Interaction of electro-ocular potentials with the contingent negative variation.

The contingent negative variation (CNV) was recorded from the vertex in forty-five subjects during a two-stimulus expectancy paradigm under varying conditions of eye closure and fixation. Simultaneously averaged electro-oculograms (EOG) were recorded as a measure of eye movement. The amplitude of both CNV and EOG responses was significantly greater for the eyes closed and eyes open unfixated conditions as compared to the eyes fixated condition. CNV and EOG responses were often highly similar in terms of waveform. For the eyes fixated condition three patterns of CNV–EOG interaction were observed. Eighteen subjects demonstrated a CNV response of low amplitude in the absence of detectable EOG responses. Twenty-three subjects showed a predominant pattern in which CNV responses of high amplitude and EOG responses were present. Four subjects failed to show either a CNV or EOG response. There was considerable within subject variability in the pattern of response with replicated blocks of trials. Thus contamination of the CNV by EOG potentials is reduced by eye fixation but not eliminated because of subject variability in control of eye movement.

[1]  Steven A. Hillyard,et al.  Relationships between the contingent negative variation (CNV) and reaction time , 1969 .

[2]  W. Walter,et al.  The interaction of responses in the brain to semantic stimuli. , 1966, Psychophysiology.

[3]  Chester W. Darrow,et al.  Eye movements, EEG, GSR and EKG during mental multiplication ☆ , 1962 .

[4]  D. Overton,et al.  PROBLEMS ASSOCIATED WITH APPLICATION OF THE CONTINGENT NEGATIVE VARIATION TO PSYCHIATRIC RESEARCH , 1969, The Journal of nervous and mental disease.

[5]  J. R. Hughes,et al.  RESPONSES FROM THE VISUAL CORTEX OF UNANESTHETIZED MONKEYS. , 1964, International review of neurobiology.

[6]  C S Rebert,et al.  Slow potential change in human brain related to level of motivation. , 1967, Journal of comparative and physiological psychology.

[7]  D. Mcadam,et al.  Motivational determinants of the "contingent negative variation". , 1966, Electroencephalography and clinical neurophysiology.

[8]  S A Hillyard,et al.  Effects of stimulus and response contingencies on a surface negative slow potential shift in man. , 1967, Electroencephalography and clinical neurophysiology.

[9]  A Kamp,et al.  Contingent negative variation and evoked responses recorded by radio-telemetry in free-ranging subjects. , 1967, Electroencephalography and clinical neurophysiology.

[10]  M. Low,et al.  Surface‐negative, slow‐potential shift associated with conditioning in man , 1966, Neurology.

[11]  V. Rowland.  Simple non-polarizable electrode for chronic implantation. , 1961, Electroencephalography and clinical neurophysiology.

[12]  W. Obrist,et al.  Relationship of slow potential changes to response speed and motivation in man. , 1969, Electroencephalography and clinical neurophysiology.

[13]  M. Low,et al.  Anxiety, attentiveness-alertness: A phenomenological study of the CNV ☆ , 1967 .

[14]  C S Rebert,et al.  Cortical slow potential changes in man related to interstimulus intevval and to pre-trial prediction of interstimulus interval. , 1969, Psychophysiology.

[15]  W. Walter,et al.  Contingent Negative Variation : An Electric Sign of Sensori-Motor Association and Expectancy in the Human Brain , 1964, Nature.

[16]  W G Walter,et al.  The effects of attention and distraction on the contingent negative variation in normal and neurotic subjects. , 1968, Electroencephalography and clinical neurophysiology.