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Author Sydney Y Schaefer

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Neural correlates of within-session practice effects in mild motor impairment after stroke: a preliminary investigation.

Elizabeth Regan, Julius Fridriksson, Sydney Y Schaefer, Chris Rorden, Leonardo Bonilha, Jennapher Lingo VanGilder, Jill Campbell Stewart,

While the structural integrity of the corticospinal tract (CST) has been shown to support motor performance after stroke, the neural correlates of within-session practice effects are not known. The purpose of this preliminary investigation was to examine the structural brain correlates of within-session practice effects on a functional motor task ... Read more >>

Exp Brain Res (Experimental brain research)
[2020, :]

Cited: 0 times

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Challenging the relationship of grip strength with cognitive status in older adults.

Andrew Hooyman, Michael Malek-Ahmadi, Elizabeth B Fauth, Sydney Y Schaefer,

OBJECTIVE:Grip strength is a widely used motor assessment in ageing research and has repeatedly been shown to be associated with cognition. It has been proposed that grip strength could enhance cognitive screening in experimental or clinical research, but this study uses multiple data-driven approaches to caution against this interpretation. Furthermore, ... Read more >>

Int J Geriatr Psychiatry (International journal of geriatric psychiatry)
[2020, :]

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Effect of Standing on a Standardized Measure of Upper Extremity Function.

Jill Campbell Stewart, Ashley Saba, Jessica F Baird, Melissa B Kolar, Michael O'Donnell, Sydney Y Schaefer,

Although many daily activities that require the upper extremity are performed in standing, arm motor function is generally measured in sitting. The purpose of this study was to examine the effect of standing on a measure of upper extremity function, the Jebsen Hand Function Test (JHFT). Twelve nondisabled adults (26.3 ... Read more >>

OTJR (Thorofare N J) (OTJR : occupation, participation and health)
[2020, :1539449220937058]

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Using a Timed Motor Task to Predict One-Year Functional Decline in Amnestic Mild Cognitive Impairment.

Sydney Y Schaefer, Andrew Hooyman, Kevin Duff,

Affordable, noninvasive methods of predicting functional decline are needed for individuals at risk for Alzheimer's disease. This study tested whether a timed upper-extremity motor task predicted functional decline over one year in 79 adults diagnosed with amnestic mild cognitive impairment. Participants completed subjective and objective measures of daily functioning at ... Read more >>

J Alzheimers Dis (Journal of Alzheimer's disease : JAD)
[2020, 77(1):53-58]

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Functional Connectivity of Heschl's Gyrus Associated With Age-Related Hearing Loss: A Resting-State fMRI Study.

Megan C Fitzhugh, Angela Hemesath, Sydney Y Schaefer, Leslie C Baxter, Corianne Rogalsky,

A large proportion of older adults experience hearing loss. Yet, the impact of hearing loss on the aging brain, particularly on large-scale brain networks that support cognition and language, is relatively unknown. We used resting-state functional magnetic resonance imaging (fMRI) to identify hearing loss-related changes in the functional connectivity of ... Read more >>

Front Psychol (Frontiers in psychology)
[2019, 10:2485]

Cited: 1 time

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Dopamine replacement improves motor learning of an upper extremity task in people with Parkinson disease.

Serene S Paul, Leland E Dibble, Genevieve N Olivier, Christopher Walter, Kevin Duff, Sydney Y Schaefer,

BACKGROUND:Dopamine replacement medication has positive effects on existing motor skills for people with Parkinson disease (PD), but may have detrimental effects on the learning of motor skills necessary for effective rehabilitation according to the dopamine overdose hypothesis. OBJECTIVES:This study aimed to determine whether dopamine replacement medication (i.e. levodopa) affects: learning ... Read more >>

Behav Brain Res (Behavioural brain research)
[2020, 377:112213]

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Exploring the relationship between visuospatial function and age-related deficits in motor skill transfer.

Jennapher Lingo VanGilder, Christopher S Walter, Caitlin R Hengge, Sydney Y Schaefer,

BACKGROUND:Generalizing learned information from one motor task to another is critical for effective motor rehabilitation. A recent study demonstrated age-related declines in motor skill transfer, yet findings from other motor learning studies suggest that visuospatial impairments may explain such aging effects. AIMS:The purpose of this secondary analysis was to test ... Read more >>

Aging Clin Exp Res (Aging clinical and experimental research)
[2020, 32(8):1451-1458]

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Cognitive function at admission predicts amount of gait speed change in geriatric physical rehabilitation.

Sydney Y Schaefer, Jacklyn M Sullivan, Daniel S Peterson, Elizabeth B Fauth,

Ann Phys Rehabil Med (Annals of physical and rehabilitation medicine)
[2020, 63(4):359-361]

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Quantifying Caregiver Movement when Measuring Infant Movement across a Full Day: A Case Report.

