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PubMed1975

Variation in form of the pyramidal tract and its relationship to digital dexterity.

A morphometric analysis of the pyramidal tract's relation to digital dexterity was performed on data from 69 mammals. The results show that the variation in digital dexterity among mammals corresponds most closely to the variation in place of termination of pyramidal tract fibers within the spinal cord, corresponds less closely to the variation in the size of the tract itself and its constituent fibers, and does not correspond reliably with any other feature yet reported. Since the termination of pyramidal tract fibers on or very near spinal motor neurons is a prerequisite even for the peculiar kind of dexterity seen in some non-primates (e.g., raccoon, kinkajou), this one feature alone seems to be a critical factor.

Animals↗

PubMed2006

Body position affects manual dexterity.

To evaluate the relationship between posture and psychomotor efficiency, 20 anesthesia providers performed a test requiring manual dexterity and eye-hand coordination while seated, kneeling, and standing bent forward at the waist. Performance on the Grooved Pegboard Test improved 6%-10% (P < 0.005) when subjects were seated compared to kneeling and standing bent at the waist, positions that the subjects rated as more painful and less comfortable than sitting. Sitting improved manual dexterity more in subjects with poor scores than it did in subjects with good performance. This study demonstrates improved manual dexterity in subjects seated in a comfortable position.

Adult↗

PubMed2000

Manual dexterity and successful hearing aid use.

Fine dexterity of the hand might be expected to correlate with the successful use of a hearing aid. In this study, the manual dexterity of 30 individuals between 65 and 85 years using a hearing aid was tested by the Purdue pegboard test and the result was compared to the benefit obtained from the use of a hearing aid assessed by a questionnaire. Of the 30 individuals included in this study 16 were wearing a 'behind the ear' type of hearing aid and the rest had an 'in the ear' type of hearing aid. A comparison is made between the two types of heariing aids. The results demonstrate a correlation between manual dexterity and successful use of a hearing aid when all the 30 individuals were considered as a single group. However, no such correlation was found for 'in the ear' group when they were analysed separately.

Aged↗

PubMed2005

Visual and tactile guidance of dexterous manipulation tasks: an fMRI study.

Models of motor guidance that dynamically adjust to the availability and quality of sensory information are based on the observation that dexterous tasks are routinely performed using various combinations of visual and tactile inputs. However, a dynamic neural system that acquires and processes relevant visual and tactile information remains relatively uncharacterized in humans. In this study, whole-brain functional magnetic resonance images were acquired during a dexterous manipulation task, compression of the end caps of a slender spring prone to buckling, to investigate the neural systems associated with motor guidance under four visual and tactile guidance conditions: (1) eyes closed (no visual input), smooth end caps, (2) eyes dosed, rough end caps, (3) eyes open and watching hand, smooth end caps, and (4) eyes open and watching hand, rough end caps. Performance of the dexterous task remained constant in all conditions. Variations in the two levels of visual input resulted in modulation of activity in the middle and inferior occipital gyrii and inferior parietal lobule, and variation in the two levels of tactile input during the task resulted in modulation of activity in the precentral (primary motor) gyrus. Although significantly active in all conditions, cingulate gyrus, medial frontal gyrus, postcentral gyrus, and cerebellum activities were not modulated by levels of either visual or somatosensory input, and no interaction effects were observed. Together, these data indicate that a fine-tuned motor task guided by varying visual and tactile information engages a distributed and integrated neural complex consisting of control and executive functions and regions that process dynamic sensory information related to guidance functions.

Adult↗

PubMed1995

Effects of exercise on dexterity.

As musicians occasionally report that their dextral facility is improved by recent exercise, it was hypothesized that manual dexterity would be influenced by a task requiring exertion. Before and after exertion on the Harvard Step Test, the experimental group's (n = 25) manual dexterity was tested on a grooved peg board. The control group's (n = 40) manual dexterity was measured before and after an inactive period. In both groups learning was significantly faster with the nondominant hand than with the dominant hand. Reasons why the hypothesis was not fully supported are discussed and suggestions for research noted.

Adult↗

PubMed2004

Comparison of pressure pain threshold, grip strength,dexterity and touch pressure of dominant and non-dominant hands within and between right-and left-handed subjects.

