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Visual Control of Human Gait during ...

Popescu, Adrian.

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Visual Control of Human Gait during Locomotor Pointing.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Visual Control of Human Gait during Locomotor Pointing./
Author:	Popescu, Adrian.
Description:	218 p.
Notes:	Source: Dissertation Abstracts International, Volume: 74-07(E), Section: B.
Contained By:	Dissertation Abstracts International74-07B(E).
Subject:	Health Sciences, Recreation. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR92630
ISBN:	9780494926307

Visual Control of Human Gait during Locomotor Pointing.
Popescu, Adrian.

Visual Control of Human Gait during Locomotor Pointing. - 218 p.

Source: Dissertation Abstracts International, Volume: 74-07(E), Section: B.

Thesis (Ph.D.)--University of Alberta (Canada), 2013.

Daily locomotor tasks require gait adaptations in order to match various environmental challenges. Healthy individuals rely on vision in order to make proactive gait changes as vision is the sensory modality best suited to provide accurate information about distant environmental constraints. This dissertation was concerned with investigating the adaptive locomotor strategies and the related visual sampling characteristics during locomotor pointing tasks. These goals were achieved by conducting a series of four experiments requiring participants to walk towards and accurately point with the forefoot at distantly located targets without stopping. Young and older healthy participants performed the task in different environmental setups and under various visual sampling conditions.

ISBN: 9780494926307Subjects--Topical Terms:

1018003
Health Sciences, Recreation.

Visual Control of Human Gait during Locomotor Pointing.
LDR:03335nam a2200301 4500 001 1964146
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020 $a 9780494926307
035 $a (MiAaPQ)AAINR92630
035 $a AAINR92630
040 $a MiAaPQ $c MiAaPQ
100 1 $a Popescu, Adrian. $3 2100543
245 1 0 $a Visual Control of Human Gait during Locomotor Pointing.
300 $a 218 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-07(E), Section: B.
500 $a Adviser: Brian Maraj.
502 $a Thesis (Ph.D.)--University of Alberta (Canada), 2013.
520 $a Daily locomotor tasks require gait adaptations in order to match various environmental challenges. Healthy individuals rely on vision in order to make proactive gait changes as vision is the sensory modality best suited to provide accurate information about distant environmental constraints. This dissertation was concerned with investigating the adaptive locomotor strategies and the related visual sampling characteristics during locomotor pointing tasks. These goals were achieved by conducting a series of four experiments requiring participants to walk towards and accurately point with the forefoot at distantly located targets without stopping. Young and older healthy participants performed the task in different environmental setups and under various visual sampling conditions.
520 $a The results clearly demonstrate that the environmental information was sampled in a predictive manner for planning proactive stepping adjustments during the target approach and for extracting limb position information in relation with the target for fine-tuning the foot trajectory prior to foot-pointing. The results also indicate that discrete visual samples were adequate to complete the tasks. Generally, vision availability amounted to less than half of the trial duration for each trial and the typical sampling strategy consisted of one or two brief visual samples such that vision was available almost all the time during the pointing step. The gaze was deployed towards targets well in advance of the foot-pointing action and it remained anchored there until about the time the foot contacted that particular target.
520 $a Participants typically undershot the targets and the likelihood of overshooting the targets significantly changed with the increase in task difficulty and complexity. Older adults prematurely disengaged the gaze from the targets, consequently increasing the likelihood of target overshooting. This may indicate that the older adults need more time to plan and implement gait modulations and could be interpreted as a sign of future, naturally-occurring, and more dramatic changes in visuomotor control during adaptive locomotion.
520 $a In conclusion, this work shows the existence of well-preserved yet flexible motor control strategies related to locomotor pointing tasks. With aging, these visuomotor strategies lose their effectiveness and become one of the causes liable for the increase in the rate of falling occurrences for older adults.
590 $a School code: 0351.
650 4 $a Health Sciences, Recreation. $3 1018003
690 $a 0575
710 2 $a University of Alberta (Canada). $b Physical Education and Recreation. $3 2100544
773 0 $t Dissertation Abstracts International $g 74-07B(E).
790 $a 0351
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR92630