Brain activity during reading the effects of exposure duration and task

C. J. Price*, R. J.S. Wise, J. D.G. Watson, K. Patterson, D. Howard, R. S.J. Frackowiak

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

365 Citations (Scopus)

Abstract

Brain activity during reading tasks was investigated using PET. The aim was to account for differences in the results of two previous studies [those of Petersen et al. (Science 1990; 249: 1041-4) and Howard et al. (Brain 1992; 115: 1769-82)] by systematically varying the type of reading task and the exposure duration of the word stimuli. Both variables strongly influenced patterns of brain activity. There were three types of task: (i) reading aloud; (ii) reading silently; and (Hi) lexical decision on visually presented words and pseudowords. Reading aloud and reading silently engaged the left middle and superior temporal regions, confirming the important role of these areas in visual word processing.The areas principally engaged during lexical decision were the left inferior and middle frontal cortices and the supplementary motor area; activity in these areas suggests that the subjects were using a phonological strategy to perform the task. There was also a significant effect of exposure duration, with activity being greater for short (150 ms) exposure durations than for long (1000 ms or 981 ms) exposure durations. We conclude that until we understand how subtle variations in experimental design influence brain activity during reading tasks, the association of specific processing functions with individual anatomical areas activated during reading is premature.

Original languageEnglish
Pages (from-to)1255-1269
Number of pages15
JournalBrain
Volume117
Issue number6
DOIs
Publication statusPublished - Dec 1994
Externally publishedYes

Keywords

  • Exposure duration
  • PET
  • Reading
  • Task

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