Effects of visual interference on initial motor program errors and execution times in the choice step reaction

Uemura, Kazunori; Oya, Toshihisa; Uchiyama, Yasushi

doi:10.1016/j.gaitpost.2012.10.016

Cited by 35 publications

(26 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar postural adjustment errors have been observed previously during forward stepping when subjects were unsure about which limb to step with during choice reaction time step tasks (Patla et al 1993; Jacobs and Horak 2007; Cohen et al 2011). The error rates for the Younger-SB1 and Older-SB1 groups are consistent with error rates produced in younger adults during performance of forward stepping, where the direction of forward step was cued by directional arrows embedded in congruous and incongruous flankers (Uemura et al 2013a; Uemura et al 2013b). Specifically, the error rate when incongruous flankers were displayed was approximately 30% greater than the error rate when congruous flankers were shown.…”

Section: Discussionsupporting

confidence: 75%

“…As mentioned previously, increased error rates observed in the Older-SB2 group during the PID-INC conditions appear to have resulted from faster PA1 during these steps,(Uemura et al 2013b) and suggests impairment in inhibitory function (Cohen et al 2011). A negative outcome of this deficiency is that it delays the liftoff even more.…”

Section: Discussionsupporting

confidence: 56%

“…George et al 2007). In addition, several studies have detailed errors in the generation of initial postural responses when uncertainty about the appropriate postural response is created by presenting multiple stimulus-response options (Cohen et al 2011; Sparto et al 2013; Uemura et al 2013a; Uemura et al 2013b). However, the number of initial postural adjustment errors increase with age (Cohen et al 2011).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Postural adjustment errors during lateral step initiation in older and younger adults

et al. 2014

View full text Add to dashboard Cite

The purpose was to examine age differences and varying levels of step response inhibition on the performance of a voluntary lateral step initiation task. Seventy older adults (70 – 94 y) and twenty younger adults (21 – 58 y) performed visually-cued step initiation conditions based on direction and spatial location of arrows, ranging from a simple choice reaction time task to a perceptual inhibition task that included incongruous cues about which direction to step (e.g. a left pointing arrow appearing on the right side of a monitor). Evidence of postural adjustment errors and step latencies were recorded from vertical ground reaction forces exerted by the stepping leg. Compared with younger adults, older adults demonstrated greater variability in step behavior, generated more postural adjustment errors during conditions requiring inhibition, and had greater step initiation latencies that increased more than younger adults as the inhibition requirements of the condition became greater. Step task performance was related to clinical balance test performance more than executive function task performance.

show abstract

Section: Discussionsupporting

confidence: 75%

Section: Discussionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Postural adjustment errors during lateral step initiation in older and younger adults

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The following events were extracted from the vertical force data: (1) APA onset: when the difference in vertical force under both feet first increased by 5% of the body weight; (2) APA errors: trials in which the participants executed an APA in the incorrect direction, subsequently corrected that APA, and stepped with the correct foot; (3) foot off: the first moment when the vertical force under either foot decreased to zero, and (4) foot contact: the first moment when the vertical force under the swing leg exceeded 10 N. BW = Body weight. This figure has been previously published [17]. …”

Section: Methodsmentioning

confidence: 99%

“…We found that the selective attention task with incongruous visual stimuli increased the reaction time and number of initial weight transfer direction errors during choice stepping. Initial weight transfer errors were shown to prolong anticipatory postural adjustments (APAs) and step execution in healthy young adults [17]. Visual interference from incongruous stimuli might burden the inhibitory process during choice step reactions and expose potential deficits in motor and/or cognitive function, allowing its use as a falling risk screening tool.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Choice Stepping with Visual Interference Can Detect Prolonged Postural Preparation in Older Adults with Mild Cognitive Impairment at High Risk of Falling

Uemura

Hasegawa

Tougou

et al. 2015

Dement Geriatr Cogn Disord

Self Cite

View full text Add to dashboard Cite

Background/Aims: We aimed to clarify postural control deficits in older adults with mild cognitive impairment (MCI) at high risk of falling by addressing the inhibitory process. Methods: This study involved 376 community-dwelling older adults with MCI. Participants were instructed to execute forward stepping on the side indicated by the central arrow while ignoring the 2 flanking arrows on each side (→→→→→, congruent, or →→←→→, incongruent). Initial weight transfer direction errors [anticipatory postural adjustment (APA) errors], step execution times, and divided phases (reaction, APA, and swing phases) were measured from vertical force data. Participants were categorized as fallers (n = 37) and non-fallers (n = 339) based on fall experiences in the last 12 months. Results: There were no differences in the step execution times, swing phases, step error rates, and APA error rates between groups, but fallers had a significantly longer APA phase relative to non-fallers in trials of the incongruent condition with APA errors (p = 0.005). Fallers also had a longer reaction phase in trials with the correct APA, regardless of the condition (p = 0.01). Conclusion: Analyses of choice stepping with visual interference can detect prolonged postural preparation as a specific falling-associated deficit in older adults with MCI.

show abstract

Erratum to: Postural adjustment errors during lateral step initiation in older and younger adults

et al. 2015

View full text Add to dashboard Cite

show abstract

Effects of visual interference on initial motor program errors and execution times in the choice step reaction

Cited by 35 publications

References 22 publications

Postural adjustment errors during lateral step initiation in older and younger adults

Postural adjustment errors during lateral step initiation in older and younger adults

Analysis of Choice Stepping with Visual Interference Can Detect Prolonged Postural Preparation in Older Adults with Mild Cognitive Impairment at High Risk of Falling

Erratum to: Postural adjustment errors during lateral step initiation in older and younger adults

Contact Info

Product

Resources

About