A Posner-like paradigm was employed to investigate the effects of valid and invalid cueing of each hand on reaction time, movement time and peak velocity in an aiming task. Given claims of left hemisphere superiority in movement selection and inhibition (and the privileged within-hemisphere access of the right hand to such systems), it was hypothesised that invalidly cueing the left hand (i.e. ...

DESCRIPTION A 44-year-old man, right hand dominant, presented to the emergency department with a chief complaint of left hand pain status post crush injury to left hand between heavy metal objects at the workplace. The patient was found to have a left long finger distal tip amputation with concomitant transverse distal phalangeal fracture and intact sterile and germinal matrix.

N Engl J Med 2005;353:1021-7. Copyright © 2005 Massachusetts Medical Society. A 62-year-old man presents with an intermittent tremor in his left hand and some vague discomfort in the left arm. Physical examination shows a minimal rest tremor in the left hand that disappears with use of the limb, mild rigidity at the left wrist and elbow, slowness of finger tapping with the left hand, and decrea...

Asymmetrical hand use by rhesus monkeys (Macaca mulatta) was investigated in a series of tactually and visually guided tasks. The 1st experiment recorded manual preferences of 29 monkeys for solving a haptic discrimination task in a hanging posture. There was a left-hand population bias: 21 monkeys had a left-hand bias, 4 a right-hand bias, and 4 no bias. The 2nd experiment, 4 tasks with 23 to ...

Manipulation of objects and tool-use are known to be controlled by a network of frontal motor and parietal areas. Here, we investigate which of these areas are associated with the somatic sensation of hand-object interactive movement using functional magnetic resonance imaging. To dissociate the sensation of movement from the motor control commands, we used a new kinesthetic illusion. Twelve bl...

Recent research has shown that proprioception relies on distorted representations of body size and shape. By asking participants to localise multiple landmarks on their occluded hand, perceptual maps of hand size and shape can be constructed and compared to actual hand structure. These maps are different from the actual size and shape of the occluded hand, revealing underestimation of finger le...