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Modulation of brain activity by multiple lexical and word form variables in visual word recognition: A parametric fMRI study.

Abstract：

:Psycholinguistic research has documented a range of variables that influence visual word recognition performance. Many of these variables are highly intercorrelated. Most previous studies have used factorial designs, which do not exploit the full range of values available for continuous variables, and are prone to skewed stimulus selection as well as to effects of the baseline (e.g. when contrasting words with pseudowords). In our study, we used a parametric approach to study the effects of several psycholinguistic variables on brain activation. We focussed on the variable word frequency, which has been used in numerous previous behavioural, electrophysiological and neuroimaging studies, in order to investigate the neuronal network underlying visual word processing. Furthermore, we investigated the variable orthographic typicality as well as a combined variable for word length and orthographic neighbourhood size (N), for which neuroimaging results are still either scarce or inconsistent. Data were analysed using multiple linear regression analysis of event-related fMRI data acquired from 21 subjects in a silent reading paradigm. The frequency variable correlated negatively with activation in left fusiform gyrus, bilateral inferior frontal gyri and bilateral insulae, indicating that word frequency can affect multiple aspects of word processing. N correlated positively with brain activity in left and right middle temporal gyri as well as right inferior frontal gyrus. Thus, our analysis revealed multiple distinct brain areas involved in visual word processing within one data set.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Hauk O,Davis MH,Pulvermüller F

doi

10.1016/j.neuroimage.2008.05.054

subject

Has Abstract

pub_date

2008-09-01 00:00:00

pages

1185-95

issue

3

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(08)00717-9

journal_volume

42

pub_type

杂志文章

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