The interaction of global motion and global form processing on the perception of implied motion: An equivalent noise approach

Joshi, Mahesh Raj; Simmers, Anita J.; Jeon, Seong Taek

doi:10.1016/j.visres.2021.04.006

Cited by 5 publications

(1 citation statement)

References 56 publications

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“…This perceptual process plays an important role in navigation, judgment of motion speed, and avoidance of moving obstacles ( Hoffman et al, 2015 ). One method extensively used to assess GMP is the random dot kinematogram (RDK), which consists of dots moving in various directions: signal dots move in a specific direction, while noise dots move in random directions ( Pilz et al, 2017 ; Ward et al, 2018 ; Benassi et al, 2021 ; Joshi et al, 2021 ). The task is to identify the global direction of the moving dots.…”

Section: Introductionmentioning

confidence: 99%

Alterations in white matter integrity and network topological properties are associated with a decrease in global motion perception in older adults

Yan

Zhang²,

Yin³

et al. 2023

Front. Aging Neurosci.

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Previous studies have mainly explored the effects of structural and functional aging of cortical regions on global motion sensitivity in older adults, but none have explored the structural white matter (WM) substrates underlying the age-related decrease in global motion perception (GMP). In this study, random dot kinematogram and diffusion tensor imaging were used to investigate the effects of age-related reductions in WM fiber integrity and connectivity across various regions on GMP. We recruited 106 younger adults and 94 older adults and utilized both tract-based spatial statistics analysis and graph theoretical analysis to comprehensively investigate group differences in WM microstructural and network connections between older and younger adults at the microscopic and macroscopic levels. Moreover, partial correlation analysis was used to explore the relationship between alterations in WM and the age-related decrease in GMP. The results showed that decreased GMP in older adults was related to decreased fractional anisotropy (FA) of the inferior frontal-occipital fasciculus, inferior longitudinal fasciculus, anterior thalamic radiation, superior longitudinal fasciculus, and cingulum cingulate gyrus. Decreased global efficiency of the WM structural network and increased characteristic path length were closely associated with decreased global motion sensitivity. These results suggest that the reduced GMP in older adults may stem from reduced WM integrity in specific regions of WM fiber tracts as well as decreased efficiency of information integration and communication between distant cortical regions, supporting the “disconnection hypothesis” of cognitive aging.

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