scholarly journals Effect of Painful and Non-Painful Sensorimotor Manipulations on Subjective Body Midline

2013 ◽  
Vol 7 ◽  
Author(s):  
Jason Bouffard ◽  
Martin Gagné ◽  
Catherine Mercier
Keyword(s):  
Body Midline

Hand Movements Which Cross the Body Midline: Findings Relating Age Differences to Handedness

1976 ◽  
Vol 42 (2) ◽  
pp. 643-646 ◽  
Author(s):  
W. N. Schofield
Keyword(s):  
Experimental Study ◽  
Age Differences ◽  
Lateral Inhibition ◽  
Hand Preference ◽  
Spatial Development ◽  
The Body ◽  
The Other ◽  
Hand Movements ◽  
Body Midline ◽  
Inhibition Effect

Performance of 200 children (5 groups, 4 to 12 yr.) in an experimental study of spatial development was analyzed in terms of hand preference and differences in laterality of response. In accord with the literature a cross-lateral inhibition effect was confirmed but there were marked differences between hands. The supposed ‘body midline’ seemed to offer more resistance to one hand than to the other. Alternative explanations are suggested.

scholarly journals Spatial deficits in visuomotor control along the body midline in a patient with optic ataxia

2010 ◽  
Vol 7 (9) ◽  
pp. 298-298
Author(s):  
C. Broderick ◽  
D. Striemer ◽  
S. Sparling ◽  
K. Murtha ◽  
J. Corbett ◽  
...  
Keyword(s):  
Visuomotor Control ◽  
The Body ◽  
Body Midline ◽  
Optic Ataxia

Instructions, Illusory Self-Tilt and the Rod-and-Frame Test

1979 ◽  
Vol 31 (1) ◽  
pp. 155-165 ◽  
Author(s):  
Eric Sigman ◽  
Donald R. Goodenough ◽  
Michael Flannagan
Keyword(s):  
Opposite Direction ◽  
Test Performance ◽  
The Body ◽  
Body Midline ◽  
Adjustment Error ◽  
Gravitational Vertical ◽  
Rod And Frame Test ◽  
Rod And Frame

If an illusion of self-tilt is involved in rod-and-frame test performance, then instructions to adjust the rod to the body midline (egocentric instructions) should result in less rod adjustment error than the standard instructions for the rod-and-frame test to adjust the rod to the gravitational vertical. Two experiments were designed to examine this possibility. The results of the first experiment indicate that the tilted rod-and-frame display induces an illusion of self-tilt in the opposite direction. Significant differences between instructional conditions were found in the second experiment as expected. Other rod-and-frame studies are discussed in view of these findings.

scholarly journals The Effect of Bilateral Isometric Forces in Different Directions on Motor Cortical Function in Humans

2010 ◽  
Vol 104 (6) ◽  
pp. 2922-2931 ◽  
Author(s):  
Juliette A. Yedimenko ◽  
Monica A. Perez
Keyword(s):  
Primary Motor Cortex ◽  
Index Finger ◽  
Motor Evoked Potentials ◽  
Short Interval ◽  
The Body ◽  
Body Midline ◽  
Cortical Function ◽  
Intracortical Circuits ◽  
The Right ◽  
Isometric Forces

The activity in the primary motor cortex (M1) reflects the direction of movements, but little is known about physiological changes in the M1 during generation of bilateral isometric forces in different directions. Here, we used transcranial magnetic stimulation to examine motor evoked potentials (MEPs), short-interval intracortical inhibition (SICI), and interhemispheric inhibition (IHI) in the left first dorsal interosseous (FDI) during isometric index finger abduction while the right index finger remained at rest or performed isometric forces in different directions (abduction or adduction) and in different postures (prone and supine). Left FDI MEPs were suppressed during bilateral compared with unilateral forces, with a stronger suppression when the right index finger force was exerted in the adduction direction regardless of hand posture. IHI targeting the left FDI increased during bilateral compared with unilateral forces and this increase was stronger during right index finger adduction despite the posture of the right hand. SICI decreased to a similar extent during both bilateral forces in both hand postures. Thus generation of index finger isometric forces away from the body midline (adduction direction), regardless of the muscle engaged in the task, down-regulates corticospinal output in the contralateral active hand to a greater extent than forces exerted toward the body midline (abduction direction). Transcallosal inhibition, but not GABAergic intracortical circuits, was modulated by the direction of the force. These findings suggest that during generation of bimanual isometric forces the M1 is driven by “extrinsic” parameters related to the hand action.

