Effect of high latitude on the variability of human event-related brain potentials
Dissertation (Ph.D.) University of Alaska Fairbanks, 1993 European researchers (Anderson, Chambers, Myhre, Nicholson, & Stone, 1984) at 69 degrees north latitude, have reported seasonal changes in the human electroencephalogram, EEG. Other researchers from the North American mid-latitudes (Deldi...
Main Author: | |
---|---|
Other Authors: | , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | unknown |
Published: |
1993
|
Subjects: | |
Online Access: | http://hdl.handle.net/11122/9366 |
id |
ftunivalaska:oai:scholarworks.alaska.edu:11122/9366 |
---|---|
record_format |
openpolar |
spelling |
ftunivalaska:oai:scholarworks.alaska.edu:11122/9366 2023-05-15T18:28:35+02:00 Effect of high latitude on the variability of human event-related brain potentials Bush, Anita Marie Geist, Charles R. Barnes, Brian M. Connor, William Ebbesson, Sven O. Emery, Scott Murphy, Edward C. 1993 http://hdl.handle.net/11122/9366 unknown http://hdl.handle.net/11122/9366 Neurosciences Physiological psychology Dissertation phd 1993 ftunivalaska 2023-02-23T21:37:15Z Dissertation (Ph.D.) University of Alaska Fairbanks, 1993 European researchers (Anderson, Chambers, Myhre, Nicholson, & Stone, 1984) at 69 degrees north latitude, have reported seasonal changes in the human electroencephalogram, EEG. Other researchers from the North American mid-latitudes (Deldin, Duncan, & Miller, 1989a, 1989b), using event-related brain potentials, ERPs, have reported changes associated with ambient light. Similar changes in the event-related brain potentials of humans have not been reported from the high latitudes nor by longitudinal methods. This dissertation longitudinally investigated ERP variability in normal humans living at high latitude. One hundred and twelve residents of Fairbanks, Alaska participated in single-trial ERP testing, both auditory and visual, to evaluate criteria of validity and reliability. Subsequently, eight normal humans participated in auditory and visual ERP testing every month for twelve consecutive months. The longitudinally-studied subjects were residents of the Alaskan subarctic, where testing occurred, and each experienced naturally-occuring photoperiod variability of 3.31 hours in December to 21.98 hours in June. Dependent variables included P3 amplitude and latency in both sensory modalities. Independent variables included: age, estimated cranial volume, length of last sleep epoch, subjective wakefulness, ambient photoperiod, and ambient geomagnetic field. Distribution of the longitudinal ERP data satisfied Shapiro-Wilke criteria for normality. The GLM-ANOVA for ordered repeated measures was used and a month effect was observed in P3 amplitude and latency, as well as a month-by-sensory mode interaction. The principal components method of factor analysis evaluated the factor weights of the independent variables. Variables unique to each subject (e.g., age, cranial volume, length of last sleep) were more heavily weighted in the first factor. The environmental variables became heavily weighted in the second factor, and descriptors of the earth's ... Doctoral or Postdoctoral Thesis Subarctic Alaska University of Alaska: ScholarWorks@UA Fairbanks Nicholson ENVELOPE(78.236,78.236,-68.612,-68.612) |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
unknown |
topic |
Neurosciences Physiological psychology |
spellingShingle |
Neurosciences Physiological psychology Bush, Anita Marie Effect of high latitude on the variability of human event-related brain potentials |
topic_facet |
Neurosciences Physiological psychology |
description |
Dissertation (Ph.D.) University of Alaska Fairbanks, 1993 European researchers (Anderson, Chambers, Myhre, Nicholson, & Stone, 1984) at 69 degrees north latitude, have reported seasonal changes in the human electroencephalogram, EEG. Other researchers from the North American mid-latitudes (Deldin, Duncan, & Miller, 1989a, 1989b), using event-related brain potentials, ERPs, have reported changes associated with ambient light. Similar changes in the event-related brain potentials of humans have not been reported from the high latitudes nor by longitudinal methods. This dissertation longitudinally investigated ERP variability in normal humans living at high latitude. One hundred and twelve residents of Fairbanks, Alaska participated in single-trial ERP testing, both auditory and visual, to evaluate criteria of validity and reliability. Subsequently, eight normal humans participated in auditory and visual ERP testing every month for twelve consecutive months. The longitudinally-studied subjects were residents of the Alaskan subarctic, where testing occurred, and each experienced naturally-occuring photoperiod variability of 3.31 hours in December to 21.98 hours in June. Dependent variables included P3 amplitude and latency in both sensory modalities. Independent variables included: age, estimated cranial volume, length of last sleep epoch, subjective wakefulness, ambient photoperiod, and ambient geomagnetic field. Distribution of the longitudinal ERP data satisfied Shapiro-Wilke criteria for normality. The GLM-ANOVA for ordered repeated measures was used and a month effect was observed in P3 amplitude and latency, as well as a month-by-sensory mode interaction. The principal components method of factor analysis evaluated the factor weights of the independent variables. Variables unique to each subject (e.g., age, cranial volume, length of last sleep) were more heavily weighted in the first factor. The environmental variables became heavily weighted in the second factor, and descriptors of the earth's ... |
author2 |
Geist, Charles R. Barnes, Brian M. Connor, William Ebbesson, Sven O. Emery, Scott Murphy, Edward C. |
format |
Doctoral or Postdoctoral Thesis |
author |
Bush, Anita Marie |
author_facet |
Bush, Anita Marie |
author_sort |
Bush, Anita Marie |
title |
Effect of high latitude on the variability of human event-related brain potentials |
title_short |
Effect of high latitude on the variability of human event-related brain potentials |
title_full |
Effect of high latitude on the variability of human event-related brain potentials |
title_fullStr |
Effect of high latitude on the variability of human event-related brain potentials |
title_full_unstemmed |
Effect of high latitude on the variability of human event-related brain potentials |
title_sort |
effect of high latitude on the variability of human event-related brain potentials |
publishDate |
1993 |
url |
http://hdl.handle.net/11122/9366 |
long_lat |
ENVELOPE(78.236,78.236,-68.612,-68.612) |
geographic |
Fairbanks Nicholson |
geographic_facet |
Fairbanks Nicholson |
genre |
Subarctic Alaska |
genre_facet |
Subarctic Alaska |
op_relation |
http://hdl.handle.net/11122/9366 |
_version_ |
1766211116754534400 |