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Brain Topography
Published in: Brain Topography 4/2018

01-07-2018 | Original Paper

An Eye Fixation-Related Potential Study in Two Reading Tasks: Reading to Memorize and Reading to Make a Decision

Authors: Aline Frey, Benoît Lemaire, Laurent Vercueil, Anne Guérin-Dugué

Published in: Brain Topography | Issue 4/2018

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Abstract

We investigated how two different reading tasks, namely reading to memorize [Read & Memorize (RM)] and reading to decide whether a text was relevant to a given topic [Read & Decide (RD)], modulated both eye movements (EM) and brain activity. To this end, we set up an ecological paradigm using the eye fixation-related potentials (EFRP) technique, in which participants freely moved their eyes to process short paragraphs, while their electroencephalography (EEG) activity was recorded in synchronization with their EM. A general linear model was used to estimate at best EFRP, taking account of the overlap between adjacent potentials, and more precisely with the potential elicited at text onset, as well as saccadic potentials. Our results showed that EM patterns were top-down modulated by different task demands. More interestingly, in both tasks, we observed slow-wave potentials that gradually increased across the first eye fixations. These slow waves were larger in the RD task than in the RM task, specifically over the left hemisphere. These results suggest that the decision-making process during reading in the RD task engendered a greater memory load in working memory than that generated in a classic reading task. The significance of these findings is discussed in the light of recent theories and models of working memory processing.
Appendix
Available only for authorised users
Footnotes
1
The interval between the offset of a fixation and the onset of the following one (thus including the duration of the fixation plus the saccade).
 
2
A median value was a more suitable indicator than a mean value, owing to the asymmetrical distribution.
 
3
Each epoch started 100 ms before text onset and ended 1050 (RD) or 1150 (RM) ms after text offset (see “Appendix 2”).
 
4
For t > 0 and < 202 (RM) or 169 (RD) ms, corresponding to the mean duration of the first fixation (Table 1).
 
5
By definition, a Toeplitz matrix is a descending diagonal-constant matrix.
 
6
The number of samples is the duration of the time interval multiplied by the sampling frequency.
 
7
700 ms is the usual duration for this transient response.
 
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Metadata
Title
An Eye Fixation-Related Potential Study in Two Reading Tasks: Reading to Memorize and Reading to Make a Decision
Authors
Aline Frey
Benoît Lemaire
Laurent Vercueil
Anne Guérin-Dugué
Publication date
01-07-2018
Publisher
Springer US
Published in
Brain Topography / Issue 4/2018
Print ISSN: 0896-0267
Electronic ISSN: 1573-6792
DOI
https://doi.org/10.1007/s10548-018-0629-8

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