scholarly journals Hand-Foot Coupling: An Advantage for Crossed Legs

Perception ◽  
2019 ◽  
Vol 48 (4) ◽  
pp. 356-359
Author(s):  
Alice M. Pearce ◽  
Joshua S. Harvey ◽  
Hannah E. Smithson ◽  
Rebekah C. White
Keyword(s):  
Postural Stability ◽  
Anticipatory Postural Adjustments ◽  
The Body ◽  
Body Midline ◽  
Contralateral Hemisphere ◽  
Coupling Effects ◽  
Full Account ◽  
The Right ◽  
Motor Actions ◽  
Motor Programme

It is difficult to perform distinct, simultaneous motor actions with the ipsilateral hand and foot; for example, clockwise circles with the right hand and counter-clockwise circles with the right foot. By chance, we discovered that this hand-foot coupling task is easier when seated with legs crossed. We consider various explanations. First, that there are reduced demands on the contralateral hemisphere when the motor programme of the right foot is executed on the left side of the body. Second, that the legs-crossed scenario is easier because movements are symmetrical with respect to body midline. By considering related motor actions, we conclude that neither of these explanations provides a full account. Thus, we suggest a third explanation, which is that coupling effects are reduced by virtue of increased postural stability and reduced anticipatory postural adjustments.

Development of deep-water redfish (Sebastes mentella) larvae, with comparative notes on newly extruded Acadian redfish (Sebastes fasciatus) from the Flemish Cap

1987 ◽  
Vol 65 (5) ◽  
pp. 1167-1180 ◽  
Author(s):  
Randy Penney
Keyword(s):  
Discriminant Function ◽  
Deep Water ◽  
Discriminant Function Analysis ◽  
Morphological Analysis ◽  
Function Analysis ◽  
Body Midline ◽  
Published Data ◽  
Body Proportions ◽  
Northwest Atlantic ◽  
Sebastes Mentella

Planktonic redfish larvae of the genus Sebastes were collected from Flemish Cap, an offshore Northwest Atlantic fishing bank east of the island of Newfoundland, Canada. A protocol based on discriminant function analysis and previously published age–length relationships was used to identify specimens of S. mentella and newly extruded (< 9 mm) S. fasciatus. On Flemish Cap, newly extruded larvae of S. mentella and S. fasciatus do not differ significantly in body proportions, fin morphology, or numbers of body myomeres but do differ significantly in pigmentation patterns on the head, nape, dorsal body midline, and numbers of subcaudal melanophores. A developmental series of S. mentella is described in terms of morphometry, meristics, occurrence of head spines, and pigmentation patterns and compared to previously published data on Sebastes spp. from other areas. The utility of various characters in relation to their use as identification criteria is discussed. The results of this morphological analysis support the contention that S. mentella and S. marinus larvae are more similar to each other than either of them is to S. fasciatus.

S–R Compatibilities Depend on Eccentricity of Responding Hand

1989 ◽  
Vol 41 (2) ◽  
pp. 263-272 ◽  
Author(s):  
Claire F. Michaels
Keyword(s):  
Reaction Times ◽  
The State ◽  
The Body ◽  
Body Midline ◽  
Hand Position ◽  
Finger Movement ◽  
Left Hand ◽  
Action System ◽  
Right Hand ◽  
The Right

Bauer and Miller (1982) demonstrated that when responding on the body midline with the right hand, subjects react faster when the pairing between horizontally oriented stimuli (an X to the left or right of fixation) and vertically oriented responses (an up or down finger movement) is left–down, right–up (“anti-clockwise”) but when responding with the left hand, the converse pairing was faster. The present experiments tested whether those preferences held for responses other than on the body midline. Unimanual reaction times for clockwise and anti-clockwise S–R pairings were determined for both hands at the midline and 30 and 60 cm to the left or right. Hand position determined both the direction and extent of the compatibility preference; at eccentric positions the right hand preferred clockwise pairings and the left anticlockwise, the converse of that found by Bauer and Miller. The results extend Bauer and Miller's finding, raise problems for theories of S–R compatibility, and further reveal that the state of the action system “sets up” perception.

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