نتایج جستجو برای: primary auditory cortex

تعداد نتایج: 824338  

Journal: :Cerebral cortex 2005
Mohamed L Seghier Colette Boëx François Lazeyras Alain Sigrist Marco Pelizzone

To investigate the activation of the auditory cortex by fMRI, three deaf subjects users of the Ineraid cochlear implant participated in our study. Possible interference between fMRI acquisition and the implanted electrodes was controlled and safe experimental conditions were obtained. For each subject, electrical stimuli were applied on different intracochlear electrodes, in monopolar mode. Sti...

Journal: :Psychological bulletin 2007
Joel S Snyder Claude Alain

Auditory stream segregation (or streaming) is a phenomenon in which 2 or more repeating sounds differing in at least 1 acoustic attribute are perceived as 2 or more separate sound sources (i.e., streams). This article selectively reviews psychophysical and computational studies of streaming and comprehensively reviews more recent neurophysiological studies that have provided important insights ...

2011
Edward L. Bartlett Srivatsun Sadagopan Xiaoqin Wang

23 The frequency resolution of auditory neurons throughout the ascending auditory pathway 24 is an important parameter for understanding how sounds are processed. It has been shown in 25 previous animal studies that the frequency tuning widths are about 1/5 octave wide in auditory 26 nerve fibers and much wider in auditory cortex neurons (Pickles, 1979; McLaughlin et al., 2008; 27 see Table 1)....

Journal: :Cerebral cortex 2011
Antonia Reimer Peter Hubka Andreas K Engel Andrej Kral

Central processing of acoustic signals is assumed to take place in a stereotypical spatial and temporal pattern involving different fields of auditory cortex. So far, cortical propagating waves representing such patterns have mainly been demonstrated by optical imaging, repeatedly in the visual and somatosensory cortex. In this study, the surface of rat auditory cortex was mapped by recording l...

Journal: :Journal of neurophysiology 2002
Mark Jude Tramo Gaurav D Shah Louis D Braida

Microelectrode studies in nonhuman primates and other mammals have demonstrated that many neurons in auditory cortex are excited by pure tone stimulation only when the tone's frequency lies within a narrow range of the audible spectrum. However, the effects of auditory cortex lesions in animals and humans have been interpreted as evidence against the notion that neuronal frequency selectivity i...

Journal: :Journal of neurophysiology 2012
Tobias Overath Yue Zhang Dan H Sanes David Poeppel

Hierarchical models of auditory processing often posit that optimal stimuli, i.e., those eliciting a maximal neural response, will increase in bandwidth and decrease in modulation rate as one ascends the auditory neuraxis. Here, we tested how bandwidth and modulation rate interact at several loci along the human central auditory pathway using functional MRI in a cardiac-gated, sparse acquisitio...

Journal: :Brain research 1991
M A Nicolelis J K Chapin R C Lin

A normally transient cross-modal thalamocortical projection from the magnocellular subdivision of the medial geniculate nucleus (MGm) to the primary somatosensory (SI) cortex of rats was found to remain unchanged throughout adulthood following unilateral removal of whiskers in newborn animals. The normal MGm projection to the auditory cortex is not lost in these neonatally whisker-deprived adul...

Journal: :Neuron 2015
Sam Norman-Haignere Nancy G. Kanwisher Josh H. McDermott

The organization of human auditory cortex remains unresolved, due in part to the small stimulus sets common to fMRI studies and the overlap of neural populations within voxels. To address these challenges, we measured fMRI responses to 165 natural sounds and inferred canonical response profiles ("components") whose weighted combinations explained voxel responses throughout auditory cortex. This...

2013
Craig D. Markovitz Tien T. Tang Hubert H. Lim

Descending projections from the cortex to subcortical structures are critical for auditory plasticity, including the ability for central neurons to adjust their frequency tuning to relevant and meaningful stimuli. We show that focal electrical stimulation of primary auditory cortex in guinea pigs produces excitatory responses in the central nucleus of the inferior colliculus (CNIC) with two ton...

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