Abstract：
:We explored changes in the cyclical two-finger force performance task caused by turning visual feedback off performed either by the index and middle fingers of the dominant hand or by two index fingers of two persons. Based on an earlier study, we expected drifts in finger force amplitude and midpoint without a drift in relative phase. The subjects performed two rhythmical tasks at 1 Hz while paced by an auditory metronome. One of the tasks required cyclical changes in total force magnitude without changes in the sharing of the force between the two fingers. The other task required cyclical changes in the force sharing without changing total force magnitude. Subjects were provided with visual feedback, which showed total force magnitude and force sharing via cursor motion along the vertical and horizontal axes, respectively. Further, visual feedback was turned off, first on the variable that was not required to change and then on both variables. Turning visual feedback off led to a mean force drift toward lower magnitudes while force amplitude increased. There was a consistent drift in the relative phase in the one-hand task with the index finger leading the middle finger. No consistent relative phase drift was seen in the two-person tasks. The shape of the force cycle changed without visual feedback reflected in the lower similarity to a perfect cosine shape and in the higher time spent at lower force magnitudes. The data confirm findings of earlier studies regarding force amplitude and midpoint changes, but falsify predictions of an earlier proposed model with respect to the relative phase changes. We discuss factors that could contribute to the observed relative phase drift in the one-hand tasks including the leader-follower pattern generalized for two-effector tasks performed by one person.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Hasanbarani F,Reschechtko S,Latash MLdoi
10.1007/s00221-018-5179-5subject
Has Abstractpub_date
2018-03-01 00:00:00pages
779-794issue
3eissn
0014-4819issn
1432-1106pii
10.1007/s00221-018-5179-5journal_volume
236pub_type
杂志文章abstract：:The fast-twitch flexor digitorum longus (FDL) muscle was partially denervated by a unilateral section of the L7 ventral root. After approximately 100 days the isometric, force-velocity and histochemical properties of single motor units from the partially denervated muscle were determined. The diameter of the nerve axo...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00236946
更新日期：1985-01-01 00:00:00
abstract：:The representation of the two eyes in striate cortex (V1) of Cebus monkeys was studied by electrophysiological single-unit recordings in normal animals and by morphometric analysis of the pattern of ocular dominance (OD) stripes, as revealed by cytochrome oxidase histochemistry in V1 flat-mounts of enucleated animals....
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF02259100
更新日期：1992-01-01 00:00:00
abstract：:Counts of callosal neurons retrogradely labeled by horseradish peroxidase (visualized using multiple substrates) were obtained in areas 17 and 18 of five kittens reared with their eyelids bilaterally sutured and of three kittens which had undergone bilateral enucleation on postnatal days 1--4. These counts were compar...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00239301
更新日期：1980-01-01 00:00:00
abstract：:The gap effect refers to the finding that saccadic latencies are typically reduced when a fixation point is removed prior to the appearance of a peripheral target. This reduction in saccadic reaction time (SacRT) is thought to be due to a general warning effect and an oculomotor specific fixation offset that occur whe...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002219900243
更新日期：2000-01-01 00:00:00
abstract：:In a choice reaction time (RT) paradigm, providing partial advance information (a precue) about the upcoming response has been shown to decrease RT, presumably due to preprogramming of the precued parameters. When advance information about a particular aspect of a movement is provided (precued), several different stra...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-011-2893-7
更新日期：2011-12-01 00:00:00
abstract：:The blocking effect of triethyldodecylammoniumbromide (TEA-C12), applied locally to the sciatic nerve, was studied in 28 adult BDF1 mice. Clinical parameters, electrophysiological recordings of muscle action potentials evoked by stimulation at the sciatic notch, and morphological aspects are presented. Our results sho...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00248862
更新日期：1989-01-01 00:00:00
abstract：:It is an unresolved question whether the posture of single fingers relative to each other is represented in the brain within an external frame of reference. In two experiments, we investigated postural influences on the processing of tactile stimuli at fingers and hands. Healthy subjects received two simultaneous tact...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-010-2396-y
