Are All Spatial Reference Frames Egocentric? Reinterpreting Evidence for Allocentric, Object-Centered, or World-Centered Reference Frames

Filimon, Flavia

doi:10.3389/fnhum.2015.00648

Cited by 83 publications

(93 citation statements)

References 107 publications

(232 reference statements)

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“…Whether exocentric and egocentric navigation processes are independent is not fully established and is an area of active research. [42–44] Mobility disabled patients may not be able to do the FMT, and alternate navigational tasks need to be developed for this subgroup.…”

Section: Discussionmentioning

confidence: 99%

Spatial navigation and risk of cognitive impairment: A prospective cohort study

Verghese

Lipton

Ayers

2017

Alzheimer's & Dementia

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INTRODUCTION Spatial navigation deficits are reported in dementia, but their temporal relationship to cognitive decline is not established. METHODS Prospective cohort study in 442 non-demented adults (mean age 79.9 years). Spatial navigation measured with the Floor Maze Test, and reported as immediate maze time (IMT) and delayed maze time (DMT). Pre-dementia syndromes, Mild Cognitive Impairment (MCI) and Motoric Cognitive Risk (MCR) syndromes, were primary outcomes. RESULTS Over a mean follow-up of 16.5 ± 13.7 months, 41 participants developed MCI and 30 MCR. In Cox models adjusted for age, sex, education, cognitive status, comorbid illnesses, and maze errors, a 10-second increment on IMT predicted incident MCI (adjusted hazard ratio [aHR] 1.25; 95% CI 1.06 to 1.48) and MCR (aHR 1.53; 95% CI 1.23 to 1.90). DMT predicted MCR but not MCI. DISCUSSION Spatial navigation performance predicted pre-dementia syndromes in aging, and implicates navigational impairments as an early feature in dementias.

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Section: Discussionmentioning

confidence: 99%

Spatial navigation and risk of cognitive impairment: A prospective cohort study

Verghese

Lipton

Ayers

2017

Alzheimer's & Dementia

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“…The involvement of temporal cortex in reach coding appears to contradict mainstream accounts of perception–action decoupling, but it has been argued that this depends on a memory delay, such as those used in our studies. It has also been argued that all spatial representations are ultimately egocentric . While this may well be true, there does seem to be a special need for coupling representations for landmark‐centered coding, in a way that maintains their specific relative spatial configurations.…”

Section: Functional Overview Of Allocentric Egocentric and Allo‐to‐mentioning

confidence: 99%

Allocentric representations for target memory and reaching in human cortex

Chen

Crawford

2019

Annals of the New York Academy of Sciences

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The use of allocentric cues for movement guidance is complex because it involves the integration of visual targets and independent landmarks and the conversion of this information into egocentric commands for action. Here, we focus on the mechanisms for encoding reach targets relative to visual landmarks in humans. First, we consider the behavioral results suggesting that both of these cues influence target memory, but are then transformed—at the first opportunity—into egocentric commands for action. We then consider the cortical mechanisms for these behaviors. We discuss different allocentric versus egocentric mechanisms for coding of target directional selectivity in memory (inferior temporal gyrus versus superior occipital gyrus) and distinguish these mechanisms from parieto‐frontal activation for planning egocentric direction of actual reach movements. Then, we consider where and how the former allocentric representations of remembered reach targets are converted into the latter egocentric plans. In particular, our recent neuroimaging study suggests that four areas in the parietal and frontal cortex (right precuneus, bilateral dorsal premotor cortex, and right presupplementary area) participate in this allo‐to‐ego conversion. Finally, we provide a functional overview describing how and why egocentric and landmark‐centered representations are segregated early in the visual system, but then reintegrated in the parieto‐frontal cortex for action.

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“…It requires spatial information to be mentally converted from the exocentric to the egocentric perspective. This helps the user develop comprehensive spatial cognitive maps [43]. While navigating with a exocentric map, users often need more cognitive processes such as mental rotation and zooming to establish correspondence between the map and the real world view [44].…”

Section: Human Factors Studymentioning

confidence: 99%

Augmented-Reality-Based Indoor Navigation: A Comparative Analysis of Handheld Devices Versus Google Glass

Rehman

Cao

2016

IEEE Trans. Human-Mach. Syst.

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Abstract-Navigation systems have been widely used in outdoor environments, but indoor navigation systems are still in early development stages. In this paper, we introduced an augmented reality-based indoor navigation application to assist people navigate in indoor environments. The application can be implemented on electronic devices such as a smartphone or a head-mounted device. In particular, we examined Google Glass as a wearable head-mounted device in comparison to handheld navigation aids including a smartphone and a paper map. We conducted both a technical assessment study and a human factors study. The technical assessment established the feasibility and reliability of the system. The human factors study evaluated human-machine system performance measures including perceived accuracy, navigation time, subjective comfort, subjective workload, and route memory retention. The results showed that the wearable device was perceived to be more accurate, but other performance and workload results indicated that the wearable device was not significantly different from the handheld smartphone. We also found that both digital navigation aids were better than the paper map in terms of shorter navigation time and lower workload, but digital navigation aids resulted in worse route retention. These results could provide empirical evidence supporting future designs of indoor navigation systems. Implications and future research were also discussed.

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Are All Spatial Reference Frames Egocentric? Reinterpreting Evidence for Allocentric, Object-Centered, or World-Centered Reference Frames

Cited by 83 publications

References 107 publications

Spatial navigation and risk of cognitive impairment: A prospective cohort study

Spatial navigation and risk of cognitive impairment: A prospective cohort study

Allocentric representations for target memory and reaching in human cortex

Augmented-Reality-Based Indoor Navigation: A Comparative Analysis of Handheld Devices Versus Google Glass

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