Neurophysiological signs of rapidly emerging visual expertise for symbol strings

Silvia Brem · Anette Lang-Dullenkopf · Urs Maurer · Pascal Halder · Kerstin Bücher · Daniel Brandeis

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Reading and Literacy Development Visual perception and processing mechanisms Face Recognition and Perception

Abstract

The current study examined whether the repeated visual presentation of novel, meaningless symbol strings triggers rapid changes in event related potentials (ERP). Adult participants performed three versions of a word and symbol string repetition detection task in the same experimental session. Analyses focussed on the occipito-temporal N1 (approximately 150 ms) known to reflect early word-specific processing and stimulus categorisation. While the N1 to words did not change, the occipito-temporal negativity to symbol strings increased over runs and converged with the word N1. Later (approximately 220 ms) more positive occipito-temporal amplitudes to repeated words in the third compared to the first run implied a repetition priming effect. This suggests that symbol string processing changed over time due to visual learning and increased perceptual expertise.

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References

1999Dynamics of letter string perception in the human occipitotemporal cortex 1999Dissociation of Normal Feature Analysis and Deficient Processing of Letter-strings in Dyslexic Adults 2003The time course of brain activity in reading English and Chinese: An ERP study of Chinese bilinguals 1987Event-related potentials and the interaction between orthographic and phonological information in a rhyme-judgment task

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