更新日期：2010-09-01 00:00:00
abstract：:Developmental changes in the human brain coincide with and underlie changes in a wide range of motor and cognitive abilities. Neuroimaging studies have shown that musical training can result in structural and functional plasticity in the brains of musicians, and that this plasticity is greater for those who begin trai...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-006-0619-z
更新日期：2007-01-01 00:00:00
abstract：:Several recent studies have provided support for the view that tactile stimuli/events are remapped into an abstract spatial frame of reference beyond the initial somatotopic representation present in the primary somatosensory cortex. Here, we demonstrate for the first time that the extent to which this remapping of ta...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-008-1510-x
更新日期：2008-11-01 00:00:00
abstract：:Receptive field (RF) characteristics of cells in primary visual cortex of the mouse (C57B16 strain) were studied by single unit recording. We have studied the functional organization of area 17 along both the radial and tangential dimensions of the cortex. Eighty seven percent of the visual neurons could be classified...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00247312
更新日期：1988-01-01 00:00:00
abstract：:This study examines the process of learning to walk from a functional perspective. To move forward, one must generate and control propulsive forces. To achieve this, it is necessary to create and tune a distance between the centre of mass (CoM) and the centre of pressure (CoP) along the antero-posterior axis. We hypot...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-015-4378-6
更新日期：2015-10-01 00:00:00
abstract：:Pax genes are important modulators of CNS development. Pax7 and Pax6 polarise the neural tube and regionalise the brain. Pax7 is pivotal in specifying the superior colliculus/tectum, an important centre for integration of visuomotor responses and a target for Pax6+ retinal ganglion cell axons during retinocollicular m...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-006-0735-9
更新日期：2007-04-01 00:00:00
abstract：:Recently, it has been reported that grasping with the left hand is more vulnerable to visual size illusions than grasping with the right hand. The present study investigated whether this increased sensitivity of the left hand for visual context extends to reaching. Left- and right-handed participants reached for targe...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-010-2214-6
更新日期：2010-05-01 00:00:00
abstract：:As a consequence of the fragility of various neural structures, preterm infants born at a low gestation and/or birthweight are at an increased risk of developing motor abnormalities. The lack of a reliable means of assessing motor integrity prevents early therapeutic intervention. In this paper, we propose a new metho...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002219900227
更新日期：2000-04-01 00:00:00
abstract：:Saccadic latencies measured in response to a step-wise displacement of the target may be substantially reduced if a gap separates the offset of the initial fixation point and the onset of the peripheral target. According to Fischer and Ramsperger (1984) this paradigm provokes a bimodal latency distribution which consi...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00229892
更新日期：1992-01-01 00:00:00
abstract：:When searching for a target with eye movements, saccades are planned and initiated while the visual information is still being processed, so that subjects often make saccades away from the target and then have to make an additional return saccade. Presumably, the cost of the additional saccades is outweighed by the ad...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-009-2032-x
更新日期：2010-03-01 00:00:00
abstract：:Two superimposed gratings, which differ in orientation and move independently, combine into a coherently moving plaid if the component gratings are similar. The effect on the plaid motion percept of the addition of texture to each grating was investigated. The texture disambiguates the motion of each component grating...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00228400
更新日期：1993-01-01 00:00:00
abstract：:Inhibitory control plays an important role in goal-directed behavior. Although substantial inter-individual variability exists in the behavioral performance of response inhibition, the corresponding modulating neurochemical and neurophysiological mechanisms remain unclear. Thus, the present study aimed to explore the ...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-017-5101-6
更新日期：2017-12-01 00:00:00
