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Intrahemispheric White Matter Asymmetries and Interhemispheric Connections Underlying the Lateralization of Language Production and Spatial Attention in Left-Handers.
Neurobiol Lang (Camb)
January 2025
Key Laboratory of Brain Functional Genomics (MOE & STCSM), Shanghai Changning-ECNU Mental Health Center, School of Psychology and Cognitive Science, East China Normal University, Shanghai, China.
Leftward language production and rightward spatial attention are salient features of functional organization in most humans, but their anatomical basis remains unclear. Interhemispheric connections and intrahemispheric white matter asymmetries have been proposed as important factors underlying functional lateralization. To investigate the role of white matter connectivity in functional lateralization, we first identified 96 left-handers using visual half field naming tasks.
View Article and Find Full Text PDFMicrostructural Degeneration of the Corpus Callosum in Parkinson's Disease with Unilateral Onset: A Free-Water Imaging Study.
ACS Chem Neurosci
January 2025
Department of Radiology, The Second Affiliated Hospital, Zhejiang University of Medicine, Hangzhou 310009, China.
Article Synopsis
- Motor symptom laterality in Parkinson's Disease (PD) impacts both motor and nonmotor symptoms, potentially altering patient prognosis, with compensatory mechanisms in the brain's dominant hemisphere playing a key role.
- This study investigated the microstructural changes in the corpus callosum (CC), the brain's main connector between hemispheres, in 201 right-handed PD patients (split between left- and right-onset) compared to 100 healthy controls using advanced imaging techniques.
- Findings revealed reduced free water and fractional anisotropy, along with increased mean diffusivity in the CC of patients with left-side PD onset, highlighting the relationship between brain structure and disease symptoms.
Frontal White Matter Changes and Craving Recovery in Inpatients With Heroin Use Disorder.
JAMA Netw Open
December 2024
Departments of Psychiatry and Neuroscience, Icahn School of Medicine at Mount Sinai, New York City, New York.
Importance: Amidst an unprecedented opioid epidemic, identifying neurobiological correlates of change with medication-assisted treatment of heroin use disorder is imperative. White matter impairments in individuals with heroin use disorder (HUD) have been associated with drug craving, a reliable predictor of treatment outcomes; however, little is known about structural connectivity changes with inpatient treatment and abstinence in individuals with HUD.
Objective: To assess white matter microstructure and associations with drug craving changes with inpatient treatment in individuals with HUD (effects of time and rescan compared with controls).
Verbal-Cue Rehabilitation Exercises Are Effective for the Mixed Callosal-Frontal Variant of Alien Hand Syndrome Following Stroke.
Cureus
September 2024
Health Science, Fukui Health Science University, Fukui, JPN.
Alien hand syndrome (AHS) is a rare condition in which a brain-injured patient develops involuntary movements, particularly in the upper limbs, along with difficulty in controlling them and a loss of ownership of the affected hand. AHS is traditionally classified into frontal, callosal, and occipital types. Recently, mixed types have also been reported.
View Article and Find Full Text PDFTop-down modulation of dichotic listening affects interhemispheric connectivity: an electroencephalography study.
Front Neurosci
September 2024
Centre of Psychiatry, Justus Liebig University Giessen, Hessen, Germany.
Introduction: Dichotic listening (DL) has been extensively used as a task to investigate auditory processing and hemispheric lateralisation in humans. According to the "callosal relay model," the typical finding of a right ear advantage (REA) occurs because the information coming from the right ear has direct access to the left dominant hemisphere while the information coming from the left ear has to cross via the corpus callosum. The underlying neuroanatomical correlates and neurophysiological mechanisms have been described using diffusion tensor imaging (DTI) and lagged phase synchronization (LPS) of the interhemispheric auditory pathway.
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