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Reduced fields of view are neither necessary nor sufficient for distance underestimation but reduce precision and may cause calibration problems

Identifieur interne : 006B45 ( Main/Curation ); précédent : 006B44; suivant : 006B46

Reduced fields of view are neither necessary nor sufficient for distance underestimation but reduce precision and may cause calibration problems

Auteurs : Andrea Loftus [Royaume-Uni] ; Susannah Murphy [Royaume-Uni] ; Isla Mckenna [Royaume-Uni] ; Mark Mon-Williams [Royaume-Uni]

Source :

Experimental brain research [ 0014-4819 ] ; 2004.

RBID : Pascal:05-0153828

Descripteurs français

Pascal (Inist)
- Mouvement corporel, Préhension, Précision, Mouvement orienté, Cinématique, Mémoire, Vision, Stimulus visuel, Distance stimulus, Rétroaction, Variabilité, Homme, Contrôle moteur, Tâche pointage, Perception haptique.
Wicri :
- topic : Homme.

English descriptors

KwdEn :
- Accuracy, Arm (innervation), Arm (physiology), Biomechanical Phenomena, Body movement, Cues, Depth Perception (physiology), Feedback (physiology), Feedback regulation, Goal directed movement, Gripping, Haptic perception, Human, Humans, Kinematics, Memory, Motor control, Neuropsychological Tests, Observer Variation, Orientation (physiology), Photic Stimulation, Pointing task, Psychomotor Performance (physiology), Sensory Deprivation (physiology), Space Perception (physiology), Stimulus distance, Variability, Vision, Visual Fields (physiology), Visual stimulus.
MESH :
- innervation : Arm.
- physiology : Arm, Depth Perception, Feedback, Orientation, Psychomotor Performance, Sensory Deprivation, Space Perception, Visual Fields.
- Biomechanical Phenomena, Cues, Humans, Neuropsychological Tests, Observer Variation, Photic Stimulation.

Abstract

Watt et al. (Exp Brain Res, 2000, 135:411-416) suggested that a reduced field of view causes objects to appear closer than their physical distance. This suggestion is based on the observation that individuals terminated open-loop prehension prematurely when pretending to grasp a paper rectangle initially viewed through a reduced field of view. We tested Watt et al.'s suggestion in an open-loop pointing task. In experiment 1, 21 participants pointed at targets in three locations (20, 30 and 40 cm relative to the starting position) in three viewing conditions (full, 16° and 4° field of view). No difference in accuracy was found between conditions but the reduced field of view led to an increase in end-point variability across trials. We interpret these results as indicating that a reduced field of view decreases precision but does not necessarily affect object localisation. In experiment 2, we asked participants to reach-and-grasp a real object under the same three open-loop viewing conditions but without vision following movement onset. The experimental design ensured that haptic feedback was available, which could be used to calibrate reaching movements. We found that the reduced field of view caused no changes in grasp but we observed changes in the transport kinematics consistent with increased variability in the perceptual estimate of target location. Notably there were no changes in the spatial path (expected from movements to a closer location). In experiment 3, we repeated the Watt et al. design but removed vision and forced participants to rely on memory. In this condition we found the same undershoots as described by Watt et al. We conclude that a reduced field of view is neither necessary nor sufficient for underestimation and suggest that a reduced field of view decreases precision. This can cause participants to undershoot and/or alter the movement kinematics but we argue that such findings cannot be ascribed unambiguously to perceptual underestimation as they may reflect strategic alterations in behaviour.

