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Quantifying sighting dominance using on-display projections of monocular and binocular views.
Behav Res Methods
January 2025
CIMeC, Center for Mind/Brain Sciences, The University of Trento, Trento, Italy.
Sighting dominance is an important behavioral property which has been difficult to measure quantitatively with high precision. We developed a measurement method that is grounded in a two-camera model that satisfies these aims. Using a simple alignment task, this method quantifies sighting ocular dominance during binocular viewing, identifying each eye's relative contribution to binocular vision.
View Article and Find Full Text PDFModulation of initial leftward bias in visual search by parietal tDCS.
PLoS One
December 2024
Psychological Science Research Institute, UCLouvain, Louvain-la-Neuve, Belgium.
Transcranial direct current stimulation (tDCS) has the potential to modulate spatial attention by enhancing the activity in one hemisphere relative to the other. This study aims to inform neurorehabilitation strategies for spatial attention disorders by investigating the impact of tDCS on the performance of healthy participants. Unlike prior research that focused on visual detection, we extended the investigation to visual search and visual imagery using computerized neuropsychological tests.
View Article and Find Full Text PDFD1 Receptor Functional Asymmetry at Striatonigral Neurons: A Neurochemical and Behavioral Study in Male Wistar Rats.
J Neurosci Res
January 2025
Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de Mexico, Mexico.
Lateralization of motor behavior, a common phenomenon in humans and several species, is modulated by the basal ganglia, a site pointed out for the interhemispheric differences related to lateralization. Our study aims to shed light on the potential role of the striatonigral D1 receptor in functional asymmetry in normal conditions through neurochemical and behavioral means. We found that D1 receptor activation and D1/D3 receptor coactivation in striatonigral neurons leads to more cAMP production by adenylyl cyclase in the striatum and GABA release in their terminals in the right hemisphere compared to the left.
View Article and Find Full Text PDFLong-term forced-use therapy after sensorimotor cortex lesions restores contralesional hand function and promotes its preference in Macaca mulatta.
Exp Brain Res
December 2024
Division of Basic Biomedical Sciences, Laboratory of Neurological Sciences, The University of South Dakota, Sanford School of Medicine, Vermillion, SD, USA.
Injury to one cerebral hemisphere can result in paresis of the contralesional hand and subsequent preference of the ipsilesional hand in daily activities. However, forced use therapy in humans can improve function of the contralesional paretic hand and increase its use in daily activities, although the ipsilesional hand may remain preferred for fine motor activities. Studies in monkeys have shown that minimal forced use of the contralesional hand, which was the preferred hand prior to brain injury, can produce remarkable recovery of function.
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
December 2024
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.
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