Cargando…

Aging and haptic shape discrimination: the effects of variations in size

Seventy-two older and younger adults haptically discriminated the solid shape of natural objects (bell peppers, Capsicum annuum). Plastic copies of the original-sized fruits were used as experimental stimuli, as well as copies that were reduced in size to 1/8th and 1/27th of the original object volu...

Descripción completa

Detalles Bibliográficos
Autores principales: Norman, J. Farley, Dukes, Jessica M., Palmore, Tori N.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7477202/
https://www.ncbi.nlm.nih.gov/pubmed/32895441
http://dx.doi.org/10.1038/s41598-020-71894-y
_version_ 1783579848214577152
author Norman, J. Farley
Dukes, Jessica M.
Palmore, Tori N.
author_facet Norman, J. Farley
Dukes, Jessica M.
Palmore, Tori N.
author_sort Norman, J. Farley
collection PubMed
description Seventy-two older and younger adults haptically discriminated the solid shape of natural objects (bell peppers, Capsicum annuum). Plastic copies of the original-sized fruits were used as experimental stimuli, as well as copies that were reduced in size to 1/8th and 1/27th of the original object volumes. If haptic object shape is represented in a part-based manner, then haptic shape discrimination performance should be at least partly size invariant, since changes only in scale do not affect an object’s constituent parts. On any given trial, participants sequentially explored two bell pepper replicas and were required to judge whether they possessed the same shape or had different shapes. For some participants, the objects to be discriminated possessed the same size, while for others, the two objects had different sizes. It was found that variations in scale did significantly reduce the participants’ haptic sensitivities to shape. Nevertheless, the discrimination performance obtained for large variations in size was no lower than that obtained for smaller variations in size. The results also demonstrated that increases in age modestly affect haptic shape discrimination performance: the d′ values of the older participants were 15.5% lower than those of the younger participants.
format Online
Article
Text
id pubmed-7477202
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-74772022020-09-08 Aging and haptic shape discrimination: the effects of variations in size Norman, J. Farley Dukes, Jessica M. Palmore, Tori N. Sci Rep Article Seventy-two older and younger adults haptically discriminated the solid shape of natural objects (bell peppers, Capsicum annuum). Plastic copies of the original-sized fruits were used as experimental stimuli, as well as copies that were reduced in size to 1/8th and 1/27th of the original object volumes. If haptic object shape is represented in a part-based manner, then haptic shape discrimination performance should be at least partly size invariant, since changes only in scale do not affect an object’s constituent parts. On any given trial, participants sequentially explored two bell pepper replicas and were required to judge whether they possessed the same shape or had different shapes. For some participants, the objects to be discriminated possessed the same size, while for others, the two objects had different sizes. It was found that variations in scale did significantly reduce the participants’ haptic sensitivities to shape. Nevertheless, the discrimination performance obtained for large variations in size was no lower than that obtained for smaller variations in size. The results also demonstrated that increases in age modestly affect haptic shape discrimination performance: the d′ values of the older participants were 15.5% lower than those of the younger participants. Nature Publishing Group UK 2020-09-07 /pmc/articles/PMC7477202/ /pubmed/32895441 http://dx.doi.org/10.1038/s41598-020-71894-y Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Norman, J. Farley
Dukes, Jessica M.
Palmore, Tori N.
Aging and haptic shape discrimination: the effects of variations in size
title Aging and haptic shape discrimination: the effects of variations in size
title_full Aging and haptic shape discrimination: the effects of variations in size
title_fullStr Aging and haptic shape discrimination: the effects of variations in size
title_full_unstemmed Aging and haptic shape discrimination: the effects of variations in size
title_short Aging and haptic shape discrimination: the effects of variations in size
title_sort aging and haptic shape discrimination: the effects of variations in size
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7477202/
https://www.ncbi.nlm.nih.gov/pubmed/32895441
http://dx.doi.org/10.1038/s41598-020-71894-y
work_keys_str_mv AT normanjfarley agingandhapticshapediscriminationtheeffectsofvariationsinsize
AT dukesjessicam agingandhapticshapediscriminationtheeffectsofvariationsinsize
AT palmoretorin agingandhapticshapediscriminationtheeffectsofvariationsinsize