The dynamics of contour integration: A simultaneous EEG–fMRI study

Mijović, Bogdan; Vos, Maarten De; Vanderperren, Katrien; Machilsen, Bart; Sunaert, Stefan; Huffel, Sabine Van; Wagemans, Johan

doi:10.1016/j.neuroimage.2013.11.032

Cited by 38 publications

(42 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that our findings are not necessarily in contrast with recent literature that emphasizes the essential role of higher visual areas in the processing of snake contours (Altmann, Bülthoff, & Kourtzi, 2003;Chen et al, 2014;Kourtzi et al, 2003;Mijović et al, 2013). The rapid-chase definition works from the functional relationship between sequential input and sequential output of the entire macroscopic system.…”

Section: Discussioncontrasting

confidence: 66%

Response priming evidence for feedforward processing of snake contours but not of ladder contours and textures

Schmidt

Vancleef

2016

Vision Research

View full text Add to dashboard Cite

In contour integration, increased difficulty in detection and shape discrimination of a chain of parallel elements (a ladder contour) compared to collinear elements (a snake contour) suggests more extensive processing of ladders than of snakes. In addition, conceptual similarities between ladders and textures - which also involve grouping of parallel elements - raises the question whether ladder and texture processing requires feedback from higher visual areas while snakes are processed in a fast feedforward sweep. We tested this in a response priming paradigm, where participants responded as quickly and accurately as possible to the orientation of a diagonal contour in a Gabor array (target). The diagonal was defined either by a snake, ladder, texture, or a continuous line. The target was preceded with varying stimulus onset asynchrony (SOA) by a prime that was either a snake, ladder, or texture, and was consistent or inconsistent to the response demands of the target. Resulting priming effects clearly distinguished between processing of snakes, ladders, and textures. Effects generally increased with SOA but were stronger for snakes and textures compared to ladders. Importantly, only priming effects for snakes were fully present already in the fastest response times, in accordance with a simple feedforward processing model. We conclude that snakes, ladders, and textures do not share similar processing characteristics, with snakes exhibiting a pronounced processing advantage.

show abstract

Section: Discussioncontrasting

confidence: 66%

Response priming evidence for feedforward processing of snake contours but not of ladder contours and textures

Schmidt

Vancleef

2016

Vision Research

View full text Add to dashboard Cite

show abstract

“…The BA 19 partially overlaps with the LOC, an area that is known to play a relevant role in shape perception and contour integration (Grill-Spector et al, 2001). Interestingly, some studies have shown that global shapes generated by means of grouping by motion (Ferber et al, 2003) or collinearity (Altmann et al, 2003;Mijovic et al, 2014) also elicited activity in the LOC. Resembling our results, Zhang et al (2013) found a modulation of an N180-280 component originated in the left LOC in a Müller-Lyer illusion task.…”

Section: Posterior N210mentioning

confidence: 99%

“…Such a procedure would allow the comparison of brain regions and the time-course of their interplay (Mijović et al, 2012). In this sense, the study by Mijovic et al (2014) identified spatiotemporal interactions between the different cortical regions involved in contour integration and shape detection by applying joint ICA to EEG and hemodynamic responses. These authors found that a loop from LOC to V1-V2 accounted for ERP effects that emerged around 300 ms.…”

Section: Limitations and Future Researchmentioning

confidence: 99%

“…In humans, however, the study of feedforward and feedback processes with only noninvasive methods is more challenging (de-Wit and Schwarzkopf, 2014;Kourtzi and Huberle, 2005). Notably, a recent study including a simultaneous EEG-fMRI recording have provided precise evidence for the existence of a feedback loop from LOC to lowlevel retinotopic areas such as V1 during the processing of contour integration (Mijovic et al, 2014). Other studies have explored the top-down modulation of grouping associated with attention.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A temporo-spatial analysis of the neural correlates of extrinsic perceptual grouping in vision

et al. 2015

View full text Add to dashboard Cite

“…Facilitatory interaction was thought to promote contour integration and completion [23,57]; secondly, while V1 plays a pivotal role in detecting edges and completing contours, contour processing is not merely in V1, and other cortical areas also participate in this visual task. Furthermore, there are important evidences of the presence of feedback loops from higher areas to lower level sensory regions in contour integration [58,59]. Díaz-Pernas et al [60] recently constructed a neural architecture to generate contours of perceptual significance using double feedback among cortical areas.…”

Section: Discussionmentioning

confidence: 99%