TY - JOUR
T1 - Electroencephalographic Registration of Low Concentrations of Isoamyl Acetate
AU - Kline, John P.
AU - Schwartz, Gary E.
AU - Dikman, Ziya V.
AU - Bell, Iris R.
N1 - Funding Information:
This work was supported by a postdoctoral fellowship to John Kline by RAM Research LTD, England. Portions of this work were presented at the 1997 meeting of the Association for the Scientific Study of Consciousness in Claremont, California, and at the 37th annual meeting of the Society for Psychophysiological Research in North Falmouth, Massachusetts. The authors acknowledge the technical and methodological advice or Ernest Polak; criticisms and comments of Lynn Nadel, Bruce Mangan, Larry Jacoby, Tyler Lorig, Bill Banks, and an anonymous reviewer; and the assistance of Lynn Myers, Patricia Gulli, and Doug Streibich in data collection.
PY - 2000/3
Y1 - 2000/3
N2 - Previous research has demonstrated electroencephalogram (EEG) changes in response to low-odor concentrations, resulting in near-chance detection. Such findings have been taken as evidence for olfaction without awareness. We replicated and extended previous work by examining EEG responses to water-water control, 0.0001, 0.001, 0.01, and 1 ppm isoamyl acetate (IAA) in water paired with water only. Detection was above chance (>50%) for .001 and above, and alpha decreased only to those concentrations, suggesting that EEG changes corresponded to IAA awareness. However, when correct trial EEGs were compared to incorrect trial EEGs during .001 ppm, right posterior/central alpha decreased during incorrect trials and alpha decreased more globally (including frontal sites) during correct trials. These data may not reflect awareness or unawareness per se. Instead, results are discussed regarding activation of perceptual systems in the posterior region during incorrect trials and the activation of frontal action systems during a subset of correct trials.
AB - Previous research has demonstrated electroencephalogram (EEG) changes in response to low-odor concentrations, resulting in near-chance detection. Such findings have been taken as evidence for olfaction without awareness. We replicated and extended previous work by examining EEG responses to water-water control, 0.0001, 0.001, 0.01, and 1 ppm isoamyl acetate (IAA) in water paired with water only. Detection was above chance (>50%) for .001 and above, and alpha decreased only to those concentrations, suggesting that EEG changes corresponded to IAA awareness. However, when correct trial EEGs were compared to incorrect trial EEGs during .001 ppm, right posterior/central alpha decreased during incorrect trials and alpha decreased more globally (including frontal sites) during correct trials. These data may not reflect awareness or unawareness per se. Instead, results are discussed regarding activation of perceptual systems in the posterior region during incorrect trials and the activation of frontal action systems during a subset of correct trials.
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U2 - 10.1006/ccog.1999.0422
DO - 10.1006/ccog.1999.0422
M3 - Article
C2 - 10753493
AN - SCOPUS:0034154695
SN - 1053-8100
VL - 9
SP - 50
EP - 65
JO - Consciousness and Cognition
JF - Consciousness and Cognition
IS - 1
ER -