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1
The signer and the sign: Cortical correlates of person identity and language processing from point-light displays
In: Neuropsychologia , 49 (11) 3018 - 3026. (2011) (2011)
Abstract: In this study, the first to explore the cortical correlates of signed language (SL) processing under point-light display conditions, the observer identified either a signer or a lexical sign from a display in which different signers were seen producing a number of different individual signs. many of the regions activated by point-light under these conditions replicated those previously reported for full-image displays, including regions within the inferior temporal cortex that are specialised for face and body-part identification, although such body parts were invisible in the display. Right frontal regions were also recruited - a pattern not usually seen in full-image SL processing. This activation may reflect the recruitment of information about person identity from the reduced display. A direct comparison of identify-signer and identify-sign conditions showed these tasks relied to a different extent on the posterior inferior regions. Signer identification elicited greater activation than sign identification in (bilateral) inferior temporal gyri (BA 37/19), fusiform gyri (BA 37), middle and posterior portions of the middle temporal gyri (BAs 37 and 19), and superior temporal gyri (BA 22 and 42). Right inferior frontal cortex was a further focus of differential activation (signer > sign).These findings suggest that the neural systems supporting point-light displays for the processing of SL rely on a cortical network including areas of the inferior temporal cortex specialized for face and body identification. While this might be predicted from other studies of whole body point-light actions (Vaina, Solomon, Chowdhury, Sinha, & Belliveau, 2001) it is not predicted from the perspective of spoken language processing, where voice characteristics and speech content recruit distinct cortical regions (Stevens, 2004) in addition to a common network. In this respect, our findings contrast with studies of voice/speech recognition (Von Kriegstein, Kleinschmidt, Sterzer, & Giraud, 2005). Inferior temporal regions associated with the visual recognition of a person appear to be required during SL processing, for both carrier and content information. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
Keyword: Biological motion perception; BRAIN-AREAS; DEAF SUBJECTS; fMRI; INTRAPARIETAL SULCUS; MIRROR NEURON SYSTEM; Point-light; RECOGNITION; RECOGNIZING FRIENDS; Sign language; VISIBLE SPEECH; VISUAL-PERCEPTION
URL: http://discovery.ucl.ac.uk/1319006/
http://discovery.ucl.ac.uk/1319006/1/1319006.pdf
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2
Superior temporal activation as a function of linguistic knowledge: Insights from deaf native signers who speechread
In: BRAIN LANG , 112 (2) 129 - 134. (2010) (2010)
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3
Hand and mouth: Cortical correlates of lexical processing in British Sign Language and speechreading English
In: J COGNITIVE NEUROSCI , 20 (7) 1220 - 1234. (2008) (2008)
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4
Cortical circuits for silent speechreading in deaf and hearing people
In: NEUROPSYCHOLOGIA , 46 (5) 1233 - 1241. (2008) (2008)
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5
The processing of audio-visual speech: empirical and neural bases
In: PHILOS T R SOC B , 363 (1493) 1001 - 1010. (2008) (2008)
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6
Fingerspelling, signed language, text and picture processing in deaf native signers: The role of the mid-fusiform gyrus
In: NEUROIMAGE , 35 (3) 1287 - 1302. (2007) (2007)
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7
Lexical and sentential processing in British sign language
In: HUM BRAIN MAPP , 27 (1) 63 - 76. (2006) (2006)
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8
Dissociating linguistic and nonlinguistic gestural communication in the brain
In: NEUROIMAGE , 22 (4) 1605 - 1618. (2004) (2004)
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9
Reading speech from still and moving faces: The neural substrates of visible speech
In: J COGNITIVE NEUROSCI , 15 (1) 57 - 70. (2003) (2003)
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10
The classification of 'fear' from faces is associated with face recognition skill in women
In: NEUROPSYCHOLOGIA , 40 (6) 575 - 584. (2002) (2002)
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11
Neural systems underlying British Sign Language and audio-visual English processing in native users
In: BRAIN , 125 1583 - 1593. (2002) (2002)
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12
Audio-visual speech perception in schizophrenia: an fMRI study
In: PSYCHIAT RES-NEUROIM , 106 (1) 1 - 14. (2001) (2001)
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13
Silent speechreading in the absence of scanner noise: an event-related fMRI study
In: NEUROREPORT , 11 (8) 1729 - 1733. (2000) (2000)
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