Right‐lateralized alpha desynchronization during regularity discrimination: Hemispheric specialization or directed spatial attention?

Wright, Damien; Makin, Alexis D. J.; Bertamini, Marco

doi:10.1111/psyp.12399

Cited by 29 publications

(54 citation statements)

References 56 publications

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“…Sasaki et al 2005). A right hemisphere advantage for symmetry processing has also be found with TMS and occipital alpha desynchronization analysis (Verma et al 2013; Bona et al 2014; Wright et al 2015). …”

Section: Study 1: Discussionmentioning

confidence: 73%

An Electrophysiological Index of Perceptual Goodness

et al. 2016

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A traditional line of work starting with the Gestalt school has shown that patterns vary in strength and salience; a difference in “Perceptual goodness.” The Holographic weight of evidence model quantifies goodness of visual regularities. The key formula states that W = E/N, where E is number of holographic identities in a pattern and N is number of elements. We tested whether W predicts the amplitude of the neural response to regularity in an extrastriate symmetry-sensitive network. We recorded an Event Related Potential (ERP) generated by symmetry called the Sustained Posterior Negativity (SPN). First, we reanalyzed the published work and found that W explained most variance in SPN amplitude. Then in four new studies, we confirmed specific predictions of the holographic model regarding 1) the differential effects of numerosity on reflection and repetition, 2) the similarity between reflection and Glass patterns, 3) multiple symmetries, and 4) symmetry and anti-symmetry. In all cases, the holographic approach predicted SPN amplitude remarkably well; particularly in an early window around 300–400 ms post stimulus onset. Although the holographic model was not conceived as a model of neural processing, it captures many details of the brain response to symmetry.

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Section: Study 1: Discussionmentioning

confidence: 73%

An Electrophysiological Index of Perceptual Goodness

et al. 2016

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“…Wright et al [57] have recently tested this idea. Participants were presented with vertical or horizontally oriented patterns ( Figure 5A), and made a reflection vs. translation judgement.…”

Section: Question Five: How Are Brain Rhythms In the Two Hemispheres mentioning

confidence: 99%

“…Wright et al [57] compared the SPN with horizontal and vertical orientations. For horizontal patterns the paired elements are presented within the same hemifield, but the SPN was similar irrespective of orientation.…”

Section: Question One: Is There An Automatic and Sustained Response Tmentioning

confidence: 99%

“…Most papers about the SPN have not reported any lateralization, but they may have lacked power. We decided to test this possibility by combined data from previous recordings of the SPN (220 participants in total: 24 participants from [57], 60 participants from [45], 48 participants from [50], and 40 participants from [53], and 48 participants from [58]). All these experiments showed a clear SPN component (averaging across sub conditions when necessary).…”

Section: Question Five: How Are Brain Rhythms In the Two Hemispheres mentioning

confidence: 99%

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Brain Activity in Response to Visual Symmetry

2014

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Abstract:A number of studies have explored visual symmetry processing by measuring event related potentials and neural oscillatory activity. There is a sustained posterior negativity (SPN) related to the presence of symmetry. There is also functional magnetic resonance imaging (MRI) activity in extrastriate visual areas and in the lateral occipital complex. We summarise the evidence by answering six questions. (1) Is there an automatic and sustained response to symmetry in visual areas? Answer: Yes, and this suggests automatic processing of symmetry. (2) Which brain areas are involved in symmetry perception? Answer: There is an extended network from extrastriate areas to higher areas. (3) Is reflection special? Answer: Reflection is the optimal stimulus for a more general regularity-sensitive network. (4) Is the response to symmetry independent of view angle? Answer: When people classify patterns as symmetrical or random, the response to symmetry is view-invariant. When people attend to other dimensions, the network responds to residual regularity in the image. (5) How are brain rhythms in the two hemispheres altered during symmetry perception? Answer: Symmetry processing (rather than presence) produces more alpha desynchronization in the right posterior regions. Finally, (6) does symmetry processing produce positive affect? Answer: Not in the strongest sense, but behavioural measures reveal implicit positive evaluation of abstract symmetry.

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“…In a following fMRI study, Wilkinson and Halligan [29] found that the cerebral substrate of the LVF advantage for detecting the presence/absence of symmetry in lines is the right anterior cingulate gyrus. Bertamini and Makin [30] found that symmetry processing induced occipital alpha Event Related Desynchronization (ERD) in the right hemisphere, confirming at the electrophysiological level the stronger right-than left-hemispheric involvement in symmetry detection (see also [31,32]). In another electroencephalographic (EEG) study, Makin and colleagues [33] also showed that the Sustained Posterior Negativity is stronger for reflection than for rotation and translation, and that this is true when participants were explicitly required to detect the presence of regularity in the stimuli.…”

Section: Introductionmentioning

confidence: 81%

Asymmetry for Symmetry: Right-Hemispheric Superiority in Bi-Dimensional Symmetry Perception

Prete

Fabri

Foschi³

et al. 2017

Symmetry

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Abstract:A right-hemispheric superiority has been shown for spatial symmetry perception with mono-dimensional stimuli (e.g., bisected lines). Nevertheless, the cerebral imbalance for bi-dimensional stimuli is still controversial, and the aim of the present study is to investigate this issue. Healthy participants and a split-brain patient (D.D.C.) were tested in a divided visual field paradigm, in which a square shape was presented either in the left or right visual field and they were asked to judge whether a dot was placed exactly in the center of the square or off-center, by using the left/right hand in two separate sessions. The performance of healthy participants was better when the stimuli presented in the left visual field (LVF) were on-center rather than off-center. The performance of D.D.C. was higher than chance only when on-center stimuli were presented in the LVF in the left hand session. Only in this condition did his accuracy not differ with respect to that of the control group, whereas in all of the other conditions, it was lower than the controls' accuracy. We conclude that the right-hemispheric advantage already shown for mono-dimensional stimuli can be extended also to bi-dimensional configurations, confirming the right-hemispheric superiority for spatial symmetry perception.

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Right‐lateralized alpha desynchronization during regularity discrimination: Hemispheric specialization or directed spatial attention?

Cited by 29 publications

References 56 publications

An Electrophysiological Index of Perceptual Goodness

An Electrophysiological Index of Perceptual Goodness

Brain Activity in Response to Visual Symmetry

Asymmetry for Symmetry: Right-Hemispheric Superiority in Bi-Dimensional Symmetry Perception

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