Abstract：
:Subjects exposed to a rotating environment that perturbs their postural sway show adaptive changes in their voluntary spatially directed postural motion to restore accurate movement paths but do not exhibit any obvious learning during passive stance. We have found, however, that a variable known to characterize the degree of stochasticity in quiet stance can also reveal subtle learning phenomena in passive stance. We extended Chow and Collins (Phys Rev E 52(1):909-912, 1995) one-dimensional pinned-polymer model (PPM) to two dimensions (2-D) and then evaluated the model's ability to make analytical predictions for 2-D quiet stance. To test the model, we tracked center of mass and centers of foot pressures, and compared and contrasted stance sway for the anterior-posterior versus medio-lateral directions before, during, and after exposure to rotation at 10 rpm. Sway of the body during rotation generated Coriolis forces that acted perpendicular to the direction of sway. We found significant adaptive changes for three characteristic features of the mean square displacement (MSD) function: the exponent of the power law defined at short time scales, the proportionality constant of the power law, and the saturation plateau value defined at longer time scales. The exponent of the power law of MSD at a short time scale lies within the bounds predicted by the 2-D PPM. The change in MSD during exposure to rotation also had a power-law exponent in the range predicted by the theoretical model. We discuss the Coriolis force paradigm for studying postural and movement control and the applicability of the PPM model in 2-D for studying postural adaptation.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Bakshi A,DiZio P,Lackner JRdoi
10.1007/s00221-013-3815-7subject
Has Abstractpub_date
2014-04-01 00:00:00pages
1095-108issue
4eissn
0014-4819issn
1432-1106journal_volume
232pub_type
杂志文章abstract：:We examined opioid binding in fractions with disconnected nerve endings (secretosomes) which were prepared from porcine neurohypophyses by centrifugation in a discontinuous Percoll gradient. Specific (= displaceable) binding was observed with 3H-etorphine and with 3H-diprenorphine, two ligands with low selectivity for...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00271856
更新日期：1988-01-01 00:00:00
abstract：:Neuromagnetic fields from the left cerebral hemisphere of five healthy, right-handed subjects were investigated under three different experimental conditions: (1) electrical stimulation of the right index finger (task S); (2) voluntary movement of the same finger (M); (3) M+S condition, consisting of voluntary movemen...
journal_title：Experimental brain research
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1007/BF00230430
更新日期：1996-01-01 00:00:00
abstract：:Cultured olfactory bulb cells from embryonic mice had ultrastructural characteristics similar to those of many cell types in the intact adult mouse olfactory bulb. Identified cultured cells included mitral/tufted cells, granule cells, short-axon cells, and fibrous and protoplasmic astrocytes. Cultured neurons were fou...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF02738402
更新日期：1994-01-01 00:00:00
abstract：:Transient changes in extracellular potassium concentration ([K+]o) and field potentials were evoked by 4-aminopyridine (4-AP; 50-100 microM) and recorded with ion-selective microelectrodes in CA1b, CA3b and dentate sectors of adult rat hippocampal slices. Long-lasting field potentials recurred at a frequency of approx...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00228628
更新日期：1996-04-01 00:00:00
abstract：:The experiments were designed to test two hypotheses and their corollaries: 1. That adaptation of EMG responses to support surface rotations is due to a decrease in the gain of proprioceptively triggered long-loop stretch reflexes (Nashner 1976), and that the adaptation is dependent on a normally functioning vestibula...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00247031
更新日期：1987-01-01 00:00:00
abstract：:Upper trunk bending movements were accompanied by opposite movements of the lower body segments. These axial kinematic synergies maintained equilibrium during the movement performance by stabilizing the center of gravity (CG), which shifted on average across all the subjects by 1 +/- 4 cm in the anteroposterior direct...
journal_title：Experimental brain research
pub_type： 临床试验,杂志文章
doi：10.1007/s002210050274
更新日期：1998-01-01 00:00:00
abstract：:It is a conservative and reasonable suggestion that implicit functioning, as in blindsight, is simply a weakened, degraded form of normal functioning, especially as the parameters of vision in blindsight are themselves weakened--e.g., acuity is reduced, detection thresholds are raised, chromatic discrimination is coar...
