J. Edwin Dickinson
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View article: Contribution of higher-order structure to perception of mirror symmetry: Role of shapes and corners
Contribution of higher-order structure to perception of mirror symmetry: Role of shapes and corners Open
Visual mirror symmetry is a global feature that is dependent on specific low-level relationships between component elements. Initially conceptualized as virtual lines between paired elements, it has been suggested that higher-order structu…
View article: Haemodynamic Signatures of Temporal Integration of Visual Mirror Symmetry
Haemodynamic Signatures of Temporal Integration of Visual Mirror Symmetry Open
EEG, fMRI and TMS studies have implicated the extra-striate cortex, including the Lateral Occipital Cortex (LOC), in the processing of visual mirror symmetries. Recent research has found that the sustained posterior negativity (SPN), a sym…
View article: Sensory prediction errors increase coding efficiency in mouse visual cortex through gain amplification
Sensory prediction errors increase coding efficiency in mouse visual cortex through gain amplification Open
The efficiency of sensory coding is affected both by past events (adaptation) and by expectation of future events (prediction). Here we employed a novel visual stimulus paradigm to determine whether expectation influences orientation selec…
View article: Expectation violations enhance neuronal encoding of sensory information in mouse primary visual cortex
Expectation violations enhance neuronal encoding of sensory information in mouse primary visual cortex Open
The response of cortical neurons to sensory stimuli is shaped both by past events (adaptation) and the expectation of future events (prediction). Here we employed a visual stimulus paradigm with different levels of predictability to charac…
View article: Analysis of shape uses local apparent position rather than physical position
Analysis of shape uses local apparent position rather than physical position Open
Objects are often identified by the shapes of their boundaries. Here, by measuring threshold amplitudes for detection of sinusoidal modulation of local position, orientation and centrifugal speed in a closed path of Gabor patches, we show …
View article: Poorer Integration of Local Orientation Information Occurs in Students With High Schizotypal Personality Traits
Poorer Integration of Local Orientation Information Occurs in Students With High Schizotypal Personality Traits Open
Contour integration is impaired in schizophrenia patients, even at the first episode, but little is known about visual integration abilities prior to illness onset. To examine this issue, we compared undergraduate students high and low in …
View article: Convergent evidence for global processing of shape
Convergent evidence for global processing of shape Open
There is an ongoing debate over whether there is convincing evidence in support of global contour integration in shape discrimination tasks, particularly when using radial frequency (RF) patterns as stimuli (Baldwin, Schmidtmann, Kingdom, …
View article: Poorer Search Efficiency in Healthy Young Adults With High Schizotypal Personality Traits
Poorer Search Efficiency in Healthy Young Adults With High Schizotypal Personality Traits Open
Perceptual organization (PO) difficulties have repeatedly been reported in people with schizophrenia, and in healthy individuals with high levels of schizotypy traits, who are at increased risk for schizophrenia. In particular, poor perfor…
View article: Integration of shape information occurs around closed contours but not across them
Integration of shape information occurs around closed contours but not across them Open
Scenery and complex objects can be reduced to a combination of shapes, so it is pertinent to examine if the integration of information found occurring around simple contours also occurs across them. Baldwin, Schmidtmann, Kingdom, and Hess …
View article: The effect of spatiotemporal displacement on the integration of shape information
The effect of spatiotemporal displacement on the integration of shape information Open
Within a natural scene it is not uncommon for an object's shape to be revealed over time. We investigated whether the same integration of shape information that happens around a fully visible contour also happens when that information is d…
View article: Suprathreshold contrast summation over area using drifting gratings
Suprathreshold contrast summation over area using drifting gratings Open
This study investigated contrast summation over area for moving targets applied to a fixed-size contrast pedestal-a technique originally developed by Meese and Summers (2007) to demonstrate strong spatial summation of contrast for static p…
View article: Visual search reveals a critical component to shape
Visual search reveals a critical component to shape Open
Objects are often identified by the shape of their contours. In this study, visual search tasks were used to reveal a visual dimension critical to the analysis of the shape of a boundary-defined area. Points of maximum curvature on closed …
View article: Poorer contour integration occurs in students with positive schizotypy
Poorer contour integration occurs in students with positive schizotypy Open
Schizophrenia patients exhibit poor contour integration on the Jittered Orientation Visual Integration (JOVI) task even at the first episode of illness, but little is known about visual integration abilities prior to illness onset. Here we…
View article: Global processing of random-phase radial frequency patterns but not modulated lines
Global processing of random-phase radial frequency patterns but not modulated lines Open
Previously, researchers have used circular contours with sinusoidal deformations of the radius (radial frequency [RF] patterns) to investigate the underlying processing involved in simple shape perception. On finding that the rapid improve…
View article: Separate banks of information channels encode size and aspect ratio
Separate banks of information channels encode size and aspect ratio Open
Size and aspect ratio are ecologically important visual attributes. Relative size confers depth, and aspect ratio is a size-invariant cue to object identity. The mechanisms of their analyses by the visual system are uncertain. In a series …
View article: Discrete annular regions of texture contribute independently to the analysis of shape from texture
Discrete annular regions of texture contribute independently to the analysis of shape from texture Open
Radial frequency (RF) textures (created by applying a sinusoidal modulation of orientation to an otherwise circular texture) have been shown to be globally processed. RF textures differ from RF patterns (paths deformed from circular by a s…
View article: In unison: First- and second-order information combine for integration of shape information
In unison: First- and second-order information combine for integration of shape information Open
The modulation of orientation around radial frequency (RF) patterns and RF textures is globally processed in both cases. This psychophysical study investigates whether the combination-a textured RF path obtained by applying an RF texture t…
View article: Larger receptive fields revealed using Battenberg stimuli to assess contrast summation with moving patterns
Larger receptive fields revealed using Battenberg stimuli to assess contrast summation with moving patterns Open
This study reevaluated the summation extent for moving stimuli using the Battenberg summation paradigm (Meese, 2010), which aims to circumvent internal noise changes with increasing stimulus size by holding display size constant. In the ch…