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Watt et al. (Exp Brain Res, 2000, 135:411-416) suggested that a reduced field of view causes objects to appear closer than their physical distance. This suggestion is based on the observation that individuals terminated open-loop prehension prematurely when pretending to grasp a paper rectangle initially viewed through a reduced field of view. We tested Watt et al.'s suggestion in an open-loop pointing task. In experiment 1, 21 participants pointed at targets in three locations (20, 30 and 40 cm relative to the starting position) in three viewing conditions (full, 16° and 4° field of view). No difference in accuracy was found between conditions but the reduced field of view led to an increase in end-point variability across trials. We interpret these results as indicating that a reduced field of view decreases precision but does not necessarily affect object localisation. In experiment 2, we asked participants to reach-and-grasp a real object under the same three open-loop viewing conditions but without vision following movement onset. The experimental design ensured that haptic feedback was available, which could be used to calibrate reaching movements. We found that the reduced field of view caused no changes in grasp but we observed changes in the transport kinematics consistent with increased variability in the perceptual estimate of target location. Notably there were no changes in the spatial path (expected from movements to a closer location). In experiment 3, we repeated the Watt et al. design but removed vision and forced participants to rely on memory. In this condition we found the same undershoots as described by Watt et al. We conclude that a reduced field of view is neither necessary nor sufficient for underestimation and suggest that a reduced field of view decreases precision. This can cause participants to undershoot and/or alter the movement kinematics but we argue that such findings cannot be ascribed unambiguously to perceptual underestimation as they may reflect strategic alterations in behaviour.</div>
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<front><div type="abstract" xml:lang="en">Watt et al. (Exp Brain Res, 2000, 135:411-416) suggested that a reduced field of view causes objects to appear closer than their physical distance. This suggestion is based on the observation that individuals terminated open-loop prehension prematurely when pretending to grasp a paper rectangle initially viewed through a reduced field of view. We tested Watt et al.'s suggestion in an open-loop pointing task. In experiment 1, 21 participants pointed at targets in three locations (20, 30 and 40 cm relative to the starting position) in three viewing conditions (full, 16° and 4° field of view). No difference in accuracy was found between conditions but the reduced field of view led to an increase in end-point variability across trials. We interpret these results as indicating that a reduced field of view decreases precision but does not necessarily affect object localisation. In experiment 2, we asked participants to reach-and-grasp a real object under the same three open-loop viewing conditions but without vision following movement onset. The experimental design ensured that haptic feedback was available, which could be used to calibrate reaching movements. We found that the reduced field of view caused no changes in grasp but we observed changes in the transport kinematics consistent with increased variability in the perceptual estimate of target location. Notably there were no changes in the spatial path (expected from movements to a closer location). In experiment 3, we repeated the Watt et al. design but removed vision and forced participants to rely on memory. In this condition we found the same undershoots as described by Watt et al. We conclude that a reduced field of view is neither necessary nor sufficient for underestimation and suggest that a reduced field of view decreases precision. This can cause participants to undershoot and/or alter the movement kinematics but we argue that such findings cannot be ascribed unambiguously to perceptual underestimation as they may reflect strategic alterations in behaviour.</div>
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<affiliation wicri:level="1"><nlm:affiliation>School of Psychology, William Guild Building, University of Aberdeen, Aberdeen, AB24 2UB, UK.</nlm:affiliation>
<country xml:lang="fr">Royaume-Uni</country>
<wicri:regionArea>School of Psychology, William Guild Building, University of Aberdeen, Aberdeen, AB24 2UB</wicri:regionArea>
<wicri:noRegion>AB24 2UB</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Murphy, Susannah" sort="Murphy, Susannah" uniqKey="Murphy S" first="Susannah" last="Murphy">Susannah Murphy</name>
</author>
<author><name sortKey="Mckenna, Isla" sort="Mckenna, Isla" uniqKey="Mckenna I" first="Isla" last="Mckenna">Isla Mckenna</name>
</author>
<author><name sortKey="Mon Williams, Mark" sort="Mon Williams, Mark" uniqKey="Mon Williams M" first="Mark" last="Mon-Williams">Mark Mon-Williams</name>
</author>
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<date when="2004">2004</date>
