scholarly journals Motor adaptations for object size perception and grasping

2021 ◽  
Vol 21 (9) ◽  
pp. 2258
Author(s):  
Pablo Sanz Diez ◽  
Annalisa Bosco ◽  
Patrizia Fattori ◽  
Siegfried Wahl
Keyword(s):  
Size Perception ◽  
Object Size

scholarly journals Embodiment in a Child-Like Talking Virtual Body Influences Object Size Perception, Self-Identification, and Subsequent Real Speaking

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Ana Tajadura-Jiménez ◽  
Domna Banakou ◽  
Nadia Bianchi-Berthouze ◽  
Mel Slater
Keyword(s):  
Size Perception ◽  
Object Size ◽  
Virtual Body

scholarly journals Representation of Object Size in the Somatosensory System

2006 ◽  
Vol 96 (1) ◽  
pp. 27-39 ◽  
Author(s):  
L. J. Berryman ◽  
J. M. Yau ◽  
S. S. Hsiao
Keyword(s):  
Contact Force ◽  
Somatosensory System ◽  
Size Perception ◽  
Initial Contact ◽  
Proprioceptive Information ◽  
Object Size ◽  
The Third ◽  
Individual Contributions ◽  
Proprioceptive Afferents ◽  
The Individual

In this study we investigate the haptic perception of object size. We report the results from four psychophysical experiments. In the first, we ask subjects to discriminate the size of objects that vary in surface curvature and compliance while changing contact force. We show that objects exhibit size constancy such that perception of object size using haptics does not change with changes in contact force. Based on these results, we hypothesize that size perception depends on the degree of spread between the digits at initial contact with objects. In the second experiment, we test this hypothesis by having subjects continuously contact an object that changes dynamically in size. We show that size perception takes into account the compliance of the object. In the third and fourth experiments we attempt to separate the individual contributions of proprioceptive and cutaneous input. In the third, we test the ability of subjects to perceive object size after altering the sensitivity of cutaneous receptors with adapting vibratory stimuli. The results from this experiment suggest that initial contact is signaled by the cutaneous slowly adapting type 1 afferents (SA1) and/or the rapidly adapting afferents (RA). In the last experiment, we block cutaneous input at the site of contact by anesthetizing the digital nerves and show that proprioceptive information alone provides only a rough estimate of object size. We conclude that the perception of object size depends on inputs from SA1 and possibly RA afferents, combined with inputs from proprioceptive afferents that signal the spread between digits.

scholarly journals Grasp aperture corrections in reach-to-grasp movements do not reliably alter size perception

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0248084
Author(s):  
Vonne van Polanen
Keyword(s):  
Visual Information ◽  
Discrimination Performance ◽  
Perceptual Bias ◽  
Size Perception ◽  
Object Size ◽  
Haptic Information ◽  
Reach To Grasp ◽  
Grip Aperture ◽  
Reaching Movement ◽  
The Difference

When grasping an object, the opening between the fingertips (grip aperture) scales with the size of the object. If an object changes in size, the grip aperture has to be corrected. In this study, it was investigated whether such corrections would influence the perceived size of objects. The grasping plan was manipulated with a preview of the object, after which participants initiated their reaching movement without vision. In a minority of the grasps, the object changed in size after the preview and participants had to adjust their grasping movement. Visual feedback was manipulated in two experiments. In experiment 1, vision was restored during reach and both visual and haptic information was available to correct the grasp and lift the object. In experiment 2, no visual information was provided during the movement and grasps could only be corrected using haptic information. Participants made reach-to-grasp movements towards two objects and compared these in size. Results showed that participants adjusted their grasp to a change in object size from preview to grasped object in both experiments. However, a change in object size did not bias the perception of object size or alter discrimination performance. In experiment 2, a small perceptual bias was found when objects changed from large to small. However, this bias was much smaller than the difference that could be discriminated and could not be considered meaningful. Therefore, it can be concluded that the planning and execution of reach-to-grasp movements do not reliably affect the perception of object size.

scholarly journals Grasp Aperture Corrections in Reach-to-Grasp Movements Do Not Alter Size Perception

2021 ◽  
Author(s):  
Vonne van Polanen
Keyword(s):  
Visual Information ◽  
Discrimination Performance ◽  
Perceptual Bias ◽  
Size Perception ◽  
Object Size ◽  
Haptic Information ◽  
Reach To Grasp ◽  
Grip Aperture ◽  
Reaching Movement ◽  
The Difference

ABSTRACTWhen grasping an object, the opening between the fingertips (grip aperture) scales with the size of the object. If an object changes in size, the grip aperture has to be corrected. In this study, it was investigated whether such corrections would influence the perceived size of objects. The grasping plan was manipulated with a preview of the object, after which participants initiated their reaching movement without vision. In a minority of the grasps, the object changed in size after the preview and participants had to adjust their grasping movement. Visual feedback was manipulated in two experiments. In experiment 1, vision was restored during reach and both visual and haptic information was available to correct the grasp and lift the object. In experiment 2, no visual information was provided during the movement and grasps could only be corrected using haptic information. Participants made reach-to-grasp movements towards two objects and compared these in size. Results showed that participants adjusted their grasp to a change in object size from preview to grasped object in both experiments. However, a change in object size did not bias the perception of object size or alter discrimination performance. In experiment 2, a small perceptual bias was found when objects changed from large to small. However, this bias was much smaller than the difference that could be discriminated and could not be considered meaningful. Therefore, it can be concluded that the planning and execution of reach-to-grasp movements do not affect the perception of object size.

scholarly journals Active touch facilitates object size perception in children but not adults: A multisensory event related potential study

2019 ◽  
Vol 1723 ◽  
pp. 146381
Author(s):  
Meike Scheller ◽  
Sara Garcia ◽  
Joe Bathelt ◽  
Michelle de Haan ◽  
Karin Petrini
Keyword(s):  
Active Touch ◽  
Event Related Potential ◽  
Size Perception ◽  
Object Size ◽  
Potential Study

scholarly journals The influence of dialect in sound symbolic size perception

2018 ◽  
Vol 3 (1) ◽  
pp. 30
Author(s):  
Andrew Shibata
Keyword(s):  
American English ◽  
Sound Symbolism ◽  
Size Perception ◽  
English Speakers ◽  
Object Size ◽  
Front Vowel ◽  
Reading Task ◽  
Back Vowel ◽  
Listening Task ◽  
Referent Object

Prior research on sound symbolism and referent object size establishes that words with front vowels are perceived to refer to smaller objects than do back vowels (Ohala 1997; Klink 2000). Some dialects of American English exhibit vowel movement along the front-back axis which may influence perceived object size. This study focuses on California English /u/-fronting (Hinton et al. 1987) and predicts that shifting from a standardly back vowel [u] to a more front vowel [ʉ] is paired with a shift from a large perceived object size to a smaller perceived object size. This paper describes two experiments in which participants either silently read (reading task) or listened (listening task) to stimulus words and rated perceived object size. California English speakers in the reading task experiment perceived words with /u/ to be smaller than did non-California English speakers. This result suggests that sound symbolic perception is sensitive to fine phonetic variability due to a person’s dialect.

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