Judy Zhou, Sydney Y Schaefer, Beth A Smith,

There is interest in using wearable sensors to measure infant movement patterns and physical activity, however, this approach is confounded by caregiver motion. The purpose of this study is to estimate the extent that caregiver motion confounds wearable sensor data in full-day studies of infant leg movements. We used wearable ... Read more >>

Sensors (Basel) (Sensors (Basel, Switzerland))
[2019, 19(13):]

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Predicting Motor Sequence Learning in People With Parkinson Disease.

Geneviève N Olivier, Serene S Paul, Keith R Lohse, Christopher S Walter, Sydney Y Schaefer, Leland E Dibble,

BACKGROUND AND PURPOSE:Skill acquisition (ie, performance changes during practice) occurs in a nonlinear fashion. Despite this, motor learning is typically measured by comparing discrete timepoints. Thus, typical measures of motor learning do not detect skill acquisition characteristics that may be clinically meaningful. Reliable prediction of motor skill learning in people ... Read more >>

J Neurol Phys Ther (Journal of neurologic physical therapy : JNPT)
[2019, 43(1):33-41]

Cited: 1 time

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Dopamine Replacement Medication Does Not Influence Implicit Learning of a Stepping Task in People With Parkinson's Disease.

Serene S Paul, Sydney Y Schaefer, Genevieve N Olivier, Christopher S Walter, Keith R Lohse, Leland E Dibble,

INTRODUCTION:Treatment of Parkinson's disease (PD) with exogenous dopamine (ie, levodopa) may positively affect motor symptoms, but may negatively affect other functions such as the learning of motor skills necessary for rehabilitation. This study aimed to determine whether levodopa medication affects general and sequence-specific learning of a stepping task and the ... Read more >>

Neurorehabil Neural Repair (Neurorehabilitation and neural repair)
[2018, 32(12):1031-1042]

Cited: 0 times

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Declines in motor transfer following upper extremity task-specific training in older adults.

Christopher S Walter, Caitlin R Hengge, Bergen E Lindauer, Sydney Y Schaefer,

BACKGROUND:Age-related declines in function can limit older adults' independence with activities of daily living (ADLs). While task-specific training maybe a viable approach to improve function, limited clinical resources prevent extensive training on wide ranges of skills and contexts. Thus, training on one task for the benefit of another (i.e., transfer) ... Read more >>

Exp Gerontol (Experimental gerontology)
[2019, 116:14-19]

Cited: 1 time

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Within-Session Practice Effects in the Jebsen Hand Function Test (JHFT).

Sydney Y Schaefer, Ashley Saba, Jessica F Baird, Melissa B Kolar, Kevin Duff, Jill C Stewart,

The Jebsen Hand Function Test (JHFT) is a standardized assessment that has been used as a clinical outcome measure. To appropriately interpret the effects of an intervention on hand function (as measured by the JHFT), the extent to which this instrument shows significant practice effects must be quantified. The purpose ... Read more >>

Am J Occup Ther (The American journal of occupational therapy : official publication of the American Occupational Therapy Association)
[2018, 72(6):7206345010p1-7206345010p5]

Cited: 1 time

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Evidence for startle as a measurable behavioral indicator of motor learning.

Nathan J Kirkpatrick, Vengateswaran J Ravichandran, Eric J Perreault, Sydney Y Schaefer, Claire F Honeycutt,

The ability of the classic startle reflex to evoke voluntarily prepared movement involuntarily has captured the attention of neuroscientists for its wide-ranging functional utility and potential uses in patient populations. To date, there is only one documented task resistant to the startReact phenomenon-index finger abduction. Previous reports have suggested the ... Read more >>

PLoS One (PloS one)
[2018, 13(5):e0195689]

Cited: 2 times

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Concussion history is negatively associated with visual-motor force complexity: evidence for persistent effects on visual-motor integration.

Adam C Raikes, Sydney Y Schaefer, Breanna E Studenka,

OBJECTIVES:Long-term monitoring of concussion recovery requires time- and cost-effective methods. Physiologic complexity may be useful in evaluating visual-motor integration following concussion. The purpose of this study was to quantify the extent to which prior number of concussions influenced visual-motor tracking force complexity. METHODS:Thirty-five individuals with a self-reported concussion history (age: ... Read more >>

Brain Inj (Brain injury)
[2018, 32(6):747-754]

Cited: 0 times

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Visuospatial function predicts one-week motor skill retention in cognitively intact older adults.

Jennapher Lingo VanGilder, Caitlin R Hengge, Kevin Duff, Sydney Y Schaefer,

Motor learning declines with aging, such that older adults retain less motor skill after practice compared to younger adults. However, it remains unclear if these motor learning declines are related to normal cognitive changes associated with aging. The purpose of this study was to examine which cognitive domains would best ... Read more >>

Neurosci Lett (Neuroscience letters)
[2018, 664:139-143]

Cited: 1 time

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Sleep Quantity and Quality during Acute Concussion: A Pilot Study.

