کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5737931 | 1614729 | 2017 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Drifting while stepping in place in old adults: Association of self-motion perception with reference frame reliance and ground optic flow sensitivity
ترجمه فارسی عنوان
رانندگی در حالی که در بزرگسالان سالمی انجام می شود: انجمن ادراک حرکت خود با پایداری مرجع و حساسیت جریان نور زمینی
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کلمات کلیدی
RBTRFTCOPRDTSIPSelf-motion perception - ادراک حرکت خودQuiet standing - ایستاده خاموشFOR - برایanalysis of variance - تحلیل واریانسANOVA - تحلیل واریانس Analysis of varianceRod and Frame Test - تست راد و قابOptic flow - جریان نوریAging - سالخوردگیGround surface - سطح زمینFrames of reference - فریم های مرجعCenter of pressure - مرکز فشارFrame of reference - چارچوب مرجع
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب (عمومی)
چکیده انگلیسی
Optic flow provides visual self-motion information and is shown to modulate gait and provoke postural reactions. We have previously reported an increased reliance on the visual, as opposed to the somatosensory-based egocentric, frame of reference (FoR) for spatial orientation with age. In this study, we evaluated FoR reliance for self-motion perception with respect to the ground surface. We examined how effects of ground optic flow direction on posture may be enhanced by an intermittent podal contact with the ground, and reliance on the visual FoR and aging. Young, middle-aged and old adults stood quietly (QS) or stepped in place (SIP) for 30Â s under static stimulation, approaching and receding optic flow on the ground and a control condition. We calculated center of pressure (COP) translation and optic flow sensitivity was defined as the ratio of COP translation velocity over absolute optic flow velocity: the visual self-motion quotient (VSQ). COP translation was more influenced by receding flow during QS and by approaching flow during SIP. In addition, old adults drifted forward while SIP without any imposed visual stimulation. Approaching flow limited this natural drift and receding flow enhanced it, as indicated by the VSQ. The VSQ appears to be a motor index of reliance on the visual FoR during SIP and is associated with greater reliance on the visual and reduced reliance on the egocentric FoR. Exploitation of the egocentric FoR for self-motion perception with respect to the ground surface is compromised by age and associated with greater sensitivity to optic flow.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience - Volume 347, 7 April 2017, Pages 134-147
Journal: Neuroscience - Volume 347, 7 April 2017, Pages 134-147
نویسندگان
Catherine P. Agathos, Delphine Bernardin, Konogan Baranton, Christine Assaiante, Brice Isableu,