Cited by 249Visual perception and processing mechanismsMotor Control and AdaptationTactile and Sensory Interactions

Contribution of retinal versus extraretinal signals towards visual localization in goal-directed movements

Bock, O.·1986·Experimental Brain Research

Abstract

In human subjects, we investigated the accuracy of goal-directed arm movements performed without sight of the arm; errors of target localization and of motor control thus remained uncorrected by visual feedback, and became manifest as pointing errors. Target position was provided either as retinal eccentricity or as eye position. By comparing the results to those obtained previously with combined retinal plus extraretinal position cues, the relative contribution of the two signals towards visual localization could be studied. When target position was provided by retinal signals, pointing responses revealed an over-estimation of retinal eccentricity which was of similar size for all eccentricities tested, and was independent of gaze direction. These findings were interpreted as a magnification effect of perifoveal retinal areas. When target position was provided as eye position, pointing was characterized by a substantial inter-, and intra-subject variability, suggesting that the accuracy of localization by extraretinal signals is rather limited. In light of these two qualitatively different deficits, possible mechanisms are discussed how the two signals may interact towards a more veridical visual localization.

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Crossref · 10.1007/bf00340484

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Authors
Bock, O.
Affiliations
Heinrich Heine University Düsseldorf (DE)
Corresponding author
Bock, O.
Venue
Experimental Brain Research
Published
1986-11
Volume
64
Issue
3
Pages
476-482
ISSN
  • 0014-4819 (ISSN-L)
  • 1432-1106
OpenAlex
W1974849418
Cited by
249
References
30
Citations by year
2025: 1 · 2024: 5 · 2023: 2 · 2022: 5 · 2021: 4 · 2020: 4 · 2019: 6 · 2018: 3 · 2017: 10 · 2016: 2 · 2015: 6 · 2014: 8 · 2013: 4 · 2012: 10
FWCI
0.28
Type
journal article
Language
en
Open access
closed
Locations
  • Experimental Brain Research (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Motor Control and Adaptation
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Tactile and Sensory Interactions
Keywords
visual localization, retinal signals, extraretinal signals, goal-directed arm movements, pointing errors, retinal eccentricity, visual feedback, gaze direction, motor control
MeSH terms
Arm, Cues, Humans, Psychomotor Performance, Retina, Space Perception, Visual Cortex, Visual Fields

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