abstract：:The effects of trans-1-amino-cyclopentyl-1,3-dicarboxylate (trans-ACPD) and of DL-2-amino-3-phosphonopropionic acid (AP3), i.e. selective agonist and antagonist of metabotropic quisqualate receptors respectively, on parallel fibre (PF)-mediated EPSPs of Purkinje cells (PCs) were studied in an in vitro slice preparatio...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00228964
更新日期：1991-01-01 00:00:00
abstract：:Previous studies reported that the activity of trigeminal motoneurons innervating masseter muscles is modulated by vestibular inputs. We performed the present study to provide an anatomical substrate for these physiological observations. The transynaptic retrograde tracer pseudorabies virus-Bartha was injected into mu...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-005-0275-8
更新日期：2006-05-01 00:00:00
abstract：:A preparation is described that permits the monitoring of activity from individual muscle afferent nerve fibres in an intact peripheral nerve in the forelimb of the cat. The nerve is a fine branch of the deep radial that supplies the indicis proprius muscle. When it is freed from nearby tissue over a length of 2-5 cm ...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF02454157
更新日期：1997-01-01 00:00:00
abstract：:The present study investigated age-related changes in the attentional demands associated with interlimb coordination involving upper and lower limbs performed at three different movement frequencies. Younger and older adults performed rhythmical, 180° out-of-phase flexion-extension movements of the knee and elbow with...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-013-3511-7
更新日期：2013-06-01 00:00:00
abstract：:Local anesthetic may cause neurotoxicity in developing neurons. In this study, we examined the molecular mechanisms of microRNA-210 (miR-210) in regulating bupivacaine-induced dorsal root ganglia (DRG) neurotoxicity in vitro. Young mouse (P30) DRG explants were cultured in vitro and treated with 5 mM bupivacaine to in...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-015-4513-4
更新日期：2016-04-01 00:00:00
abstract：:The presence of after-effects in adaptation tasks implies that an existing internal model has been updated. Previously, we showed that although observers adapted to a visuomotor perturbation, they did not show after-effects. In this experiment, we tested 2 further observer groups and an actor group. Observers were now...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-011-2996-1
更新日期：2012-04-01 00:00:00
abstract：:Two versions of the hypothesis that discrete movements are produced by shifts in the system's equilibrium point are considered. The first suggests that shifts are monotonic and end near the peak velocity of movement, and the second presumes that they are nonmonotonic ("N-shaped") and proceed until the end of movement....
journal_title：Experimental brain research
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1007/BF00241503
更新日期：1995-01-01 00:00:00
abstract：:The cerebral response evoked by stimulation of the bulbar pyramidal tract in wood rats, like that of laboratory rats, consisted of a small alpha wave, almost obscured by a very large, superimposed r wave. The alpha wave behaved like a purely antidromic response, whereas the r wave behaved like a postsynaptic response,...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00228700
更新日期：1993-01-01 00:00:00
abstract：:Parkinson's disease (PD) is a multifactorial disease with a complex etiology that results from genetic risk factors, environmental exposures and most likely a combination of both. Rodent models of parkinsonism aim to reproduce key pathogenic features of the syndrome including movement disorder induced by the progressi...
journal_title：Experimental brain research
pub_type： 杂志文章,评审
doi：10.1007/s00221-006-0461-3
更新日期：2006-08-01 00:00:00
abstract：:For a long time, a controversy has been proposed that whether the process of theory of mind is a result of domain-specific or domain-general changes (Wellman in The handbook of childhood cognitive development. Blackwell Publication, New Jersey, 2011). This event-related potential study explored the neural time course ...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-013-3661-7
更新日期：2013-11-01 00:00:00
abstract：:The human visual system is strikingly insensitive to speed changes attributed to the need to infer visual acceleration, observed during stationary fixation, indirectly by comparing velocities integrated over time. The objective of this study was to test if smooth pursuit eye movements improve the detection of speed ch...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-005-0216-6
更新日期：2006-04-01 00:00:00
abstract：:Human gait is a complex process in the central nervous system that results from the integrity of various mechanisms, including different cortical and subcortical structures. In the present study, we investigated cortical activity during lower limb movement using EEG. Assisted by a dynamic tilt table, all subjects perf...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-010-2223-5
更新日期：2010-05-01 00:00:00
