Movement time varies as a function of amplitude and requirements for precision, according to Fitts' law, but when subjects perform two-handed movements targets widely disparate difficulty they do so simultaneously. The hand moving an "easy" target moves more slowly accommodate its "difficult" counterpart, yet both hands reach peak velocity acceleration synchronously. This result suggests that the brain produces simultaneity action not by controlling each limb independently, organizing...

In a set of three experiments, we show that after an auditory "go" signal, subjects simultaneously initiate and terminate two-handed movements to targets widely disparate difficulty. This is the case when required are (a) lateral away from midline body (Experiment 1), (b) toward 2), (c) in forward direction 3). Kinematic data obtained high-speed cinematography (200 frames/sec) point tight coordinative coupling between two hands. Although hands move at entirely different speeds points space,...

Abstract Several converging lines of evidence suggest that the anterior cingulate cortex (ACC) is selectively involved in error detection or evaluation poor performance. Here we challenge this notion by presenting event-related potential (ERP) feedback-elicited error-related negativity, an ERP component attributed to ACC, can be elicited positive feedback when a person expecting negative and vice versa. These results performance monitoring ACC not limited processing. We propose acts as part...

In three experiments we show, using behavioural measures of movement outcome, as well trajectory information and resultant kinematic profiles, that there is a strong tendency for the limbs to be co-ordinated unitary structure even under conditions where movements are disparate difficulty. Environmental constraints (an obstacle placed in path one limb, but not other) shown modulate space-time behaviour both (Experiment II). Our results obtain symmetrical I) asymmetrical involve non-homologous...

This set of experiments is concerned with the specification movement parameters hypothesized to be involved in initiation movement. Experiment 1 incorporated precuing method developed by Rosenbaum which a precue provided partial information upcoming before stimulus move. Under conditions precues were letter symbols and stimuli color-coded dots mapped response keys. found reaction times slower for arm than direction, both extent. In 1, using that paralleled those employed Rosenbaum, we...

Four subjects performed rhythmic movements of the ankle and wrist in time with an auditory metronome, two modes coordination, antiphase in-phase. The forearm was placed either a prone or supine position. When were prepared mode, spontaneous transitions to in-phase phase wandering observed as metronome frequency increased. between occasionally observed. Predicted signature features nonequilbrium noted, including loss stability critical fluctuations. movement patterns determined by spatial...

Abstract Two experiments were conducted to determine if typical right hand target aiming advantages could be reduced or eliminated by increasing the spatial demands of task. In Experiment 1, we found for both movement time and error regardless characteristics When introduced a greater degree uncertainty in 2, subjects exhibited left reaction advantage. Taken together our results suggest that cerebral hemisphere may have special role play preparing aspects an movement, while is more important...

GOODMAN, D., M. GAETZ, and D. MEICHENBAUM. Concussions in hockey: there is cause for concern. Med. Sci. Sports Exerc., Vol. 33, No. 12, 2001, pp. 2004–2009. Purpose The purpose of the study was to document various aspects concussion Canadian Amateur hockey including demographics, causes, treatment, prevention order guide future recommendations on how reduce injury. Methods A detailed prospective retrospective history obtained from British Columbia Junior Hockey League players over course two...

An experiment was conducted to examine the contribution of sensory information asymmetries in manual aiming. Movements were performed four vision conditions. In full-vision condition (FV), subjects afforded both hand and target throughout course movement. ambient-illumination-off (AO), room lights extinguished at movement initiation, preventing moving limb. target-off (TO) condition, upon initiation a no-vision (NV) ambient illumination removed response Results indicated that accuracy...

The influence of information-based dynamics on coordination rhythmic movement was examined with special reference to the expression asymmetries. In Experiment 1, right-handed subjects performed unimanual, rhythmical movements in either a discrete or continuous visual display. right hand-visual display system defined more stable perception-action collective than left, particularly when information available. 2, same bimanual action inherently collective, although similar patterns were...

The purpose of this experiment was to investigate how the control aiming movements performed as fast and accurately possible changes with practice. We examined: (1) influence visual feedback on initial impulse error correction phases during acquisition; (2) effect removing at different levels Results from acquisition trials indicated that vision had a major impact organization phases. Also, consistent findings research involving temporally constrained movements, cost greater after extensive...

Objective: To determine if an athlete’s capacity to perform exercise is impaired following concussion and whether this would be reflected by altered heart rate response. Methods: Of the 14 concussed athletes, nine missed playing time as a direct result of their five did not. The athletes performed protocol on cycle ergometer within 72 hours being asymptomatic at rest second test 5 days previous assessment. Matched controls (n = 14) were tested using same line. consisted 2 minute warm up, 10...

A systematic approach to the analysis of sporting events is discussed. The basic tenet that objective quantification critical required for a complete analysis. This encompasses diverse areas methodology and research, such as quantification, biomechanics physiology. theoretical underpinning are behavioural, in so far athletes produce observable behaviour can be quantified ultimately changed. Several linked together general framework each one these dealt with detail.