journal_title：Experimental brain research
pub_type： 杂志文章,评审
doi：10.1007/s00221-008-1388-7
更新日期：2009-01-01 00:00:00
abstract：:Double-labeling combined with elution-restaining immunofluorescence techniques were used to analyze the extent of coexistence among the peptides cholecystokinin (CCK), peptide histidine-isoleucine (PHI)/vasoactive intestinal polypeptide (VIP), substance P and the catecholamine-synthesizing enzyme tyrosine hydroxylase ...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00250598
更新日期：1988-01-01 00:00:00
abstract：:To elucidate hemispheric asymmetry in the neurophysiologic mechanisms of global and local information processing, we investigate high-density event-related potentials (ERPs) during divided and selective attention tasks based on detection of hierarchical letters whose spatial frequency is controlled. Twelve healthy mal...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-007-0948-6
更新日期：2007-08-01 00:00:00
abstract：:The mesencephalic dopamine (DA) cell system was examined in mice homozygous and heterozygous for the weaver (wv) gene and in wild-type controls to estimate the extent of cell losses associated with the genetically determined central DA deficiency observed in weaver homozygotes. Animals of the three genotypes (+/+, wv/...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00248351
更新日期：1988-01-01 00:00:00
abstract：:The coordination between eye and head movements during a rapid orienting gaze shift has been investigated mainly when subjects made horizontal movements towards visual targets with the eyes starting at the centre of the orbit. Under these conditions, it is difficult to identify the signals driving the two motor system...
journal_title：Experimental brain research
pub_type： 临床试验,杂志文章
doi：10.1007/pl00005663
更新日期：1997-05-01 00:00:00
abstract：:The simultaneous presentation of a visual and an auditory stimulus can lead to a decrease in people's ability to perceive or respond to the auditory stimulus. In this study, we investigate the effect that threat has upon this phenomenon, known as the Colavita visual dominance effect. Participants performed two blocks ...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-008-1608-1
更新日期：2009-02-01 00:00:00
abstract：:Several non-physiological stimuli (i.e. pharmacological or electrical stimuli) have been shown to induce Fos expression in striatal neurons. In this work, striatal Fos (i.e. Fos-like) expression was studied after physiological stimulation, i.e. motor activity (treadmill running at 36 m/min for 20 min). In rats killed ...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/pl00005715
更新日期：1997-07-01 00:00:00
abstract：:The goal of this study was to determine the effect of changes in core body temperature on the resting discharge rate and sensitivity of vestibular-nerve afferents. Extracellular recordings were made from vestibular-nerve afferents innervating the semicircular canals in anesthetized C57BL/6 mice maintained at a core bo...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-009-2015-y
更新日期：2010-01-01 00:00:00
abstract：:Single cell activity was recorded from the putamen in rhesus monkeys (Macaca mulatta) performing limb movements made both with and without a preceding preparatory "set" concerning the impending direction of movement. The monkeys were trained to perform an elbow step-tracking task, each trial of which required the subj...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00247293
更新日期：1987-01-01 00:00:00
abstract：:Aerobic exercise can enhance neuroplasticity although presently the neural mechanisms underpinning these benefits remain unclear. One possible mechanism is through effects on primary motor cortex (M1) function via down-regulation of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA). The aim of the present...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-016-4767-5
更新日期：2016-12-01 00:00:00
abstract：:Postural control is an important factor for early motor development; however, compared with adults, little is known about how infants control their unperturbed upright posture. This lack of knowledge, particularly with respect to spatial and temporal characteristics of infants' unperturbed independent standing, repres...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-007-1236-1
更新日期：2008-03-01 00:00:00
abstract：:Cultured rat hippocampal neurons with short processes were investigated using the whole cell voltage clamp under conditions appropriate for isolating Na+ currents. After incubation of the neuron culture for a period of 15-30 min in 1 mM sodium valproate, several parameters of the Na+ current were changed. The peak Na+...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00228395
更新日期：1993-01-01 00:00:00
abstract：:We tested the hypothesis that geniculate X cells are the neural substrate of psychophysically identified pattern channels and that geniculate Y cells are the neural substrate of psychophysically identified flicker channels. The hypothesis was tested by measuring the relative sensitivity of isolated X and Y cells in th...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00240505
更新日期：1984-01-01 00:00:00
abstract：:Perhaps the most intriguing disorders of body representation are those that are not due to primary disease of brain tissue. Strange and sometimes painful phantom limb sensations can result from loss of afference to the brain; and Complex Regional Pain Syndrome (CRPS)-the subject of the current report-can follow limb t...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-009-2107-8
更新日期：2010-07-01 00:00:00
abstract：:The afternystagmus that occurs in the dark after gaze fixation during optokinetic stimulation is directed in the opposite direction relative to the previous optokinetic stimulus. The mechanism responsible for such afternystagmus after suppression of optokinetic nystagmus (ASOKN) is unclear. Several hypotheses have bee...
