The Effects Of The Allocation Of Attention Congruent With Lateralized Cognitive Tasks On EEG Coherence Measurements

The single task condition of the Urbanczyk and Kennelly (1991) study was conducted while recording a continuous electroencephalographic (EEG) record. Attention was allocated by instructed lateral head orienting and eye gaze either congruently or incongruently with lateralized cognitive tasks. Thirty university subjects retained a digit span or a spatial location span for a 20 second retention interval. EEG data were extracted from the 20 second retention intervals and interhemispheric coherence was calculated for homologous sites in the temporal, parietal and occipital regions of the brain. There was a main effect for group, with congruent orienting producing greater coherence values than incongruent orienting. This effect of attention on alpha coherence values was found in the low alpha (8-10 Hz) frequency band. This provides evidence that the lower alpha frequency band is reflective of manipulations of attention. The higher coherence measures for the congruent orienting group indicates that homologous regions of the two hemispheres are more coupled into a single system when lateralized attention activates the same hemisphere performing the cognitive task. In the higher alpha frequency band (11-13 Hz) group, sex, site and task interacted. This provides evidence that the higher alpha band is more affected by cognitive processing of the specific task undertaken. An interhemispheric brain system, affected by the lateral orientation of attention, may underlie psychometric intelligence's general “g” ability (Spearman, 1927.)

Grantor dc:publisher

University of North Texas

Year dc:date

2002

Author dc:creator

• Hill, Cynthia DeLeon

Contributors dc:contributor

• Kennelly, Kevin J.
• Uphouse, Lynda
• Herbert, Andrew
• Lambert, Paul

• Attention.
• Electroencephalography.
• temporal region
• EEG
• coherence
• Spearman
• occipital region

Statement dc:rights

• Public
• Copyright
• Hill, Cynthia DeLeon
• Copyright is held by the author, unless otherwise noted. All rights reserved.

Language dc:language

English

Identifier

oclc: 54680541
https://digital.library.unt.edu/ark:/67531/metadc3140/
ark: ark:/67531/metadc3140

OAI identifier oai:identifier

info:ark/67531/metadc3140