Motion Coherence and Biological Motion Perception in Healthy Ageing

Hannah Clare Agnew, Louisa Miller, Karin Stefanie Pilz

Research output: Contribution to conferenceAbstract

Abstract

It has been shown that the detection and discrimination of motion from random-dot kinematograms deteriorates with age. In addition to such low-level motion perception tasks, also the processing of more higher level motion stimuli, such as biological motion, changes with age; more specifically, it has been suggested that older adults rely more on the global form than the local motion information when processing point-light walkers (Pilz et al., 2010, Vision Research). Here, we investigated how the processing of local motion and form information in biological motion stimuli is related to sensitivity to coherent motion in healthy ageing. In a first task, we asked younger (18-32 years) and older participants (>60 years) to indicate the facing direction of three different point-light actions; normal actions that contained local motion and global form information, scrambled actions that contained primarily local motion information, and random-position actions that contained primarily global form information. In accordance with previous results, we found a general age-effect in that older adults performed worse than younger adults in all conditions. However, younger adults performed worse for random-position than normal actions, whereas older adults showed the same level of performance. Both age-groups performed worse for scrambled actions. In a second task, participants had to discriminate left/right (horizontal), or up/down (vertical) motion using random-dot kinematograms. We determined motion coherence thresholds for each participant using the method of constant stimuli with stimulus coherences varying between 1% and 80%. We found that overall, motion coherence was higher for vertical than horizontal motion but there was no difference in performance between age-groups. In addition, coherence thresholds did not correlate with performance in the biological motion task.
Original languageEnglish
Publication statusPublished - 2015
EventPSYPAG 2015 Annual Postgraduate Student Conference - Glasgow, United Kingdom
Duration: 22 Jul 201524 Jul 2015

Conference

ConferencePSYPAG 2015 Annual Postgraduate Student Conference
CountryUnited Kingdom
CityGlasgow
Period22/07/1524/07/15

Fingerprint

Motion Perception
Young Adult
Age Groups
Walkers
Light

Cite this

Agnew, H. C., Miller, L., & Pilz, K. S. (2015). Motion Coherence and Biological Motion Perception in Healthy Ageing. Abstract from PSYPAG 2015 Annual Postgraduate Student Conference, Glasgow, United Kingdom.

Motion Coherence and Biological Motion Perception in Healthy Ageing. / Agnew, Hannah Clare; Miller, Louisa; Pilz, Karin Stefanie.

2015. Abstract from PSYPAG 2015 Annual Postgraduate Student Conference, Glasgow, United Kingdom.

Research output: Contribution to conferenceAbstract

Agnew, HC, Miller, L & Pilz, KS 2015, 'Motion Coherence and Biological Motion Perception in Healthy Ageing' PSYPAG 2015 Annual Postgraduate Student Conference, Glasgow, United Kingdom, 22/07/15 - 24/07/15, .
Agnew HC, Miller L, Pilz KS. Motion Coherence and Biological Motion Perception in Healthy Ageing. 2015. Abstract from PSYPAG 2015 Annual Postgraduate Student Conference, Glasgow, United Kingdom.
Agnew, Hannah Clare ; Miller, Louisa ; Pilz, Karin Stefanie. / Motion Coherence and Biological Motion Perception in Healthy Ageing. Abstract from PSYPAG 2015 Annual Postgraduate Student Conference, Glasgow, United Kingdom.
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AB - It has been shown that the detection and discrimination of motion from random-dot kinematograms deteriorates with age. In addition to such low-level motion perception tasks, also the processing of more higher level motion stimuli, such as biological motion, changes with age; more specifically, it has been suggested that older adults rely more on the global form than the local motion information when processing point-light walkers (Pilz et al., 2010, Vision Research). Here, we investigated how the processing of local motion and form information in biological motion stimuli is related to sensitivity to coherent motion in healthy ageing. In a first task, we asked younger (18-32 years) and older participants (>60 years) to indicate the facing direction of three different point-light actions; normal actions that contained local motion and global form information, scrambled actions that contained primarily local motion information, and random-position actions that contained primarily global form information. In accordance with previous results, we found a general age-effect in that older adults performed worse than younger adults in all conditions. However, younger adults performed worse for random-position than normal actions, whereas older adults showed the same level of performance. Both age-groups performed worse for scrambled actions. In a second task, participants had to discriminate left/right (horizontal), or up/down (vertical) motion using random-dot kinematograms. We determined motion coherence thresholds for each participant using the method of constant stimuli with stimulus coherences varying between 1% and 80%. We found that overall, motion coherence was higher for vertical than horizontal motion but there was no difference in performance between age-groups. In addition, coherence thresholds did not correlate with performance in the biological motion task.

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