journal_title：Experimental brain research
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00221-014-3971-4
更新日期：2014-09-01 00:00:00
abstract：:Fast backward trunk movements are accompanied by hip, knee and ankle rotation which compensate for the backward shift of the center of gravity. The electromyographic pattern associated with the performance of these movements and the associated synergies consists of a fairly synchronous activation of the prime mover (e...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00248275
更新日期：1989-01-01 00:00:00
abstract：:In humans, studies of back muscle activity have mainly addressed the functioning of lumbar muscles during postural adjustments or rhythmic activity, including locomotor tasks. The present study investigated how back muscles are activated along the spine during rhythmical activities in order to gain insights into spina...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-007-1146-2
更新日期：2008-02-01 00:00:00
abstract：:Besides luminance change, the pupil responds to changes in spatial pattern, color content and target motion. Our experimental results show that transient pupillary constriction can also be elicited by dichoptically viewing a change in stereoscopic stimuli composed of dynamic random-dot stereograms from an initially fl...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-004-2161-1
更新日期：2005-01-01 00:00:00
abstract：:The purpose of this study was to investigate the time-course of corticospinal excitability during reaction time (RT), and compare the excitability when a precue provided information regarding both the direction and extent of the upcoming movement ('Full' condition), specified the direction of the upcoming movement onl...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-003-1772-2
更新日期：2004-05-01 00:00:00
abstract：:Understanding the physiological and psychological factors that contribute to healthy and pathological balance control in man has been made difficult by the confounding effects of the perturbations used to test balance reactions. The present study examined how postural responses were influenced by the acceleration-dece...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-005-0049-3
更新日期：2005-12-01 00:00:00
abstract：:Attention to sensory stimulation modulates behavioural responses and cortical activity. Attention to movement can also modulate motor responses. For example, directing attention away from cued movements can increase reaction times. This study used fMRI to determine where in the motor cortex attention to movement modul...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-001-0905-8
更新日期：2002-01-01 00:00:00
abstract：:Everyday life requires the ability to flexibly switch between tasks. Often, task switching is accompanied by concurrent cognitive activities that compete for limited attentional resources. This study aimed to characterize the effects of attentional load on task switching. In experiment 1, participants performed an int...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-013-3452-1
更新日期：2013-06-01 00:00:00
abstract：:We studied the effects of morphine injected either systemically or into the dorsal periaqueductal gray (DPAG) or nucleus accumbens (NA) using conventional and ethological analyses of behavior of rats submitted to the elevated plus-maze test with transparent walls. Intraperitoneal morphine (0.1 mg/kg and 0.3 mg/kg) inc...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002210050896
更新日期：1999-11-01 00:00:00
abstract：:While mechanisms of orienting attention in unilateral spatial neglect (USN) have frequently been studied in the visual domain, these mechanisms remain relatively unexplored in the auditory domain. Our first goal was to replicate Spence and Driver's (J Exp Psychol Hum 22:1005-1030, 1994) results with a virtual reality ...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-016-4691-8
更新日期：2016-10-01 00:00:00
