinical neurophysiology.

[10]  Visual evoked electrical and magnetic response to half‐field stimulation using pattern reversal stimulation , 1992, Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians.

[11]  The early component of the visual evoked magnetic field. , 1995, Neuroreport.

[12]  H. G. Vaughan,et al.  The utility of visual evoked potentials using hemifield stimulation and several check sizes in the evaluation of suspected multiple sclerosis. , 1988, Electroencephalography and clinical neurophysiology.

[13]  M. Kato,et al.  Effect of central scotomata on pattern reversal visual evoked potentials in patients with maculopathy and healthy subjects. , 1986, Electroencephalography and clinical neurophysiology.

[14]  T. Pedley,et al.  Hemi-field pattern reversal visual evoked potentials. II. Lesions of the chiasm and posterior visual pathways. , 1982, Electroencephalography and clinical neurophysiology.

[15]  R. Ilmoniemi,et al.  Estimates of visually evoked cortical currents. , 1992, Electroencephalography and clinical neurophysiology.

[16]  G. Barrett,et al.  The effect of experimental 'scotomata' on the ipsilateral and contralateral responses to pattern-reversal in one half-field. , 1978, Electroencephalography and clinical neurophysiology.

[17]  G. Celesia,et al.  Pattern-reversal visual evoked potentials and retinal eccentricity. , 1982, Electroencephalography and clinical neurophysiology.

[18]  G. Barrett,et al.  The effect of field size on the pattern reversal visual evoked response (PRVER) , 1989 .

[19]  V. Iragui,et al.  Retinocortical time exhibits spatial selectivity. , 1988, Investigative ophthalmology & visual science.

[20]  R Kakigi,et al.  Visual evoked magnetic responses to central and peripheral stimulation: simultaneous VEP recordings. , 1998, Brain topography.

[21]  L. Kaufman,et al.  Visually evoked magnetic fields of the human brain , 1975, Science.

[22]  Topographic mapping of the pattern onset evoked magnetic response to stimulation of different portions of the visual field. , 1994, International journal of psychophysiology : official journal of the International Organization of Psychophysiology.

[23]  A. Ducati,et al.  Neuronal generators of the visual evoked potentials: intracerebral recording in awake humans. , 1988, Electroencephalography and clinical neurophysiology.

[24]  C. Yiannikas,et al.  The variation of the pattern shift visual evoked response with the size of the stimulus field. , 1983, Electroencephalography and clinical neurophysiology.

[25]  D. Kaufman,et al.  Effects of age and sex on pattern electroretinograms and visual evoked potentials. , 1987, Electroencephalography and clinical neurophysiology.

[26]  S Tobimatsu,et al.  Effect of check size on the pattern reversal visual evoked potential. , 1991, Electroencephalography and clinical neurophysiology.

[27]  Lloyd Kaufman,et al.  THE EVOKED MAGNETIC FIELD OF THE HUMAN BRAIN * , 1980, Annals of the New York Academy of Sciences.

[28]  C J Aine,et al.  Temporal dynamics of visual-evoked neuromagnetic sources: effects of stimulus parameters and selective attention. , 1995, The International journal of neuroscience.

[29]  N Nakasato,et al.  Neuromagnetic evidence that the P100 component of the pattern reversal visual evoked response originates in the bottom of the calcarine fissure. , 1996, Electroencephalography and clinical neurophysiology.

[30]  B. Török,et al.  The influence of pattern size on amplitude, latency and wave form of retinal and cortical potentials elicited by checkerboard pattern reversal and stimulus onset-offset. , 1992, Electroencephalography and clinical neurophysiology.

[31]  J C Armington,et al.  Effects of stimulus location and pattern upon the visually evoked cortical potential and the electroretinogram. , 1981, The International journal of neuroscience.

[32]  G. Malatesta,et al.  Visual evoked potentials (VEPs) to altitudinal stimuli: effects of stimulus manipulations on VEP scalp topography , 1993 .