Contribution of extraretinal signals to the scaling of object distance during self-motion

Panerai, Francesco; Cornilleau-Pérès, V.; Droulez, Jacques

doi:10.3758/bf03194739

Cited by 24 publications

(33 citation statements)

References 55 publications

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“…Optic flow is ambiguous with respect to absolute or egocentric height (e.g., Bingham & Stassen, 1994;Longuet-Higgins, 1986;Stappers, 1992). Many researchers have assumed that optic flow is disambiguated through inferential processing (e.g., Panerai et al, 2002). However, unambiguous information about egocentric height may exist in the global array, that is, in higher order relations between patterns available to the visual, vestibular, and kinesthetic systems.…”

Section: Does Accurate Perception Require Exploratory Movement?mentioning

confidence: 98%

Movement in the Perception of an Affordance for Wheelchair Locomotion

Stoffregen

Yang

Giveans

et al. 2009

Ecological Psychology

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We investigated the role of movement in the perception of a novel affordance for wheelchair locomotion. Healthy adults without prior wheelchair experience judged the lowest lintel under which they could roll in the wheelchair. Prior to judgments, some participants were given brief ( 2 min) practice at self-controlled wheelchair locomotion. There were 2 main results. First, participants who had this brief practice accurately judged their own minimum passage height (even when practice did not include passage under low lintels), whereas participants who had no practice gave inaccurate judgments. Second, prejudgment practice strongly influenced movement of the head and torso during judgment sessions. The results demonstrate that affordance perception can be learned through brief, indirect practice and suggest that such practice can inform exploratory movement.

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Section: Does Accurate Perception Require Exploratory Movement?mentioning

confidence: 98%

Movement in the Perception of an Affordance for Wheelchair Locomotion

Stoffregen

Yang

Giveans

et al. 2009

Ecological Psychology

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“…Motion parallax, generally recognized as an independent cue for perception of relative distances [36], provides robust estimates of absolute egocentric distances when combined with extra-retinal information about the observer's self-motion (see Box 2). In a recent series of experiments [37], it has been shown that the central nervous system is able to combine these two types of information to account for repetitive head movements, even when they are small (approx. 5 cm).…”

Section: Visual Cuesmentioning

confidence: 99%

Evaluating perception in driving simulation experiments

Kemeny

Panerai

2003

Trends in Cognitive Sciences

280

147

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The use of driving simulation for vehicle design and driver perception studies is expanding rapidly. This is largely because simulation saves engineering time and costs, and can be used for studies of road and traffic safety. How applicable driving simulation is to the real world is unclear however, because analyses of perceptual criteria carried out in driving simulation experiments are controversial. On the one hand, recent data suggest that, in driving simulators with a large field of view, longitudinal speed can be estimated correctly from visual information. On the other hand, recent psychophysical studies have revealed an unexpectedly important contribution of vestibular cues in distance perception and steering, prompting a re-evaluation of the role of visuo-vestibular interaction in driving simulation studies.Vehicle driving implies perception and control of selfmotion at a greater range of velocities than locomotion by walking. It is often considered to be a task dominated by visual information. However, it is well-established that other sensory information, such as that provided by the vestibular and PROPRIOCEPTIVE (see Glossary) channels, also contributes to the perception and control of selfmotion. Motivated by a recent renewed interest in the role and function of these non-visual sensory modalities, we aim in this review to re-evaluate the role of visuovestibular interactions in driving simulation experiments, and to assess how applicable driving simulation is to the real world for studies of vehicle dynamics or driver behaviour.In 1938 Gibson [1] proposed a psychophysical theory of perception for automobile-driving, defining a 'terrain of field of space' for the driver, with the car considered as a tool of locomotion and the driver aiming to drive in the middle of a 'field of safe travel'. In 1950 he described the visual perception of space [2] based on visual depth, distance or orientation stimulus variables. OPTIC FLOW, one of the most important visual cues he proposed, is defined as the visual motion experienced as a result of walking or driving, and it is thought to play a dominant role in the control of heading [3] and collision detection [4 -7]. However, regarding the control of the direction of movement in natural environments (i.e. walking), there is still disagreement over whether the structure of the flow [8,9] or the visual EGOCENTRIC DIRECTION per se [10,11] is the dominant source of information. It is not clear either whether the same strategies used for natural locomotion apply to driving situations where displacements occur at higher velocities. Interestingly, a new point of view on these controversial issues was recently provided by experiments performed in driving simulators [12]. However, Gibson's original theory also included a definition of the perceptual field of the car itself, bringing to the driver kinaesthetic and tactile cues. These ideas were applied to driving simulation from the early 1980s [13][14][15], and since then many simulator experiments have been carried out for...

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“…The results of two studies [24,25] have demonstrated that the CNS exploits extra-retinal signals elicited by self-motion to provide an absolute scale to the motion parallax visual information. Subjects were able to recover correctly the absolute distance of objects while moving their head (Fig.…”

Section: Large Field Vementioning

confidence: 99%

“…Conversely, an active observer is in principle able to recover the absolute distance of an object ffom the pure optic flow, if his/her CNS exploits the measurement of the 3D movement accompanying the retinal motion experienced. The first study tested the hypothesis that the CNS makes use of self-motion-related signals to scale the optic flow for determining the egocentric distance of objects [24]. TheVE framework was integrated to a large-field visual display comprising a high-resolution projector (BARCO) displaying images of 1280x 1024 pixels on a 200x250cm screen.…”

Section: Large Field Vementioning

confidence: 99%

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A VE framework to study visual perception and action

2002

Self Cite

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Abstract:In the real world, vision operates in harmony with self-motion yielding the observer to unambiguous perception of the three-dimensional (3D) space. In laboratory conditions, because of technical difficulties, researchers studying 3D perception have often preferred to use the substitute of a stationary observer, somehow neglecting aspects of the action-perception cycle. Recent results in visual psychophysics have proved that self-motion and visual processes interact, leading the moving observer to interpret a 3D virtual scene differently from a stationary observer, tn this paper we describe a virtual environment (VE) framework which presents very interesting characteristics for designing experiments in visual perception during action. These characteristics arise in a number of ways from the design of a unique motion capture device. First, its accuracy and the minimal latency in position measurement; second, its ease of use and the adaptability to different display interfaces. Such a VE framework enables the experimenter to recreate stimulation conditions characterised by a degree of sensory coherence typical of the real world. Moreover, because of its accuracy and flexibility, the same device can be used as a measurement tool to perform elementary but essential calibration procedures. The VE framework has been used to conduct two studies which compare the perception of 3D variables of the environment in moving and in stationary observers under monocular vision. The first study concerrls the perception of absolute distance, i.e. the distance separating an object and the observer. The second study refers to the perception of the orientation of a surface both in the absence and presence of conflicts between static and dynamic visual cues. In the two cases, the VE framework has enabled the design of optimal experimental conditions, permitting light to be shed on the role of action in 3D visual perception.

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Contribution of extraretinal signals to the scaling of object distance during self-motion

Cited by 24 publications

References 55 publications

Movement in the Perception of an Affordance for Wheelchair Locomotion

Movement in the Perception of an Affordance for Wheelchair Locomotion

Evaluating perception in driving simulation experiments

A VE framework to study visual perception and action

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