Adam C Raikes, Sydney Y Schaefer,

STUDY OBJECTIVES:A number of subjective and objective studies provide compelling evidence of chronic post-concussion changes in sleep, yet very little is known about the acute effects of concussion on sleep quality and quantity. Therefore, the purpose of this prospective pilot study was to use actigraphy to examine the changes in ... Read more >>

Sleep (Sleep)
[2016, 39(12):2141-2147]

Cited: 8 times

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Asking New Questions with Old Data: The Centralized Open-Access Rehabilitation Database for Stroke.

Keith R Lohse, Sydney Y Schaefer, Adam C Raikes, Lara A Boyd, Catherine E Lang,

BACKGROUND:This paper introduces a tool for streamlining data integration in rehabilitation science, the Centralized Open-Access Rehabilitation database for Stroke (SCOAR), which allows researchers to quickly visualize relationships among variables, efficiently share data, generate hypotheses, and enhance clinical trial design. METHODS:Bibliographic databases were searched according to inclusion criteria leaving 2,892 titles ... Read more >>

Front Neurol (Frontiers in neurology)
[2016, 7:153]

Cited: 3 times

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Within-session and one-week practice effects on a motor task in amnestic mild cognitive impairment.

Sydney Y Schaefer, Kevin Duff,

Practice effects on neuropsychological tests, which are improvements in test scores due to repeated exposure to testing materials, are robust in healthy elders, but muted in older adults with cognitive disorders. Conversely, few studies have investigated practice effects on motor tasks involving procedural memory, particularly across test-retest periods exceeding 24 hours. ... Read more >>

J Clin Exp Neuropsychol (Journal of clinical and experimental neuropsychology)
[2017, 39(5):473-484]

Cited: 4 times

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Associations Between Fine Motor Performance in Activities of Daily Living and Cognitive Ability in a Nondemented Sample of Older Adults: Implications for Geriatric Physical Rehabilitation.

Elizabeth B Fauth, Sydney Y Schaefer, Steven H Zarit, Marie Ernsth-Bravell, Boo Johansson,

OBJECTIVE:Fine motor ability (FMA) is essential in certain activities of daily living (ADL) and is considered mostly as a component of physical function. We hypothesize that cognitive ability explains significant variance in ADL-related FMA, above and beyond what is explained by physical ability (grip strength). METHOD:Origins of Variance in the ... Read more >>

J Aging Health (Journal of aging and health)
[2017, 29(7):1144-1159]

Cited: 3 times

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Short-term practice effects in mild cognitive impairment: Evaluating different methods of change.

Kevin Duff, Taylor J Atkinson, Kayla R Suhrie, Bonnie C Allred Dalley, Sydney Y Schaefer, Dustin B Hammers,

Practice effects are improvements on cognitive tests as a result of repeated exposure to testing material. However, variability exists in the literature about whether patients with amnestic mild cognitive impairment (MCI) display practice effects, which may be partially due to the methods used to calculate these changes on repeated tests. ... Read more >>

J Clin Exp Neuropsychol (Journal of clinical and experimental neuropsychology)
[2017, 39(4):396-407]

Cited: 8 times

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Lateralized motor control processes determine asymmetry of interlimb transfer.

Robert L Sainburg, Sydney Y Schaefer, Vivek Yadav,

This experiment tested the hypothesis that interlimb transfer of motor performance depends on recruitment of motor control processes that are specialized to the hemisphere contralateral to the arm that is initially trained. Right-handed participants performed a single-joint task, in which reaches were targeted to 4 different distances. While the speed ... Read more >>

Neuroscience (Neuroscience)
[2016, 334:26-38]

Cited: 3 times

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Phasic Electrodermal Activity During the Standardized Assessment of Concussion (SAC).

Adam C Raikes, Sydney Y Schaefer,

CONTEXT:The long-term effects of concussion on brain function during cognitive tasks are not fully understood and neuroimaging findings are equivocal. Some images show hyperactivation of prefrontal brain regions in previously concussed individuals relative to controls, suggesting increased cognitive resource allocation. Others show prefrontal hypoactivation and hyperactivation in other regions as ... Read more >>

J Athl Train (Journal of athletic training)
[2016, 51(7):533-539]

Cited: 0 times

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Rapid Responsiveness to Practice Predicts Longer-Term Retention of Upper Extremity Motor Skill in Non-Demented Older Adults.

Sydney Y Schaefer, Kevin Duff,

Skill acquisition is a form of motor learning that may provide key insights into the aging brain. Although previous work suggests that older adults learn novel motor tasks slower and to a lesser extent than younger adults, we have recently demonstrated no significant effect of chronological age on the rates ... Read more >>

Front Aging Neurosci (Frontiers in aging neuroscience)
[2015, 7:214]

Cited: 6 times

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Preserved motor asymmetry in late adulthood: is measuring chronological age enough?

Sydney Y Schaefer,

When comparing motor performance of the dominant and nondominant hands, older adults tend to be less asymmetric compared to young adults. This has suggested decreased motor lateralization and functional compensation within the aging brain. The current study further addressed this question by testing whether motor asymmetry was reduced in a ... Read more >>

Neuroscience (Neuroscience)
[2015, 294:51-59]

Cited: 8 times

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