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Fixational eye movements and edge integration in lightness perception.
Vision Res
January 2025
Department of Psychology, University of Nevada, Reno, NV 89557, United States.
A neural theory of human lightness computation is described and computer-simulated. The theory proposes that lightness is derived from transient ON and OFF cell responses in the early visual pathways that have different characteristic neural gains and that are generated by fixational eye movements (FEMs) as the eyes transit luminance edges in the image. The ON and OFF responses are combined with corollary discharge signals that encode the eye movement direction to create directionally selective ON and OFF responses.
View Article and Find Full Text PDFPerceptual constancy for an odor is acquired through changes in primary sensory neurons.
Sci Adv
December 2024
School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, UK.
The ability to consistently recognize an object despite variable sensory input is termed perceptual constancy. This ability is not innate; rather, it develops with experience early in life. We show that, when mice are naïve to an odor object, perceptual constancy is absent across increasing concentrations.
View Article and Find Full Text PDFPerceptual constancy of pareidolias across paper and digital testing formats in neurodegenerative diseases.
Heliyon
November 2024
Center for Global Health, Department of Medical Innovation, Osaka University Hospital, Osaka, Japan.
Article Synopsis
- Pareidolias are perceptual deficits where people see meaningful shapes in ambiguous visuals, studied in neurodegenerative diseases using a noise pareidolia test.
- This research explored differences between paper-based and digital testing methods for pareidolias among healthy individuals and patients with Alzheimer's, DLB, and Parkinson's disease.
- Results show that pareidolic perceptions remain consistent in both testing formats, and digital testing on smartphones can effectively maintain the functionality of assessing these visual illusions.
Fingertip friction is a key component of tactile perception. In active tactile exploration, friction forces depend on the applied normal force and on the sliding speed chosen. We have investigated whether humans perceive the speed dependence of friction for textured surfaces of materials, which show either increase or decrease of the friction coefficient with speed.
View Article and Find Full Text PDFPolygons have a small facilitatory effect on extraretinal symmetry perception.
Neuroimage
November 2024
University of Liverpool, Department of Psychological Sciences, Eleanor Rathbone Building, University of Liverpool, Liverpool L69 7ZA, United Kingdom.
Symmetrical objects only project a symmetrical image onto the retina when viewed from certain angles. Previous work has investigated the ERP response to visual symmetry in frontoparallel and perspective views. When participants are attending to regularity, the ERPs are the same.
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