Movement related EMGs become more variable during learning of fast accurate movements.

abstract：:Two experiments are reported in which expert and novice gymnasts were required to walk across a balance beam as quickly as possible in various vision conditions. In Experiment 1, experts walked faster than novices in all vision conditions, showing the greatest superiority when vision was completely eliminated. Novices...

journal_title：Journal of motor behavior

authors： Robertson S,Collins J,Elliott D,Starkes J

更新日期：1994-12-01 00:00:00

abstract：:Following Asatryan and Fei'dman (1965), two experiments were conducted to describe the so-called invariant mechanical properties underlying movement control in Down's syndrome and normal subjects. The invariant characteristic is a curve on a graph of joint torque versus joint angle. The task required subjects to maint...

journal_title：Journal of motor behavior

authors： Davis WE,Kelso JA

更新日期：1982-09-01 00:00:00

abstract：:Two separate experiment using motor responses evaluated the specificity vs. generality of response consistency when the various tasks used the same limb for response. In Exp. I four similar tasks requiring rapid right arm movement were defined and, in Exp. II, Ss had to "hit" a moving target with either a maximal or m...

journal_title：Journal of motor behavior

authors： Schmidt RA

更新日期：1969-06-01 00:00:00

abstract：:Motor disorders may occur in mild cognitive impairment (MCI) and at early stages of Alzheimer's disease (AD), particularly under divided attention conditions. We examined functional mobility in 104 older adults (42 with MCI, 26 with mild AD, and 36 cognitively healthy) using the Timed Up and Go test (TUG) under 4 expe...

journal_title：Journal of motor behavior

authors： Borges Sde M,Radanovic M,Forlenza OV

更新日期：2015-01-01 00:00:00

abstract：:As students progress to higher and higher levels in the acquisition of a skill their number gets smaller and smaller. This article concerns the average length of time it takes the members of these successively smaller groups to complete earlier stages of skill acquisition. In the data presented, which concern Red Cros...

journal_title：Journal of motor behavior

authors： Jones MB

更新日期：1980-03-01 00:00:00

abstract：:The speed at which sit-to-stand (STS) motions are performed and the subsequent terminal constraint upon upright stance can present subjects with contradictory goals. Previous findings suggested that subjects might adopt a strategy of limiting the peak horizontal momentum of the center of mass (CM), and perhaps of body...

journal_title：Journal of motor behavior

authors： Pai YC,Lee WA

更新日期：1994-09-01 00:00:00

abstract：:The study of sign languages provides a promising vehicle for investigating language production because the movements of the articulators in sign are directly observable. Movement of the hands and arms is an essential element not only in the lexical structure of American Sign Language (ASL), but most strikingly, in the...

journal_title：Journal of motor behavior

authors： Poizner H,Newkirk D,Bellugi U

更新日期：1983-03-01 00:00:00

abstract：:The authors investigated the self-selected, overground walking patterns of 7 children (aged 11 months to 1 year, 5 months) at the initiation of walking (brand-new walkers [BNWs]) and for the next 6 months at 1-month intervals. Walking speed, stride length, and stride frequency increased significantly between the first...

journal_title：Journal of motor behavior

authors： Holt KG,Saltzman E,Ho CL,Kubo M,Ulrich BD

更新日期：2006-05-01 00:00:00

abstract：:Visual guidance and movement to a stop were used to train subjects to make a simple movement without experiencing error in practice. Movement to a stop led to test performance as accurate as that after training with KR, but visual guidance did not. If a continuous visual cue as well as a stop were present during pract...

journal_title：Journal of motor behavior

authors： Smyth MM

更新日期：1978-09-01 00:00:00

abstract：:40 college males were sequentially assigned to 1 of 2 groups to examine the effects of induced physical fatigue upon the performance and learning of a gross motor task, the stabilometer. All Ss were given 32 practice trials over 3 practice sessions, with 48 hr. rest interpolated between sessions. Trials 1 and 2 were p...

