The functional subdivision of the visual brain: Is there a real illusion effect on action? A multi-lab replication study

Kopiske, Karl; Bruno, Nicola; Hesse, Constanze; Schenk, Thomas; Franz, Volker H.

doi:10.1016/j.cortex.2016.03.020

Cited by 95 publications

(96 citation statements)

References 67 publications

(208 reference statements)

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“…However, the small correlation reported in our study was mainly explained by the big context condition. Although we found a small correlation with a relatively small sample size, the correlation that we found between perception and action is in accordance with similar (low) correlations in grasping 51 . Taken together, our results partially confirm that the MT is scaled according to the perceived target size; the scaling was present (only) when the target looked smaller.…”

Section: Discussionsupporting

confidence: 89%

“…Note that our believe that obstruction avoidance has played a negligible role, if any, in our present study is supported by a large, multi-lab study of Kopiske et al . 51 that examined the obstruction avoidance hypothesis in 144 participants. They found no evidence that the effects of visual illusions on grasping could be explained by obstruction avoidance.…”

Section: Discussionmentioning

confidence: 99%

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Ebbinghaus figures that deceive the eye do not necessarily deceive the hand

Knol¹,

Huys²,

Sarrazin³

et al. 2017

Sci Rep

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In support of the visual stream dissociation hypothesis, which states that distinct visual streams serve vision-for-perception and vision-for-action, visual size illusions were reported over 20 years ago to ‘deceive the eye but not the hand’. Ever since, inconclusive results and contradictory interpretations have accumulated. Therefore, we investigated the effects of the Ebbinghaus figure on repetitive aiming movements with distinct dynamics. Participants performed a Fitts’ task in which Ebbinghaus figures served as targets. We systematically varied the three parameters which have been shown to influence the perceived size of the Ebbinghaus figure’s target circle, namely the size of the target, its distance to the context circles and the size of the context circles. This paper shows that movement is significantly affected by the context size, but, in contrast to perception, not by the other two parameters. This is especially prominent in the approach phase of the movement towards the target, regardless of the dynamics. To reconcile the findings, we argue that different informational variables are used for size perception and the visual control of movements irrespective of whether certain variables induce (perceptual) illusions.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Ebbinghaus figures that deceive the eye do not necessarily deceive the hand

Knol¹,

Huys²,

Sarrazin³

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…On the one hand, numerous studies report size-contrast effects on perception but not action (e.g., Aglioti et al, 1995; Haffenden and Goodale, 1998; Marotta et al, 1998; Haffenden et al, 2001). On the other hand, there are numerous other studies that do not provide evidence for such dissociation with similar size-contrast effects across perception and action tasks (e.g., Pavani et al, 1999; Van Donkelaar, 1999; Franz et al, 2000; Glover and Dixon, 2001; Kopiske et al, 2016). Along these lines, Corbett and Song (2014) demonstrated that visually guided actions directed to test circles presented in regions adapted to large/small mean sized displays were initially biased in-line with a persistent perceptual aftereffect.…”

Section: Discussionmentioning

confidence: 95%

Perceptual Averaging in Individuals with Autism Spectrum Disorder

2016

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There is mounting evidence that observers rely on statistical summaries of visual information to maintain stable and coherent perception. Sensitivity to the mean (or other prototypical value) of a visual feature (e.g., mean size) appears to be a pervasive process in human visual perception. Previous studies in individuals diagnosed with Autism Spectrum Disorder (ASD) have uncovered characteristic patterns of visual processing that suggest they may rely more on enhanced local representations of individual objects instead of computing such perceptual averages. To further explore the fundamental nature of abstract statistical representation in visual perception, we investigated perceptual averaging of mean size in a group of 12 high-functioning individuals diagnosed with ASD using simplified versions of two identification and adaptation tasks that elicited characteristic perceptual averaging effects in a control group of neurotypical participants. In Experiment 1, participants performed with above chance accuracy in recalling the mean size of a set of circles (mean task) despite poor accuracy in recalling individual circle sizes (member task). In Experiment 2, their judgments of single circle size were biased by mean size adaptation. Overall, these results suggest that individuals with ASD perceptually average information about sets of objects in the surrounding environment. Our results underscore the fundamental nature of perceptual averaging in vision, and further our understanding of how autistic individuals make sense of the external environment.

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“…Moreover, behavioral studies of healthy subjects using geometrical illusions also support the proposal for functionally distinct visual systems for perceptual judgments and action (van Doorn et al, 2007; Bruno et al, 2008; Ganel et al, 2008; Stöttinger et al, 2010, but see for a recent debate Kopiske et al, 2016 and Whitwell and Goodale, 2016). The observation that illusions, most notably the Müller-Lyer illusion, can deceive perceptual judgments while visually controlled movements (often pointing) toward the same object are less affected, is interpreted as evidence for a distinction between the two visual systems.…”

Section: Introductionmentioning

confidence: 66%

Verbalizations Affect Visuomotor Control in Hitting Objects to Distant Targets

2017

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There is a long-standing proposal for the existence of two neuroanatomically and functionally separate visual systems; one supported by the dorsal pathway to control action and the second supported by the ventral pathway to handle explicit perceptual judgments. The dorsal pathway requires fast access to egocentric information, while the ventral pathway primarily requires allocentric information. Despite the evidence for functionally distinct systems, researchers have posited important interactions. This paper examines evidence to what degree the interaction becomes more important when target-identity, the perception of which is supported by the ventral stream, is verbalized during the execution of a target-directed far-aiming movement. In the experiment reported here participants hit balls toward distant targets while concurrently making explicit perceptual judgments of target properties. The endpoint of a shaft served as the target, with conditions including illusory arrow fins at the endpoint. Participants verbalized the location of the target by comparing it to a reference line and calling out “closer” or “further” while propelling the ball to the target. The impact velocity at ball contact was compared for hits toward three shafts of lengths, 94, 100, and 106 cm, with and without verbalizations and delays. It was observed that the meaning of the expressed words modulated movement execution when the verbalizations were consistent with the action characteristics. This effect of semantic content was evident regardless of target visibility during movement execution, demonstrating it was not restricted to movements that rely on visual memory. In addition to a direct effect of semantic content we anticipated an indirect effect of verbalization to result in action shifting toward the use of context-dependent allocentric information. This would result in an illusion bias on the impact velocity when the target is embedded in a Müller-Lyer configuration. We observed an ubiquitous effect of illusory context on movement execution, and not only when verbalizations were made. We suggest that the current experimental design with a far-aiming task where most conditions required reporting or retaining spatial characteristics of targets for action over time may have elicited a strong reliance on allocentric information to guide action.

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The functional subdivision of the visual brain: Is there a real illusion effect on action? A multi-lab replication study

Cited by 95 publications

References 67 publications

Ebbinghaus figures that deceive the eye do not necessarily deceive the hand

Ebbinghaus figures that deceive the eye do not necessarily deceive the hand

Perceptual Averaging in Individuals with Autism Spectrum Disorder

Verbalizations Affect Visuomotor Control in Hitting Objects to Distant Targets

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