Marina Papoutsi PhD

Marina Papoutsi


Publications:
2009
  From Phonemes to Articulatory Codes: An fMRI Study of the Role of Broca's Area in Speech Production
Papoutsi, M, de Zwart, JA, Jansma, JM, Pickering, MJ, Bednar, JA & Horwitz, B 2009, 'From Phonemes to Articulatory Codes: An fMRI Study of the Role of Broca's Area in Speech Production' Cerebral Cortex, vol 19, no. 9, pp. 2156-2165. DOI: 10.1093/cercor/bhn239
We used event-related functional magnetic resonance imaging to investigate the neuroanatomical substrates of phonetic encoding and the generation of articulatory codes from phonological representations. Our focus was on the role of the left inferior frontal gyrus (LIFG) and in particular whether the LIFG plays a role in sublexical phonological processing such as syllabification or whether it is directly involved in phonetic encoding and the generation of articulatory codes. To answer this question, we contrasted the brain activation patterns elicited by pseudowords with high- or low-sublexical frequency components, which we expected would reveal areas related to the generation of articulatory codes but not areas related to phonological encoding. We found significant activation of a premotor network consisting of the dorsal precentral gyrus, the inferior frontal gyrus bilaterally, and the supplementary motor area for low- versus high-sublexical frequency pseudowords. Based on our hypothesis, we concluded that these areas and in particular the LIFG are involved in phonetic and not phonological encoding. We further discuss our findings with respect to the mechanisms of phonetic encoding and provide evidence in support of a functional segregation of the posterior part of Broca's area, the pars opercularis.
General Information
Organisations: Institute for Adaptive and Neural Computation .
Authors: Papoutsi, Marina, de Zwart, J. A., Jansma, J. M., Pickering, M. J., Bednar, J. A. & Horwitz, B..
Keywords: (articulation, fMRI , left inferior frontal gyrus , pars opercularis , phonological processing, , , . )
Number of pages: 10
Pages: 2156-2165
Publication Date: Sep 2009
Publication Information
Category: Article
Journal: Cerebral Cortex
Volume: 19
Issue number: 9
ISSN: 1047-3211
Original Language: English
DOIs: 10.1093/cercor/bhn239
2007
  The Processing of low frequency pseudowords by Broca's area
Papoutsi, M, de Zwart, JA, Jansma, JM, Pickering, M, Bednar, JA & Horowitz, B 2007, 'The Processing of low frequency pseudowords by Broca's area' Neuroscience Day, Royal College of Physicians, Edinburgh, United Kingdom, 19/03/07 - 19/03/07, .
General Information
Organisations: Institute for Adaptive and Neural Computation .
Authors: Papoutsi, Marina, de Zwart, J. A., Jansma, J. M., Pickering, Martin, Bednar, James A. & Horowitz, B..
Publication Date: 2007
Publication Information
Category: Poster
Original Language: English
  The Processing of low frequency pseudowords by Broca's area
Papoutsi, M, de Zwart, JA, Jansma, JM, Pickering, M, Bednar, JA & Horowitz, B 2007, The Processing of low frequency pseudowords by Broca's area. in Organisation for Human Brain Mapping, 13th Annual Meeting, Chicago, USA.
General Information
Organisations: Institute for Adaptive and Neural Computation .
Authors: Papoutsi, Marina, de Zwart, J. A., Jansma, J. M., Pickering, Martin, Bednar, James A. & Horowitz, B..
Publication Date: 2007
Publication Information
Category: Conference contribution
Original Language: English
2006
  Re-evaluating Magnetic Source MRI
Papoutsi, M & Marshall, I 2006, 'Re-evaluating Magnetic Source MRI' 12th Annual Meeting of the Organization for Human Brain Mapping, Florence, Italy, 11/06/06 - 15/06/06, .
General Information
Organisations: Centre for Clinical Brain Sciences.
Authors: Papoutsi, Marina & Marshall, Ian.
Publication Date: 2006
Publication Information
Category: Poster
Original Language: English

Projects:
Phonetic Encoding, Verbal Working Memory and the Role of Brocas Area (PhD)