This article shows how uninformed but rational voters can respond intelligently to political advertising. The article models a situation where a candidate must rely on a pressure group for financing political advertising and making endorsements. The pressure group uses its power over the purse to influence the position chosen by the candidate. Nevertheless, when uninformed voters use a strategi...

Reaching out for object is often described as consisting of two components that are based on different visual information. Information about the object's position and orientation guides the hand to the object, while information about the object's shape and size determines how the fingers move relative to the thumb to grasp it. We propose an alternative description, which consists of determining...

BACKGROUND Analysis of arthrokinematics may have clinical use in the diagnosis of dynamic instability of the thumb and wrist. Recent technological advances allow noninvasive, high-resolution imaging of skeletal (thumb and carpal bones) structures during motion. QUESTIONS/PURPOSES The primary purpose of this study is to define the arthrokinematics, estimated joint contact patterns, and distrib...

this deformity is often reffered to as thumbclutched hand, but a better term is the congenital clasped thumb. the congenital clasped thumb is associated with several well-de-fined syndromes, although it may also present as an isolated abnormality. weckesser, reac, and heiple called it a syndrome and divided the syndrome in to four groups. in group i, the thumb is deficient in extention only. in...

Anecdotal evidence suggests that a thumb and index finger grip might facilitate recovery from the manifestation of spatial disorientation known as the giant hand phenomenon. Sixteen pilots volunteered as subjects in an experiment that compared the effectiveness of the thumb and index finger versus the whole hand technique to overcome a visually-induced analogue of the giant hand phenomenon. Thu...

The function of the cerebellum in motor control is a long-standing puzzle because cerebellar damage is associated with both timing and coordination deficits. Timing is the ability to produce consistent intervals between movements based on an internal representation of time. Coordination, in contrast, is a state-dependent control process in which motor commands to one effector depend on the pred...

In this study, removal of a transitional object (pillow) was applied as the sole intervention for one of two siblings who sucked their thumbs. The intervention was applied only to the older sibling, whereas data were collected on the thumb sucking of both participants. Results indicated that removal of the transitional object for the older sibling reduced thumb sucking in both siblings and incr...

OBJECTIVE The aim of this study was to determine if thumb motor performance metrics varied by movement orientation, direction, and device size during single-handed use of a mobile phone device. BACKGROUND With the increased use of mobile phones, understanding how design factors affect and improve performance can provide better design guidelines. METHOD A repeated measures laboratory experim...

To measure the motions of the trapeziometacarpal joint of the thumb quantitatively, a roentgenographic method was developed and tested using T-shaped metal markers, a special cassette-holder, and biplane roentgenograms. Two experiments were performed. In the first one, the metal markers were fixed to the trapezium and third metacarpal in ten cadaver specimens, and a fixed spatial relationship b...

The ability to direct forces between the thumb and fingers is important to secure objects in the hand. We compared the coordination of thumb musculature in key and opposition pinch postures between stable and unstable tasks. The unstable task (producing thumb-tip force wearing a beaded thimble) required well-directed forces; the stable task (producing thumb-tip force against a pinch meter) did ...