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All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year Sort by creator [A → Z]' creator [Z → A]' publishing year ↑ (asc)' publishing year ↓ (desc)' title [A → Z]' title [Z → A]' Simple Search Hits 1 – 15 of 15 1 Surviving in the mainstream: Capacity of children with autism spectrum disorders to perform academically and regulate their emotions and behavior at school Ashburner, J.; Ziviani, J.; Rodger, S.. - : Elsevier, 2010 BASE Show details 2 Voxel-based morphometry : the methods Ashburner, J.; Friston, Karl J. In: Cognitive neuroscience (New York, 2009), 1; p. 235-260 MPI für Psycholinguistik 3 Human brain function Frackowiak, Richard S.J.; Friston, Karl J.; Frith, Christopher D.. - Amsterdam [etc.] : Elsevier, 2004 MPI für Psycholinguistik Show details 4 Structural plasticity in the bilingual brain - Proficiency in a second language and age at acquisition affect grey-matter density. Mechelli, A; Crinion, JT; Noppeney, U... In: NATURE , 431 (7010) 757 - 757. (2004) (2004) BASE Show details 5 MRI analysis of an inherited speech and language disorder : structural brain abnormalities Watkins, K.E.; Vargha-Khadem, Faraneh; Ashburner, J.... In: Brain. - Oxford : Oxford Univ. Press 125 (2002) 3, 465-478 BLLDB Show details 6 MRI analysis of an inherited speech and language disorder: structural brain abnormalities. Watkins, KE; Vargha-Khadem, F; Ashburner, J... In: Symplectic Elements at Oxford ; Europe PubMed Central ; PubMed (http://www.ncbi.nlm.nih.gov/pubmed/) ; Web of Science (Lite) (http://apps.webofknowledge.com/summary.do) ; Scopus (http://www.scopus.com/home.url) ; CrossRef (2002) BASE Show details 7 Spatial normalization of brain images with focal lesions using cost function masking Brett, M; Leff, AP; Rorden, C... In: NEUROIMAGE , 14 (2) 486 - 500. (2001) (2001) BASE Show details 8 Assessing study-specific regional variations in fMRI signal Lipschutz, B; Friston, KJ; Ashburner, J... In: NEUROIMAGE , 13 (2) 392 - 398. (2001) (2001) BASE Show details 9 A voxel-based morphometry study of semantic dementia: Relationship between temporal lobe atrophy and semantic memory Mummery, CJ; Patterson, K; Price, CJ... In: ANN NEUROL , 47 (1) 36 - 45. (2000) (2000) BASE Show details 10 Representation of the temporal envelope of sounds in the human brain Giraud, AL; Lorenzi, C; Ashburner, J; Wable, J; Johnsrude, I; Frackowiak, R; Kleinschmidt, A In: J NEUROPHYSIOL , 84 (3) 1588 - 1598. (2000) (2000) Abstract: The cerebral representation of the temporal envelope of sounds was studied in five normal-hearing subjects using functional magnetic resonance imaging. The stimuli were white noise, sinusoidally amplitude-modulated at frequencies ranging from 4 to 256 Hz. This range includes low AM frequencies (up to 32 Hz) essential for the perception of the manner of articulation and syllabic rate, and high AM frequencies (above 64 Hz) essential for the perception of voicing and prosody. The right lower brainstem (superior olivary complex), the right inferior colliculus, the left medial geniculate body, Heschl's gyrus, the superior temporal gyrus, the superior temporal sulcus, and the inferior parietal lobule were specifically responsive to AM. Global tuning curves in these regions suggest that the human auditory system is organized as a hierarchical filter bank, each processing level responding preferentially to a given AM frequency, 256 Hz for the lower brainstem, 32-256 Hz for the inferior colliculus, 16 Hz for the medial geniculate body, 8 Hz for the primary auditory cortex, and 4-8 Hz for secondary regions. The time course of the hemodynamic responses showed sustained and transient components with reverse frequency dependent patterns: the lower the AM frequency the better the fit with a sustained response model, the higher the AM frequency the better the fit with a transient response model. Using cortical maps of best modulation frequency, we demonstrate that the spatial representation of AM frequencies varies according to the response type. Sustained responses yield maps of low frequencies organized in large clusters. Transient responses yield maps of high frequencies represented by a mosaic of small clusters. Very few voxels were tuned to intermediate frequencies (32-64 Hz). We did not find spatial gradients of AM frequencies associated with any response type. Our results suggest that two frequency ranges (up to 16 and 128 Hz and above) are represented in the cortex by different response types. However, the spatial segregation of these two ranges is not systematic. Most cortical regions were tuned to low frequencies and only a few to high frequencies. Yet, voxels that show a preference for low frequencies were also responsive to high frequencies. Overall, our study shows that the temporal envelope of sounds is processed by both distinct (hierarchically organized series of filters) and shared (high and low AM frequencies eliciting different responses at the same cortical locus) neural substrates. This layout suggests that the human auditory system is organized in a parallel fashion that allows a degree of separate routing for groups of AM frequencies conveying different information and preserves a possibility for integration of complementary features in cortical auditory regions. Keyword: AMPLITUDE-MODULATION; BILATERAL LESIONS; COCHLEAR NUCLEUS; CORTICAL FIELDS; INFERIOR COLLICULUS; MODULATION TRANSFER-FUNCTIONS; PRIMARY AUDITORY-CORTEX; PURE WORD DEAFNESS; SPEECH RECEPTION; TIME-COURSE URL: http://discovery.ucl.ac.uk/147909/ BASE Hide details 11 Functional neuroimaging of speech perception in six normal and two aphasic subjects Mummery, C.J.; Ashburner, J.; Scott, S.K.... In: Acoustical Society of America. The journal of the Acoustical Society of America. - Melville, NY : AIP 106 (1999) 1, 449-457 BLLDB Show details 12 Functional neuroimaging of speech perception in six normal and two aphasic subjects Mummery, CJ; Ashburner, J; Scott, SK... In: J ACOUST SOC AM , 106 (1) 449 - 457. (1999) (1999) BASE Show details 13 Functional neuroimaging of speech perception in six normal and two aphasic patients Mummery, C; Scott, S; Ashburner, J... In: Journal of the Acoustical Society of America , 106 (1) pp.449 - 457. (1999) (1999) BASE Show details 14 The critical relationship between the timing of stimulus presentation and data acquisition in blocked designs with fMRI Price, CJ; Veltman, DJ; Ashburner, J... In: NEUROIMAGE , 10 (1) 36 - 44. (1999) (1999) BASE Show details 15 Spatial transformation of images Ashburner, J.; Friston, K.J. In: Human brain function (San Diego, Cal, 1997), p. 43-58 MPI für Psycholinguistik Show details

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