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THE CONTINGENT NEGATIVE VARIATION: SOME METHODOLOGICAL PROBLEMS IN THE RECORDING OF SHIFTS IN STEADY POTENTIALS
Author(s) -
Surwillo Walter W.
Publication year - 1971
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.1971.tb00453.x
Subject(s) - contingent negative variation , variation (astronomy) , amplifier , psychology , chopper , condenser (optics) , electronic circuit , amplitude , control theory (sociology) , audiology , electroencephalography , neuroscience , computer science , electrical engineering , physics , telecommunications , optics , bandwidth (computing) , engineering , medicine , light source , control (management) , artificial intelligence , voltage , astrophysics
The various methods that have been used in recording of the Contingent Negative Variation (CNV) were examined with reference to developing selection criteria. Findings revealed that chopper amplifiers with condenser‐coupled input circuits and DC amplifiers with zero‐suppression circuits between stages showed shifts in output level which were the result of changes in resistance of the input circuit. As these artifacts were not negligible with reference to commonly‐reported CNV amplitudes, it was concluded that the two methods should be avoided in recording of low‐level shifts in steady potentials like the CNV.