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In this paper we show how to construct the Evans function for traveling wave solutions of integral neural field equations when the firing rate function is a Heaviside. This allows a discussion of wave stability and bifurcation as a function of system parameters, including the speed and strength of synaptic coupling and the speed of axonal signals. The(More)
OBJECTIVE This study determined the variability and regularity of force production in impaired upper extremities of chronic stroke survivors. Two hypotheses included: (1) stroke will increase the variability and regularity of force output in comparison to age-matched controls and (2) degree of motor impairments will be positively correlated with the(More)
When humans perform movements and receive on-line visual feedback about their performance, the spatial qualities of the visual information alter performance. The spatial qualities of visual information can be altered via the manipulation of visual gain and changes in visual gain lead to changes in force error. The current study used functional magnetic(More)
In the present study, we examined whether preparing motor responses under different emotional conditions alters motor evoked potentials (MEPs) elicited by transcranial magnetic stimulation delivered to the motor cortex. Analyses revealed three findings: (1) Reaction times were expedited during exposure to unpleasant images, as compared with pleasant and(More)
A dynamical theory of spike train transitions in networks of pulse-coupled integrate-and-fire (IF) neural oscillators is presented. We begin by deriving conditions for 1:1 frequency locking in a network with non-instantaneous synaptic interactions. This leads to a set of phase equations determining the relative firing times of the oscillators and the(More)
OBJECTIVE This study determined the nature of bimanual deficits during visually-guided isometric force production in chronic stroke. METHODS Stroke survivors and age-matched controls performed bimanual isometric wrist/finger extension contractions for 20s to target submaximal force levels. Force asymmetry was indexed by the proportion of force contributed(More)
A central topic in sensorimotor neuroscience is the static-dynamic dichotomy that exists throughout the nervous system. Previous work examining motor unit synchronization reports that the activation strategy and timing of motor units differ for static and dynamic tasks. However, it remains unclear whether segregated or overlapping(More)