journal_title：Journal of motor behavior

authors： Carron AV,Ferchuk AD

更新日期：1971-03-01 00:00:00

abstract：:Practice of complex tasks can be scheduled in several ways: as whole-task practice or as practice of the individual skills composing the task in either a blocked or a random order. The authors used those 3 schedules to study 18 participants' learning of an orthopedic surgical task. They assessed learning by obtaining ...

journal_title：Journal of motor behavior

authors： Brydges R,Carnahan H,Backstein D,Dubrowski A

更新日期：2007-01-01 00:00:00

abstract：:The purpose of this study was to investigate potential qualitative differences in relative timing across age both within and across speed conditions. Forty right-handed males performed 48 trials of a five-component coincident-timing task at one speed and then 16 more at a different speed. The independent variables wer...

journal_title：Journal of motor behavior

authors： Burton AW

更新日期：1986-09-01 00:00:00

abstract：:The purpose of this study was to compare the electroencephalographic (EEG) patterns and reaction times (RTs) of muscle activation between concentric and eccentric biceps brachii contractions under the RT paradigm and to evaluate how the EEG patterns and RTs changed with practice. Sixteen subjects performed 3 sets of 3...

journal_title：Journal of motor behavior

authors： Park JH,Cynn HS,Cha KS,Kim KH,Jeon HS

更新日期：2018-07-01 00:00:00

abstract：:The authors investigated how and to what extent visual information and associated task constraints are negotiated in the coordinative structure of playground swinging. Participants (N = 20) were invited to pump a swing from rest to a prescribed maximal amplitude under 4 conditions: normal vision, no vision, and 2 visu...

journal_title：Journal of motor behavior

authors： Post AA,Peper CE,Beek PJ

更新日期：2003-03-01 00:00:00

abstract：:The question addressed in the present study was whether subjects (N = 24) can use visual information about their hand, in the first half of an aiming movement, to ensure optimal directional accuracy of their aiming movements. Four groups of subjects practiced an aiming task in either a complete vision condition, a no-...

journal_title：Journal of motor behavior

authors： Temprado JJ,Vieilledent S,Proteau L

更新日期：1996-09-01 00:00:00

abstract：:Bimanual coordination is an essential human function requiring efficient interhemispheric communication to produce coordinated movements. Previous research suggests a "bimanual advantage" phenomenon, where completing synchronized bimanual tasks results in less variability than unimanual tasks. Additionally, of hand do...

journal_title：Journal of motor behavior

authors： Oswald K,Bo J

更新日期：2019-01-01 00:00:00

abstract：:To examine the coordination of muscles during multijoint movement, we compared the response of wrist muscles to perturbations about the elbow joint with their activation during a volitional elbow movement. The purpose was to test the following two predictions: (a) Responses can occur in muscles not stretched by the pe...

journal_title：Journal of motor behavior

authors： Koshland GF,Hasan Z,Gerilovsky L

更新日期：1991-06-01 00:00:00

abstract：:How are appropriate combinations of forelimb muscles selected during reach-to-grasp movements in the presence of neuromotor redundancy and important task-related constraints? The authors tested whether grasp type or target location preferentially influence the selection and synergistic coupling between forelimb muscle...

journal_title：Journal of motor behavior

authors： Geed S,van Kan PLE

更新日期：2017-05-01 00:00:00

abstract：:The biomechanical (kinetic) analysis of human gait reveals the integrated and detailed motor patterns that are essential in pinpointing the abnormal patterns in pathological gait. In a similar manner, these motor patterns (moments, powers, and EMGs) can be used to identify synergies and to validate theories of CNS con...

journal_title：Journal of motor behavior

authors： Winter DA

更新日期：1989-12-01 00:00:00

abstract：:Accurate timing of limb displacement is crucial for effective motor control. The authors examined the effects of movement velocity, duration, direction, added mass, and auditory cueing on timing, spatial, and trajectory variability of single- and multijoint rhythmic movements. During single-joint movements, increased ...

journal_title：Journal of motor behavior

authors： Shafir T,Brown SH

更新日期：2010-01-01 00:00:00

abstract：:ABSTRACT The authors investigated the ability of human participants to discover novel actions under conditions of delayed reinforcement. Participants used a joystick to search for a target indicated by visual or auditory reinforcement. Reinforcement delays of 75-150 ms were found to significantly impair action acquisi...

