We found that local populations in A1 were highly heterogeneous in the large-scale tonotopic organization. ❋ Gideon Rothschild (2010)
Overall, the results suggest that tonotopic mismatch may affect performance of CI users in complex listening environments. ❋ Callier Library (2010)
We found evidence of reliable mirror-symmetric tonotopic organization in medial auditory cortex that was similar to that previously reported in individual subjects by Formisano and colleagues ❋ Unknown (2009)
In contrast, fMRI studies of the tonotopic organization of human auditory cortex have typically imaged subjects in a single experimental session on activations in auditory cortex, the influence of these variables on tonotopic and non-tonotopic ACFs is not yet fully understood. ❋ Unknown (2009)
Neurophysiological studies have elucidated the functional organization of auditory cortex in non-human primates by mapping tonotopically organized auditory cortical fields (ACFs) and then evaluating the functional specialization of neurons in selected tonotopic and non-tonotopic regions to different stimulus features and task parameters ❋ Unknown (2009)
For example, tonotopic organization was analyzed to tone patterns of different frequency across 36 different task conditions (two tone intensities, three tone locations, continuous vs. sparse image acquisition, and three attention conditions). ❋ Unknown (2009)
Most previous fMRI studies of tonotopic organization have not examined the effect of sound intensity on frequency maps. ❋ Unknown (2009)
Some studies report tonotopic organization primarily in the left hemisphere ❋ Unknown (2009)
Although most whole-brain studies have suggested that the two hemispheres differ in tonotopic organization, the results are inconsistent. ❋ Unknown (2009)
For example, medial ACFs may be more responsive to stimuli with higher intensities and / or higher signal-to-noise ratios than more lateral ACFs In contrast to activations in medial auditory cortex, activations in lateral auditory cortex were uninfluenced by sound intensity, frequency, or image acquisition parameters and showed no evidence of tonotopic organization. ❋ Unknown (2009)
Formisano E, Kim DS, Di Salle F, van de Moortele PF, Ugurbil K, et al. (2003) Mirror-symmetric tonotopic maps in human primary auditory cortex. ❋ Unknown (2009)
The goal of the current experiment was to clarify the functional organization of human auditory cortex by mapping its tonotopic organization while simultaneously manipulating the intensity, spatial location and attentional relevance of auditory signals. ❋ Unknown (2009)
Figure 14 shows a schematic model of these fields superimposed on the grand mean tonotopic maps from the current study using a model similar to models of macaque auditory cortex A schematic model of human auditory cortical fields. ❋ Unknown (2009)
The tonotopic distributions for individual subjects are shown in Tonotopic organization of auditory cortex in each of the nine individual subjects. ❋ Unknown (2009)
They found evidence for two mirror-symmetric tonotopic maps encompassing the aforementioned three frequency-specific regions - the first connected a high-frequency region in HS with a low-frequency region in mid-HG and the second connected the same low-frequency region with a high-frequency region near the junction of HG and the superior temporal gyrus (STG). ❋ Unknown (2009)
Studies of tonotopic organization have revealed that the anatomical locations of frequency-specific regions have a coarse but consistent relationship to local anatomical landmarks in individual subjects ❋ Unknown (2009)
Field borders were estimated based on similarities in tonotopic organization observed in the current study and in fMRI studies of macaque auditory cortex (Petkov et al. 2006, Kayser et al. 2007). ❋ Unknown (2009)
Traditionally, Cochlear Implants were designed to stimulate the middle ear Cochlear that is tonotopic. ❋ Unknown (2009)
While previous studies that have variously failed to find tonotopic organization in the right ❋ Unknown (2009)
The first objective of the current study was to visualize the basic tonotopic organization of human auditory cortex. ❋ Unknown (2009)
