Cognitive Event Related Potentials During a Leanring Task
Cognitive Event Related Potentials During a Leanring Task
This work examines the hypothesis that there are scalp recorded brain potentials in 99 healthy subjects learning a task.
Recording was by using cap electrodes with linked mastoids as reference. The volunteers were asked to observe a series of two hundred different images obeyed the rule for two patterns A and B, which had been generated by computer program and displayed randomly on a screen of 2sec and the screen was blank for 2sec. The images were classed according to the subject's decision by pressing one of two buttons. One subject group was told the nature of the task beforehand, some groups had feedback for correct/incorrect answers and a control group simply observed the screen. Performance was monitored by the CUSUM quality control method. Learners were clearly distinct from non-learners.
Observers showed no significant electrical activity after the initial visual evoked potential, which ended at about 200msec. Learners showed a Positivity Associated with Learning (PAL) whether they learned or not. The PAL began at 200msec and lasted up to 2000msec. It was distributed over the frontal lobes but greater on the right side. Amplitude was about 6 μν and long lasting with no clear peak.
In general, the better the performance, the greater the positivity. Positivity increased towards the end of a successful learning session. Non-learners showed a similar positivity of lower amplitude. Positivity was greater after a single successful trial than after an incorrect answer. Our work gives temporal information and association between the potentials and subjects performance. It is proposed that similar studies will be useful in determining the pathophysiology of learning difficulties.
University of Southampton
Fath El-Bab, Mohamed
0dbb168f-ffcf-4d9d-88c2-cd3f4bd1b74b
2001
Fath El-Bab, Mohamed
0dbb168f-ffcf-4d9d-88c2-cd3f4bd1b74b
Fath El-Bab, Mohamed
(2001)
Cognitive Event Related Potentials During a Leanring Task.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
This work examines the hypothesis that there are scalp recorded brain potentials in 99 healthy subjects learning a task.
Recording was by using cap electrodes with linked mastoids as reference. The volunteers were asked to observe a series of two hundred different images obeyed the rule for two patterns A and B, which had been generated by computer program and displayed randomly on a screen of 2sec and the screen was blank for 2sec. The images were classed according to the subject's decision by pressing one of two buttons. One subject group was told the nature of the task beforehand, some groups had feedback for correct/incorrect answers and a control group simply observed the screen. Performance was monitored by the CUSUM quality control method. Learners were clearly distinct from non-learners.
Observers showed no significant electrical activity after the initial visual evoked potential, which ended at about 200msec. Learners showed a Positivity Associated with Learning (PAL) whether they learned or not. The PAL began at 200msec and lasted up to 2000msec. It was distributed over the frontal lobes but greater on the right side. Amplitude was about 6 μν and long lasting with no clear peak.
In general, the better the performance, the greater the positivity. Positivity increased towards the end of a successful learning session. Non-learners showed a similar positivity of lower amplitude. Positivity was greater after a single successful trial than after an incorrect answer. Our work gives temporal information and association between the potentials and subjects performance. It is proposed that similar studies will be useful in determining the pathophysiology of learning difficulties.
Text
814737.pdf
- Version of Record
More information
Published date: 2001
Identifiers
Local EPrints ID: 464498
URI: http://eprints.soton.ac.uk/id/eprint/464498
PURE UUID: 927a4ef4-50cd-43f9-833e-389c08d87a1c
Catalogue record
Date deposited: 04 Jul 2022 23:42
Last modified: 16 Mar 2024 19:33
Export record
Contributors
Author:
Mohamed Fath El-Bab
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics