John A. Greenwood

This study simulates visual deficits in healthy adults to determine if incomplete letter recognition issues in dementia patients are due to cortical or optical factors, finding cortical factors are more significant.

This study investigates foveal crowding in albinism, finding elevated crowding with nystagmus-related spatial anisotropy and lack of featural selectivity, suggesting both retinal motion and sensory deficits.

This study examines the development of visual acuity and crowding in children, finding that foveal crowding develops more slowly than acuity and shows similar selectivity to peripheral crowding.

This study finds that older adults report fewer complex visual hallucinations than younger adults in an experimental setting, suggesting reduced hallucination proneness with age.

This paper shows that temporal confounds in fMRI studies of perceptual learning can create false signals of neural reorganisation, and suggests ways to mitigate these issues.

The paper shows that face-selective brain regions share spatial sampling patterns with early visual cortex, supporting a hierarchical model of visuospatial organization in face recognition.

This study shows that face perception acuity varies systematically across the visual field, mirroring patterns seen in low-level visual processing.

The paper investigates how variations in visual crowding affect object appearance and shows that these effects are best explained by a population-coding model involving receptive field overlap.

This study compares flicker and Ganzfeld techniques to determine if they share a common mechanism for inducing visual hallucinations, finding similar patterns in frequency and complexity.

The paper shows that visual crowding effects in peripheral vision, foveal vision of children with typical vision, and amblyopia are systematic and share a common mechanism.

This study investigates whether elevated foveal crowding in nystagmus is caused by eye movements or sensory deficits, finding that crowding is stronger with horizontal flankers, consistent with eye movement interference.

The paper examines the heritability of retinotopic maps in human visual cortex using twin pairs and finds partial genetic influence on polar angle preferences and spatial selectivity in V2 and V3.

This study investigates whether visual crowding affects colour and motion perception independently, finding a double dissociation that suggests feature-specific disruption rather than a single process.

This study examines how population receptive fields (pRFs) respond to motion-defined stimuli using fMRI, finding that retinotopic maps in higher visual areas are more pronounced for global motion compared to local motion, and that this pattern is not specific to motion-defined stimuli.