Perception of biological motion from limited-lifetime stimuli

Beintema, Jaap A.; Georg, Karsten; Lappe, Markus

doi:10.3758/bf03208763

Cited by 64 publications

(85 citation statements)

References 37 publications

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“…The frame duration was 8.3 ms. This combination of parameters gives a stable impression of a walking figure (Beintema et al, 2006), and all subjects were able to recognize it easily. In Experiment 3, a point-light walker with 12 points on the major joints was used.…”

Section: Stimulimentioning

confidence: 99%

“…Thus, the strength of the aftereffect was greater in the facingadaptation task than in the walking-adaptation task. the stimuli consisted of point-light walkers with limited point lifetime, which limits veridical local image motion signals (Beintema et al, 2006;Beintema & Lappe, 2002). Spurious and nonveridical local motion signals introduced by this technique (Beintema et al, 2006;Casile & Giese, 2005) vary randomly from frame to frame and should not lead to any local motion adaptation.…”

Section: Experiments 1: Facing and Walking Aftereffectsmentioning

confidence: 99%

“…the stimuli consisted of point-light walkers with limited point lifetime, which limits veridical local image motion signals (Beintema et al, 2006;Beintema & Lappe, 2002). Spurious and nonveridical local motion signals introduced by this technique (Beintema et al, 2006;Casile & Giese, 2005) vary randomly from frame to frame and should not lead to any local motion adaptation. However, a second way to avoid adaptation to local motion influencing the results is to present the adaptation and the test stimuli at different retinal locations, since local motion adaptation at one position in the visual field is known to transfer only weakly to other positions (Mather et al, 2008;Moulden, 1980).…”

Section: Experiments 1: Facing and Walking Aftereffectsmentioning

confidence: 99%

“…One walking cycle took 1.3 s. The point-light stimuli consisted of white points on a black background. In most experiments, the light points were randomly distributed on the limb segments of the walker, following Beintema and Lappe (2002) and Beintema, Georg, and Lappe (2006). The points were redistributed anew for every new animation frame, thereby interfering with the apparent motion signal of the dots.…”

Section: Stimulimentioning

confidence: 99%

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Adaptation to biological motion leads to a motion and a form aftereffect

Theusner¹,

Lussanet²,

Lappe³

2011

Atten Percept Psychophys

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Recent models have proposed a two-stage process of biological motion recognition. First, template or snapshot neurons estimate the body form. Then, motion is estimated from body form change. This predicts separate aftereffects for body form and body motion. We tested this prediction. Observers viewing leftward-or rightward-facing point-light walkers that walked forward or backward subsequently experienced oppositely directed aftereffects in stimuli ambiguous in the facing or the walking direction. These aftereffects did not originate from adaptation to the motion of the individual light points, because they occurred for limitedlifetime stimuli that restrict local motion. They also occurred when the adaptor displayed a random sequence of body postures that did not induce the walking motion percept. We thus conclude that biological motion gives rise to separate form and motion aftereffects and that body form representations are involved in biological motion perception.

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Section: Stimulimentioning

confidence: 99%

Section: Experiments 1: Facing and Walking Aftereffectsmentioning

confidence: 99%

Section: Experiments 1: Facing and Walking Aftereffectsmentioning

confidence: 99%

Section: Stimulimentioning

confidence: 99%

See 2 more Smart Citations

Adaptation to biological motion leads to a motion and a form aftereffect

Theusner¹,

Lussanet²,

Lappe³

2011

Atten Percept Psychophys

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show abstract

“…For the four biological-motion stimuli in the present study, velocity encoding is to some extent identical, whereas identity encoding differentiated by the global configuration is different. A number of previous studies have revealed that except for the upright intact biological motion, the other three biological-motion patterns contained no global configuration information but kept motion signals (Beintema, Georg, & Lappe, 2006;Bertenthal & Pinto, 1994;Hirai, Chang, Saunders, & Troje, 2011;Lange & Lappe, 2006;Wang, Zhang, He, & Jiang, 2010). Therefore, the possible explanation for the disappearance of the inversion effect during memory-guided tracking scrambled biological motion is that the spatial location information is not sufficient to build and maintain the representation continuity about a scrambled point-light walker or its inverted version, and object identity may act as an important information source in visual tracking.…”

Section: Discussionmentioning

confidence: 99%

Disappearance of the inversion effect during memory-guided tracking of scrambled biological motion

et al. 2016

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The human visual system is highly sensitive to biological motion. Even when a point-light walker is temporarily occluded from view by other objects, our eyes are still able to maintain tracking continuity. To investigate how the visual system establishes a correspondence between the biological-motion stimuli visible before and after the disruption, we used the occlusion paradigm with biological-motion stimuli that were intact or scrambled. The results showed that during visually guided tracking, both the observers' predicted times and predictive smooth pursuit were more accurate for upright biological motion (intact and scrambled) than for inverted biological motion. During memory-guided tracking, however, the processing advantage for upright as compared with inverted biological motion was not found in the scrambled condition, but in the intact condition only. This suggests that spatial location information alone is not sufficient to build and maintain the representational continuity of the biological motion across the occlusion, and that the object identity may act as an important information source in visual tracking. The inversion effect disappeared when the scrambled biological motion was occluded, which indicates that when biological motion is temporarily occluded and there is a complete absence of visual feedback signals, an oculomotor prediction is executed to maintain the tracking continuity, which is established not only by updating the target's spatial location, but also by the retrieval of identity information stored in long-term memory.

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Second-Order Motion Stimuli: A New Handle to Visual Motion Processing

Ilg

Churan²

2009

Dynamics of Visual Motion Processing

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Perception of biological motion from limited-lifetime stimuli

Cited by 64 publications

References 37 publications

Adaptation to biological motion leads to a motion and a form aftereffect

Adaptation to biological motion leads to a motion and a form aftereffect

Disappearance of the inversion effect during memory-guided tracking of scrambled biological motion

Second-Order Motion Stimuli: A New Handle to Visual Motion Processing

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