Spatio-temporal tuning of VEPs: Effect of mode of stimulation

N. R A Parry; I. J. Murray; C. Hadjizenonos

doi:10.1016/S0042-6989(99)00098-X

Spatio-temporal tuning of VEPs: Effect of mode of stimulation

N. R A Parry, I. J. Murray, C. Hadjizenonos

Research output: Contribution to journal › Article › peer-review

Abstract

The spatial tuning function of the 8 Hz reversal Visual Evoked Potential (VEP) is frequently bimodal. This amplitude 'notch' largely disappears with 16 Hz pattern onset-offset (on-off) stimulation. To investigate the effect of temporal frequency on this phenomenon, we tested seven subjects using a range of rates centred on 8 Hz (reversal) and 16 Hz (on-off). With reversal, a deep notch was present at all temporal frequencies. A much shallower notch was evident with on-off. The on-off and reversal functions differed only in their low spatial frequency branches (below 4.5 c deg-1) where, as temporal frequency decreased, the reversal response was reduced by 50%, whilst the on-off responses doubled in amplitude. Thus, although they behave differently with on-off and reversal, multiple spatial frequency mechanisms are evident with both forms of stimulation. Copyright (C) 1999 Elsevier Science Ltd.

Original language	English
Pages (from-to)	3491-3497
Number of pages	6
Journal	Vision Research
Volume	39
Issue number	21
DOIs	https://doi.org/10.1016/S0042-6989(99)00098-X
Publication status	Published - Oct 1999

Keywords

Amplitude
Contrast reversal
Evoked potential
Onset-offset
Spatio-temporal

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10.1016/S0042-6989(99)00098-X

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title = "Spatio-temporal tuning of VEPs: Effect of mode of stimulation",

abstract = "The spatial tuning function of the 8 Hz reversal Visual Evoked Potential (VEP) is frequently bimodal. This amplitude 'notch' largely disappears with 16 Hz pattern onset-offset (on-off) stimulation. To investigate the effect of temporal frequency on this phenomenon, we tested seven subjects using a range of rates centred on 8 Hz (reversal) and 16 Hz (on-off). With reversal, a deep notch was present at all temporal frequencies. A much shallower notch was evident with on-off. The on-off and reversal functions differed only in their low spatial frequency branches (below 4.5 c deg-1) where, as temporal frequency decreased, the reversal response was reduced by 50%, whilst the on-off responses doubled in amplitude. Thus, although they behave differently with on-off and reversal, multiple spatial frequency mechanisms are evident with both forms of stimulation. Copyright (C) 1999 Elsevier Science Ltd.",

keywords = "Amplitude, Contrast reversal, Evoked potential, Onset-offset, Spatio-temporal",

author = "Parry, {N. R A} and Murray, {I. J.} and C. Hadjizenonos",

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TY - JOUR

T1 - Spatio-temporal tuning of VEPs: Effect of mode of stimulation

AU - Parry, N. R A

AU - Murray, I. J.

AU - Hadjizenonos, C.

N1 - Times Cited: 11

PY - 1999/10

Y1 - 1999/10

N2 - The spatial tuning function of the 8 Hz reversal Visual Evoked Potential (VEP) is frequently bimodal. This amplitude 'notch' largely disappears with 16 Hz pattern onset-offset (on-off) stimulation. To investigate the effect of temporal frequency on this phenomenon, we tested seven subjects using a range of rates centred on 8 Hz (reversal) and 16 Hz (on-off). With reversal, a deep notch was present at all temporal frequencies. A much shallower notch was evident with on-off. The on-off and reversal functions differed only in their low spatial frequency branches (below 4.5 c deg-1) where, as temporal frequency decreased, the reversal response was reduced by 50%, whilst the on-off responses doubled in amplitude. Thus, although they behave differently with on-off and reversal, multiple spatial frequency mechanisms are evident with both forms of stimulation. Copyright (C) 1999 Elsevier Science Ltd.

AB - The spatial tuning function of the 8 Hz reversal Visual Evoked Potential (VEP) is frequently bimodal. This amplitude 'notch' largely disappears with 16 Hz pattern onset-offset (on-off) stimulation. To investigate the effect of temporal frequency on this phenomenon, we tested seven subjects using a range of rates centred on 8 Hz (reversal) and 16 Hz (on-off). With reversal, a deep notch was present at all temporal frequencies. A much shallower notch was evident with on-off. The on-off and reversal functions differed only in their low spatial frequency branches (below 4.5 c deg-1) where, as temporal frequency decreased, the reversal response was reduced by 50%, whilst the on-off responses doubled in amplitude. Thus, although they behave differently with on-off and reversal, multiple spatial frequency mechanisms are evident with both forms of stimulation. Copyright (C) 1999 Elsevier Science Ltd.

KW - Amplitude

KW - Contrast reversal

KW - Evoked potential

KW - Onset-offset

KW - Spatio-temporal

U2 - 10.1016/S0042-6989(99)00098-X

DO - 10.1016/S0042-6989(99)00098-X

M3 - Article

SN - 0042-6989

VL - 39

SP - 3491

EP - 3497

JO - Vision Research

JF - Vision Research

IS - 21

ER -

Spatio-temporal tuning of VEPs: Effect of mode of stimulation

Abstract

Keywords

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