Electrophysiological priming effects confirm that the extrastriate symmetry network is not gated by luminance polarity

Makin, Alexis D. J.; Piovesan, Andrea; Tyson‐Carr, John; Rampone, Giulia; Derpsch, Yiovanna; Bertamini, Marco

doi:10.1111/ejn.14966

Cited by 6 publications

(11 citation statements)

References 50 publications

(81 reference statements)

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“…In other recently published work, we found SPN priming transferred between black and white reflections. This shows the regularity code is independent of luminance polarity [36] as anticipated by previous work using other methods [37][38][39]. It seems that different regularities are coded by overlapping neural populations, but only when they are presented at the same retinal location.…”

Section: Plos Onesupporting

confidence: 82%

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Electrophysiological priming effects demonstrate independence and overlap of visual regularity representations in the extrastriate cortex

et al. 2021

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An Event Related Potential (ERP) component called the Sustained Posterior Negativity (SPN) is generated by regular visual patterns (e.g. vertical reflectional symmetry, horizontal reflectional symmetry or rotational symmetry). Behavioural studies suggest symmetry becomes increasingly salient when the exemplars update rapidly. In line with this, Experiment 1 (N = 48) found that SPN amplitude increased when three different reflectional symmetry patterns were presented sequentially. We call this effect ‘SPN priming’. We then exploited SPN priming to investigate independence of different symmetry representations. SPN priming did not survive changes in retinal location (Experiment 2, N = 48) or non-orthogonal changes in axis orientation (Experiment 3, N = 48). However, SPN priming transferred between vertical and horizontal axis orientations (Experiment 4, N = 48) and between reflectional and rotational symmetry (Experiment 5, N = 48). SPN priming is interesting in itself, and a useful new method for identifying functional boundaries of the symmetry response. We conclude that visual regularities at different retinal locations are coded independently. However, there is some overlap between different regularities presented at the same retinal location.

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Section: Plos Onesupporting

confidence: 82%

“…As mentioned, Makin et al [ 36 ] used SPN priming technique to demonstrate that the regularity code is luminance independent. Future work could use the SPN priming effect to answer other questions about symmetry coding.…”

Section: Discussionmentioning

confidence: 99%

Electrophysiological priming effects demonstrate independence and overlap of visual regularity representations in the extrastriate cortex

et al. 2021

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“…The repetition of identical information along the central axis may have caused an enhancement (priming) effect on the ERP response in t2. Recent research has shown that repeated presentations of symmetrical patterns increase SPN amplitude 43,86,87 ; this effect has been termed SPN priming 86 . This response enhancement, however, is greater when the second exemplar is different from the rst one 43 .…”

Section: Discussion Of Experimentsmentioning

confidence: 99%

Electrophysiological Evidence of the Amodal Representation of Symmetry in Extrastriate Areas

Rampone

Adam

Makin

et al. 2021

Preprint

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Extrastriate visual areas are strongly activated by image symmetry. Less is known about symmetry representation at object-, rather than image-, level. Here we investigated electrophysiological responses to symmetry, generated by amodal completion of partially-occluded polygon shapes. We used a similar paradigm in four experiments (N=112). A fully-visible abstract shape (either symmetric or asymmetric) was presented for 250ms (t0). A large rectangle covered it entirely for 250ms (t1) and then moved to one side to reveal half of the shape hidden behind (t2, 1000ms). Note that at t2 no symmetry could be inferred from retinal image information. In half of the trials the shape was the same as previously presented, in the other trials it was replaced by a novel shape. Participants matched shapes similarity (Exp. 1 and Exp. 2), or their colour (Exp. 3) or the orientation of a triangle superimposed to the shapes (Exp. 4). The fully-visible shapes (t0-t1) elicited automatic symmetry-specific ERP responses in all experiments. Importantly, there was an exposure-dependent symmetry-response to the occluded shapes that were recognised as previously seen (t2). Exp. 2 and Exp.4 confirmed this second ERP (t2) did not reflect a reinforcement of a residual carry-over response from t0. We conclude that the extrastriate symmetry-network can achieve amodal representation of symmetry from occluded objects that have been previously experienced as wholes.

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“…The repetition of identical information along the central axis may have caused an enhancement ( priming ) effect on the ERP response in t2. Recent research has shown that when three symmetrical images are presented in succession, SPN amplitude increases 43 , 86 , 87 . This effect has been termed SPN priming 87 , and suggests that amplitude of the extra-striate symmetry response is partially determined by the immediately preceding stimulus.…”

Section: Methodsmentioning

confidence: 99%

“…To avoid confusion, we should mention a phenomenon called SPN priming (i.e. increase in SPN amplitude with presentation of symmetrical images in succession 86 – 88 ). This form of past-history effect reflects interdependency of responses to fully-visible image symmetries.…”

Section: Introductionmentioning

confidence: 99%

Electrophysiological evidence of the amodal representation of symmetry in extrastriate areas

Rampone

Adam

Makin

et al. 2022

Sci Rep

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Extrastriate visual areas are strongly activated by image symmetry. Less is known about symmetry representation at object-level rather than image-level. Here we investigated electrophysiological responses to symmetry, generated by amodal completion of partially-occluded polygon shapes. We used a similar paradigm in four experiments (N = 112). A fully-visible abstract shape (either symmetric or asymmetric) was presented for 250 ms (t0). A large rectangle covered it entirely for 250 ms (t1) and then moved to one side to reveal one half of the shape hidden behind (t2, 1000 ms). Note that at t2 no symmetry could be extracted from retinal image information. In half of the trials the shape was the same as previously presented, in the other trials it was replaced by a novel shape. Participants matched shapes similarity (Exp. 1 and Exp. 2), or their colour (Exp. 3) or the orientation of a triangle superimposed to the shapes (Exp. 4). The fully-visible shapes (t0–t1) elicited automatic symmetry-specific ERP responses in all experiments. Importantly, there was an exposure-dependent symmetry-response to the occluded shapes that were recognised as previously seen (t2). Exp. 2 and Exp.4 confirmed this second ERP (t2) did not reflect a reinforcement of a residual carry-over response from t0. We conclude that the extrastriate symmetry-network can achieve amodal representation of symmetry from occluded objects that have been previously experienced as wholes.

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Electrophysiological priming effects confirm that the extrastriate symmetry network is not gated by luminance polarity

Cited by 6 publications

References 50 publications

Electrophysiological priming effects demonstrate independence and overlap of visual regularity representations in the extrastriate cortex

Electrophysiological priming effects demonstrate independence and overlap of visual regularity representations in the extrastriate cortex

Electrophysiological Evidence of the Amodal Representation of Symmetry in Extrastriate Areas

Electrophysiological evidence of the amodal representation of symmetry in extrastriate areas

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