journal_title：Journal of motor behavior

authors： Walton T,Thirkettle M,Redgrave P,Gurney KN,Stafford T

更新日期：2013-01-01 00:00:00

abstract：:Three experiments are reported which investigate the role of mental imagery in the bilateral transfer from right to Ie ft hand of rotary pursuit skill. In Experiment 1 both mental imagery and physical rehearsal showed significant positive transfer relative to a control condition. However, work decrement may have accum...

journal_title：Journal of motor behavior

authors： Kohl RM,Roenker DL

更新日期：1980-09-01 00:00:00

abstract：:Knee rehabilitation exercises to improve motor control, target movement fluency, and displacement variability. Although knee movement in the frontal plane during exercise is routinely assessed in clinical practice, optimal knee control remains poorly understood. In this study, 29 healthy participants (height: 1.73 ± 0...

journal_title：Journal of motor behavior

authors： van Deursen RWM,Button K,Roos PE

更新日期：2017-11-01 00:00:00

abstract：:Social, psychological, and physiological studies have provided evidence indicating that laughter imposes an increased demand on trunk muscles. It was the aim of this study to quantify the activation of trunk muscles during laughter yoga in comparison with crunch and back lifting exercises regarding the mean trunk musc...

journal_title：Journal of motor behavior

authors： Wagner H,Rehmes U,Kohle D,Puta C

更新日期：2014-01-01 00:00:00

abstract：:Lee and Hirota (1980) claimed to provide evidence for the encoding specificity principle for movement information. I argue that their interpretations are confounded by methodological and theoretical factors. I further suggest that their findings are compatible with generation-recognition models of memory retrieval and...

journal_title：Journal of motor behavior

authors： Crocker PR

更新日期：1982-03-01 00:00:00

abstract：:Healthy untrained men (N = 11) were asked to perform 10 series of 12 repetitions of knee eccentric extension (EE) at 160 degrees per second. Quadriceps muscle torques evoked by electrical stimulation at 20 Hz (P20) and 100 Hz (P100), maximal voluntary isometric contraction torque (MVC), maximal isokinetic concentric t...

journal_title：Journal of motor behavior

authors： Skurvydas A,Brazaitis M,Kamandulis S,Sipaviciene S

更新日期：2010-05-01 00:00:00

abstract：:Falls are the leading cause of injury related death in older adults. In this piece, a motor learning lens is applied to falls, and falls are viewed as three interdependent phases: 1) destabilization, 2) descent, and 3) impact. This review examines how movements can be performed in the descent and impact phases to pote...

journal_title：Journal of motor behavior

authors： Hsieh KL,Sosnoff JJ

更新日期：2020-09-04 00:00:00

abstract：:How beginning jugglers discover the temporal constraints governing the juggling workspace while learning to juggle three balls in a cascade pattern was the subject of this investigation. On the basis of previous theoretical and experimental work on expert jugglers, we proposed a three-stage model of the learning proce...

journal_title：Journal of motor behavior

authors： Beek PJ,van Santvoord AA

更新日期：1992-03-01 00:00:00

abstract：:The authors studied the effects of surface friction at the digit-object interface on digit forces and moments when 12 participants statically held an object in a 5-digit grasp. The authors changed low-friction contact (LFC) with rayon and high-friction contact (HFC) with sandpaper independently for each digit in all 3...

journal_title：Journal of motor behavior

authors： Aoki T,Latash ML,Zatsiorsky VM

更新日期：2007-07-01 00:00:00

abstract：:Thirty male subjects, 20 of whom were self-classified left-handers and 10 right-handers, were tested on a grip-strength task and a handwriting task with each hand, both under normal conditions and in a situation of induced experimental fatigue. On the basis of questionnaire scores, the left-handers were sub-divided in...

journal_title：Journal of motor behavior

authors： Provins KA,Magliaro J

更新日期：1989-06-01 00:00:00