Dichotic listening in patients with splenial and nonsplenial callosal lesions.

The authors found splenial lesions to be associated with left ear suppression in dichotic listening of consonant-vowel syllables. This was found in both a rapid presentation dichotic monitoring task and a standard dichotic listening task, ruling out attentional limitations in the processing of high stimulus loads as a confounding factor. Moreover, directed attention to the left ear did not improve left ear target detection in the patients, independent of callosal lesion location. The authors' data may indicate that auditory callosal fibers pass through the splenium more posterior than previously thought. However, further studies should investigate whether callosal fibers between primary and secondary auditory cortices, or between higher level multimodal cortices, are vital for the detection of left ear targets in dichotic listening.

[1]  M. Sugishita,et al.  Dichotic listening in patients with partial section of the corpus callosum. , 1995, Brain : a journal of neurology.

[2]  G. Geffen,et al.  Hemispheric specialization and attention: Effects of complete and partial callosal section and hemispherectomy on dichotic monitoring , 1986, Neuropsychologia.

[3]  K. Hugdahl,et al.  Dichotic listening performance in relation to callosal area on the MRI scan. , 1994 .

[4]  P Kapeller,et al.  MRI evidence of past cerebral microbleeds in a healthy elderly population , 1999, Neurology.

[5]  M. Alexander,et al.  Localization of callosal auditory pathways , 1988, Neurology.

[6]  R. C. Oldfield.  The assessment and analysis of handedness: the Edinburgh inventory. , 1971, Neuropsychologia.

[7]  Ravi S. Menon,et al.  Imaging at high magnetic fields: initial experiences at 4 T. , 1993, Magnetic resonance quarterly.

[8]  D. Kimura.  Cerebral dominance and the perception of verbal stimuli. , 1961 .

[9]  K. Uğurbil,et al.  High contrast and fast three‐dimensional magnetic resonance imaging at high fields , 1995, Magnetic resonance in medicine.

[10]  N. Geschwind,et al.  Dichotic Listening in Man after Section of Neocortical Commissures , 1968 .

[11]  P. B. Cipolloni,et al.  Topography and trajectories of commissural fibers of the superior temporal region in the rhesus monkey , 2004, Experimental Brain Research.

[12]  D. Broadbent.  The role of auditory localization in attention and memory span. , 1954, Journal of experimental psychology.

[13]  B Milner,et al.  Lateralized Suppression of Dichotically Presented Digits after Commissural Section in Man , 1968, Science.

[14]  E. Ross,et al.  Topography of the Human Corpus Callosum , 1985, Journal of neuropathology and experimental neurology.

[15]  P Kapeller,et al.  Histopathologic analysis of foci of signal loss on gradient-echo T2*-weighted MR images in patients with spontaneous intracerebral hemorrhage: evidence of microangiopathy-related microbleeds. , 1999, AJNR. American journal of neuroradiology.

[16]  Gabriele Lohmann,et al.  Brain (Brain image analysis) - A toolkit for the analysis of multimodal brain datasets , 1996 .

[17]  M. Gazzaniga,et al.  Dichotic testing of partial and complete split brain subjects , 1975, Neuropsychologia.

[18]  R. C. Oldfield.  THE ASSESSMENT AND ANALYSIS OF HANDEDNESS , 1971 .