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<idno type="doi">10.1007/s00221-004-1900-7</idno>
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<sourceDesc><biblStruct><analytic><title xml:lang="en">Reduced fields of view are neither necessary nor sufficient for distance underestimation but reduce precision and may cause calibration problems.</title>
<author><name sortKey="Loftus, Andrea" sort="Loftus, Andrea" uniqKey="Loftus A" first="Andrea" last="Loftus">Andrea Loftus</name>
<affiliation wicri:level="1"><nlm:affiliation>School of Psychology, William Guild Building, University of Aberdeen, Aberdeen, AB24 2UB, UK.</nlm:affiliation>
<country xml:lang="fr">Royaume-Uni</country>
<wicri:regionArea>School of Psychology, William Guild Building, University of Aberdeen, Aberdeen, AB24 2UB</wicri:regionArea>
<wicri:noRegion>AB24 2UB</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Murphy, Susannah" sort="Murphy, Susannah" uniqKey="Murphy S" first="Susannah" last="Murphy">Susannah Murphy</name>
</author>
<author><name sortKey="Mckenna, Isla" sort="Mckenna, Isla" uniqKey="Mckenna I" first="Isla" last="Mckenna">Isla Mckenna</name>
</author>
<author><name sortKey="Mon Williams, Mark" sort="Mon Williams, Mark" uniqKey="Mon Williams M" first="Mark" last="Mon-Williams">Mark Mon-Williams</name>
</author>
</analytic>
<series><title level="j">Experimental brain research</title>
<idno type="ISSN">0014-4819</idno>
<imprint><date when="2004" type="published">2004</date>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Arm (innervation)</term>
<term>Arm (physiology)</term>
<term>Biomechanical Phenomena</term>
<term>Cues</term>
<term>Depth Perception (physiology)</term>
<term>Feedback (physiology)</term>
<term>Humans</term>
<term>Neuropsychological Tests</term>
<term>Observer Variation</term>
<term>Orientation (physiology)</term>
<term>Photic Stimulation</term>
<term>Psychomotor Performance (physiology)</term>
<term>Sensory Deprivation (physiology)</term>
<term>Space Perception (physiology)</term>
<term>Visual Fields (physiology)</term>
</keywords>
<keywords scheme="MESH" qualifier="innervation" xml:lang="en"><term>Arm</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Arm</term>
<term>Depth Perception</term>
<term>Feedback</term>
<term>Orientation</term>
<term>Psychomotor Performance</term>
<term>Sensory Deprivation</term>
<term>Space Perception</term>
<term>Visual Fields</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Biomechanical Phenomena</term>
<term>Cues</term>
<term>Humans</term>
<term>Neuropsychological Tests</term>
<term>Observer Variation</term>
<term>Photic Stimulation</term>
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<front><div type="abstract" xml:lang="en">Watt et al. (Exp Brain Res, 2000, 135:411-416) suggested that a reduced field of view causes objects to appear closer than their physical distance. This suggestion is based on the observation that individuals terminated open-loop prehension prematurely when pretending to grasp a paper rectangle initially viewed through a reduced field of view. We tested Watt et al.'s suggestion in an open-loop pointing task. In experiment 1, 21 participants pointed at targets in three locations (20, 30 and 40 cm relative to the starting position) in three viewing conditions (full, 16 degrees and 4 degrees field of view). No difference in accuracy was found between conditions but the reduced field of view led to an increase in end-point variability across trials. We interpret these results as indicating that a reduced field of view decreases precision but does not necessarily affect object localisation. In experiment 2, we asked participants to reach-and-grasp a real object under the same three open-loop viewing conditions but without vision following movement onset. The experimental design ensured that haptic feedback was available, which could be used to calibrate reaching movements. We found that the reduced field of view caused no changes in grasp but we observed changes in the transport kinematics consistent with increased variability in the perceptual estimate of target location. Notably there were no changes in the spatial path (expected from movements to a closer location). In experiment 3, we repeated the Watt et al. design but removed vision and forced participants to rely on memory. In this condition we found the same undershoots as described by Watt et al. We conclude that a reduced field of view is neither necessary nor sufficient for underestimation and suggest that a reduced field of view decreases precision. This can cause participants to undershoot and/or alter the movement kinematics but we argue that such findings cannot be ascribed unambiguously to perceptual underestimation as they may reflect strategic alterations in behaviour.</div>
</front>
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Reduced fields of view are neither necessary nor sufficient for distance underestimation but reduce precision and may cause calibration problems

Reduced fields of view are neither necessary nor sufficient for distance underestimation but reduce precision and may cause calibration problems

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