Influence of contact cues on the perception of the oculogravic illusion.

Clark, Brant; Graybiel, Ashton

doi:10.1037/e438012004-001

Cited by 4 publications

(3 citation statements)

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“…It is well-known that SV is not only influenced by the visual frame, but also by body tilt (Scho« ne 1964) and by modifications of the gravitational field (Clark and Graybiel 1968). This clearly suggests that all the reference frames mentioned above are potentially involved in the perceptual elaboration of the SV.…”

Section: The Subjective Vertical As the Results Of A Combination Betwementioning

confidence: 86%

Interaction between Reference Frames during Subjective Vertical Estimates in a Tilted Immersive Virtual Environment

et al. 2009

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Numerous studies highlighted the influence of a tilted visual frame on the perception of the visual vertical ('rod-and-frame effect' or RFE). Here, we investigated whether this influence can be modified in a virtual immersive environment (CAVE-like) by the structure of the visual scene and by the adjustment mode allowing visual or visuo-kinaesthetic control (V and VK mode, respectively). The way this influence might dynamically evolve throughout the adjustment was also investigated in two groups of subjects with the head unrestrained or restrained upright. RFE observed in the immersive environment was qualitatively comparable to that obtained in a real display (portable rod-and-frame test; Oltman 1968, Perceptual and Motor Skills 26 503-506). Moreover, RFE in the immersive environment appeared significantly influenced by the structure of the visual scene and by the adjustment mode: the more geometrical and meaningful 3-D features the visual scene contained, the greater the RFE. The RFE was also greater when the subjective vertical was assessed under visual control only, as compared to visuo-kinaesthetic control. Furthermore, the results showed a significant RFE increase throughout the adjustment, indicating that the influence of the visual scene upon subjective vertical might dynamically evolve over time. The latter effect was more pronounced for structured visual scenes and under visuo-kinaesthetic control. On the other hand, no difference was observed between the two groups of subjects having the head restrained or unrestrained. These results are discussed in terms of dynamic combination between coexisting reference frames for spatial orientation.

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Section: The Subjective Vertical As the Results Of A Combination Betwementioning

confidence: 86%

Interaction between Reference Frames during Subjective Vertical Estimates in a Tilted Immersive Virtual Environment

et al. 2009

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“…It is well known that tilt and linear acceleration are ambiguous in the absence of semicircular canal input (Clark and Graybiel 1968; Seidman et al 1998; Carriot et al 2006) as linear acceleration can represent either tilt or translation (Guedry 1974). It has been shown that high frequency acceleration is usually interpreted as translation while lower frequency acceleration is interpreted as tilt (Paige and Tomko 1991) even when semicircular canal stimulation is absent (Graybiel et al 1979; Seidman et al 1998).…”

Section: Discussionmentioning

confidence: 99%

Roll aftereffects: influence of tilt and inter-stimulus interval

Crane

2012

Exp Brain Res

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A theme in sensory perception it that exposure to a stimulus causes perception of subsequent stimuli to be shifted in the opposite direction. Such phenomenon are known as aftereffects and have been extensively described in the visual system as well as recently described for the vestibular system during translation. It is known from aviation studies that after a maneuver in roll pilots can experience a false perception of roll in the opposite direction. The magnitude and duration of this effect as well as the potential influence of the gravity vector have not previously been defined. In the current paper this roll aftereffect (RAE) is examined in response to whole body roll about an earth-horizontal axis in eight healthy human subjects. The peak velocity of a 0.5 s duration roll was varied based on previous responses to find the point where subjects perceived no motion. Without an preceding stimulus the starting position (upright, 9° left, or 9° right) did not influence roll perception. The RAE was measured in a completely dark room using an adapting (firstinterval) stimulus consisting of 9° of roll over 1.5 s (peak velocity 12°/s), delivered 0.5, 3, or 6s prior to test (second-interval) stimulus. A significant RAE was seen in all subjects. Half a second after the adapting stimulus a test stimulus had to be on average 1.5 ± 0.4°/s in the opposite direction to be perceived as stationary. When the subject remained upright after the adapting stimulus the RAE diminished with time, although it remained significantly larger at 3s and 6s when the subject remained tilted after the adapting stimulus. These data demonstrate that roll perception can be influenced by small preceding stimuli and tilt causes a persistence of the RAE.

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“…This hypothesis would account for the lower than expected errors in subjective vertical (SV), that are induced not only by alteration of various FORs, e.g., tilt of the visual frame [27], [37], [53], but also by body tilt [54], modifications of the gravitational field [55] or even the alteration of trunk mass distribution [1]. With this view, and in line with the present results, SHO is neither perfectly lined up with the egocentric FOR, nor with the visual FOR.…”

Section: Discussionmentioning

confidence: 99%

Does the Integration of Haptic and Visual Cues Reduce the Effect of a Biased Visual Reference Frame on the Subjective Head Orientation?

2012

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BackgroundThe selection of appropriate frames of reference (FOR) is a key factor in the elaboration of spatial perception and the production of robust interaction with our environment. The extent to which we perceive the head axis orientation (subjective head orientation, SHO) with both accuracy and precision likely contributes to the efficiency of these spatial interactions. A first goal of this study was to investigate the relative contribution of both the visual and egocentric FOR (centre-of-mass) in the SHO processing. A second goal was to investigate humans' ability to process SHO in various sensory response modalities (visual, haptic and visuo-haptic), and the way they modify the reliance to either the visual or egocentric FORs. A third goal was to question whether subjects combined visual and haptic cues optimally to increase SHO certainty and to decrease the FORs disruption effect.Methodology/Principal FindingsThirteen subjects were asked to indicate their SHO while the visual and/or egocentric FORs were deviated. Four results emerged from our study. First, visual rod settings to SHO were altered by the tilted visual frame but not by the egocentric FOR alteration, whereas no haptic settings alteration was observed whether due to the egocentric FOR alteration or the tilted visual frame. These results are modulated by individual analysis. Second, visual and egocentric FOR dependency appear to be negatively correlated. Third, the response modality enrichment appears to improve SHO. Fourth, several combination rules of the visuo-haptic cues such as the Maximum Likelihood Estimation (MLE), Winner-Take-All (WTA) or Unweighted Mean (UWM) rule seem to account for SHO improvements. However, the UWM rule seems to best account for the improvement of visuo-haptic estimates, especially in situations with high FOR incongruence. Finally, the data also indicated that FOR reliance resulted from the application of UWM rule. This was observed more particularly, in the visual dependent subject. Conclusions: Taken together, these findings emphasize the importance of identifying individual spatial FOR preferences to assess the efficiency of our interaction with the environment whilst performing spatial tasks.

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Influence of contact cues on the perception of the oculogravic illusion.

Cited by 4 publications

References 4 publications

Interaction between Reference Frames during Subjective Vertical Estimates in a Tilted Immersive Virtual Environment

Interaction between Reference Frames during Subjective Vertical Estimates in a Tilted Immersive Virtual Environment

Roll aftereffects: influence of tilt and inter-stimulus interval

Does the Integration of Haptic and Visual Cues Reduce the Effect of a Biased Visual Reference Frame on the Subjective Head Orientation?

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