Intact spatial updating with severely degraded vision

Tarampi, Margaret R.; Creem-Regehr, Sarah H.; Thompson, William B.

doi:10.3758/app.72.1.23

Cited by 20 publications

(26 citation statements)

References 14 publications

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“…This finding agrees with previous work demonstrating equivalent performance in spatial updating when landmarks are viewed with or without blur [30]. The robustness of navigation behavior to degraded vision is consonant with the ubiquity of accurate spatial updating across phyla with markedly different acuity [31], but it remains an interesting puzzle that needs to be investigated further.…”

Section: Discussionsupporting

confidence: 90%

Combining Path Integration and Remembered Landmarks When Navigating without Vision

2013

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This study investigated the interaction between remembered landmark and path integration strategies for estimating current location when walking in an environment without vision. We asked whether observers navigating without vision only rely on path integration information to judge their location, or whether remembered landmarks also influence judgments. Participants estimated their location in a hallway after viewing a target (remembered landmark cue) and then walking blindfolded to the same or a conflicting location (path integration cue). We found that participants averaged remembered landmark and path integration information when they judged that both sources provided congruent information about location, which resulted in more precise estimates compared to estimates made with only path integration. In conclusion, humans integrate remembered landmarks and path integration in a gated fashion, dependent on the congruency of the information. Humans can flexibly combine information about remembered landmarks with path integration cues while navigating without visual information.

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Section: Discussionsupporting

confidence: 90%

Combining Path Integration and Remembered Landmarks When Navigating without Vision

2013

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“…This finding would be consistent with low vision literature that has shown intact static perception of objects and distances (i.e. Tarampi et al, 2010), as well as work in the low vision obstacle avoidance literature suggesting that mobility is only impaired at very extreme levels of degradation (Pelli, 1987)…”

Section: Methodssupporting

confidence: 90%

Spatial learning while navigating with severely degraded viewing: The role of attention and mobility monitoring.

Rand¹,

Creem-Regehr²,

Thompson³

2015

Journal of Experimental Psychology: Human Perception and Perfor

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The ability to navigate without getting lost is an important aspect of quality of life. In five studies, we evaluated how spatial learning is affected by the increased demands of keeping oneself safe while walking with degraded vision (mobility monitoring). We proposed that safe low-vision mobility requires attentional resources, providing competition for those needed to learn a new environment. In Experiments 1 and 2 participants navigated along paths in a real-world indoor environment with simulated degraded vision or normal vision. Memory for object locations seen along the paths was better with normal compared to degraded vision. With degraded vision, memory was better when participants were guided by an experimenter (low monitoring demands) versus unguided (high monitoring demands). In Experiments 3 and 4, participants walked while performing an auditory task. Auditory task performance was superior with normal compared to degraded vision. With degraded vision, auditory task performance was better when guided compared to unguided. In Experiment 5, participants performed both the spatial learning and auditory tasks under degraded vision. Results showed that attention mediates the relationship between mobility-monitoring demands and spatial learning. These studies suggest that more attention is required and spatial learning is impaired when navigating with degraded viewing.

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“…Recently, the accurate perception of absolute distance that has been found experimentally in normal vision (e.g. Loomis, Da Silva, Fujita, & Fukusima 1992; Philbeck & Loomis, 1997; Rieser, Ashmead, Talor, & Youngquist, 1990; Thomson, 1983) has been replicated in severely degraded viewing conditions (Tarampi, Creem-Regehr, & Thompson, 2010). While these experiments provide important baseline information about absolute distance perception with severely degraded vision, judgments were made in simple environments to single targets located on the ground plane.…”

mentioning

confidence: 86%

The Influence of Ground Contact and Visible Horizon on Perception of Distance and Size under Severely Degraded Vision

Rand¹,

Tarampi²,

Creem-Regehr³

et al. 2012

Seeing and Perceiving

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For low vision navigation, misperceiving the locations of hazards can have serious consequences. Potential sources of such misperceptions are hazards that are not visually associated with the ground plane, thus, depriving the viewer of important perspective cues for egocentric distance. In Experiment 1, we assessed absolute distance and size judgments to targets on stands under degraded vision conditions. Normally sighted observers wore blur goggles that severely reduced acuity and contrast, and viewed targets placed on either detectable or undetectable stands. Participants in the detectable stand condition demonstrated accurate distance judgments, whereas participants in the undetectable stand condition overestimated target distances. Similarly, the perceived size of targets in the undetectable stand condition was judged to be significantly larger than in the detectable stand condition, suggesting a perceptual coupling of size and distance in conditions of degraded vision. In Experiment 2, we investigated size and implied distance perception of targets elevated above a visible horizon for individuals in an induced state of degraded vision. When participants’ size judgments are inserted into the size–distance invariance hypothesis (SDIH) formula, distance to above-horizon objects increased compared to those below the horizon. Together, our results emphasize the importance of salient visible ground-contact information for accurate distance perception. The absence of this ground-contact information could be the source of perceptual errors leading to potential hazards for low vision individuals with severely degraded acuity and contrast sensitivity.

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Intact spatial updating with severely degraded vision

Cited by 20 publications

References 14 publications

Combining Path Integration and Remembered Landmarks When Navigating without Vision

Combining Path Integration and Remembered Landmarks When Navigating without Vision

Spatial learning while navigating with severely degraded viewing: The role of attention and mobility monitoring.

The Influence of Ground Contact and Visible Horizon on Perception of Distance and Size under Severely Degraded Vision

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