Abstract #4631

Dorsal-ventral stream development for visual word processing

Sunita Gudwani^1,2, S. Senthil Senthil Kumaran³, Rajesh Sagar⁴, Madhuri Behari⁵, Manju Mehta⁶, Vaishna Narang⁷, SN Dwivedi⁸, and NR Jagannathan³

¹Department of ENT, Escorts Heart Institute and Research Center, New Delhi, India, ²Former Department of NMR and MRI Facility, Former ALL INSTITUTE OF MEDICAL SCIENCES, NEW DELHI, India, ³Department of NMR and MRI Facility, All India Institute of Medical Sciences, New Delhi, India, ⁴Department of Psychiatry, All India Institute of Medical Sciences, New Delhi, India, ⁵Department of Neurology, Fortis Hospital, New Delhi, India, ⁶Department of Psychiatry (Psychology Unit), All India Institute of Medical Sciences, New Delhi, India, ⁷Department of Linguistics, School of Language, Jawahar Lal Nehru University, New Delhi, India, ⁸Department of Biostatistics, All India Institute of Medical Sciences, New Delhi, India

Reading skill is window to the world that we acquire with development. Dual-route model predicts our proficiency of grapheme (text) to phoneme (sound) conversion and semantic decoding (understanding content) for visual words. Fast processing by frontoparietal pathway while meaningful word reading but lexical decision to pseudowords proceeds slowly and exhaustively. Pseudoword successful orthographic mapping recruits ventral and then dorsal areas. This phonological proficiency and exhaustive mental lexicon search during reading is automatized with skill development. Current study evidences recruitment of inferior frontal gyrus (BA44 and 45), insula, thalamus, caudate nucleus and cortical reorganizations of skill developmental with age

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