This study was done to evaluate differences in pressure pain threshold, grip strength, manual dexterity and touch pressure threshold in the dominant and non-dominant hands of right- and left-handed subjects, and to compare findings within and between these groups. Thirty-nine right-handed and twenty-one left-handed subjects participated in the study. Pressure pain threshold was assessed using a dolorimeter, grip strength was assessed with a hand-grip dynamometer, manual dexterity was evaluated using the VALPAR Component Work Sample-4 system, and touch pressure threshold was determined using Semmes Weinstein monofilaments. Results for the dominant and non-dominant hands were compared within and between the groups. In the right-handed subjects, the dominant hand was significantly faster with the VALPAR Component Work Sample-4, showed significantly greater grip strength, and had a significantly higher pressure pain threshold than the non-dominant hand. The corresponding results for the two hands were similar in the left-handed subjects. The study revealed asymmetrical manual performance in grip strength, manual dexterity and pressure pain threshold in right-handed subjects, but no such asymmetries in left-handed subjects.

Adult↗

PubMed1990

A test of fine finger dexterity.

The lack of instruments available for the measurement of fine dexterity (i.e., speed of interdigital manipulation) implies a gap not only in the occupational therapist's ability to quantify and deal precisely with patients' problems in this area, but also in the knowledge base of occupational therapy itself. The Rosenbusch Test of Finger Dexterity (developed by Doris F. Rosenbusch, MA, OTR), a new instrument that measures the speed of interdigital manipulation of objects by each hand separately, was tested on 64 subjects with normal hand function and 10 subjects known to have disabilities affecting fine dexterity. The determination of significant differences by the subjects' sex, dominant and nondominant hands, and normal and dysfunctional hands was performed with t tests. The scores of the subjects with normal hand function versus those with disabled hand function were then compared on all variables. The findings demonstrate that this instrument is ready to be used experimentally and compares favorably with current commercial tests on both reliability and validity coefficients.

Adult↗

PubMed1991

Wrist extensor orthoses: dexterity and grip strength across four styles.

Orthoses that are used to stabilize, protect, and support the wrist during functional activities often interfere with normal movement and, therefore, with hand function. This study compared the manual dexterity and grip strength of 20 female subjects while using a free hand and while wearing each of four wrist extensor orthoses: a Futuro prefabricated wrist brace (No. 33), a volar thumbhole orthosis, a volar orthosis with a radial connector bar, and a dorsal orthosis with distal transverse arch support. Of these orthoses, the Futuro prefabricated wrist brace afforded the best overall dexterity, although it was significantly slower (p less than .05) than the other orthoses in a writing subtest. Of the custom-made orthoses, the volar style with radial connector bar afforded the best overall dexterity. All of the orthoses significantly (p less than .01) reduced grip strength. The Futuro prefabricated wrist brace afforded the strongest grip strength of the four orthoses studied, and the volar thumbhole orthosis permitted the strongest grip among the custom-made orthotic styles.

Adult↗

PubMedDate not supplied

Adult norms for a commercially available Nine Hole Peg Test for finger dexterity.

The Nine Hole Peg Test is commonly used by occupational therapists as a simple, quick assessment for finger dexterity. The purpose of this study was to evaluate the interrater and test-retest reliability of the commercially available Smith & Nephew Rehabilitation Division version of the Nine Hole Peg Test, and to establish new adult norms for the Nine Hole Peg Test for finger dexterity utilizing this particular version. Two of the researchers established interrater and test-retest reliability by evaluating 25 occupational therapy student volunteers. Seven hundred and three subjects, ranging in age from 21 to 71+ years, were tested to establish norms, using the standard protocol. Results showed high interrater reliability and only moderate test-retest reliability. Scores obtained by using the commercially available version were not statistically different from previously published norms (Mathiowetz, Weber, Kashman, & Volland, 1985). This study supports the original norms and further assists occupational therapists to evaluate dexterity accurately.

Adult↗

PubMed1989

[Manual dexterity and acquisition of correct dental hygiene].

The aim of this study was to evaluate the relationship of normal dexterity and the ability to obtain correct dental hygiene. Manual dexterity level was determined by means of psychotechnical tests on 35 students. Plaque index was noted before oral hygiene instructions including tooth-brushing and flossing techniques according to BASS. The same index was noted 15 days after instructions. Statistical analysis of results showed no significant relationship between manual dexterity and plaque control efficiency.

Dental Devices, Home Care↗

PubMed1979

Manual dexterity as a predictor of quality of care among dental practitioners.

This study explores the relationship between time to complete a manual dexterity exercise and quality of restorative dentistry. Ninety-seven general practitioners volunteered to take part in the study. An average of 14 patients per office were recalled and an average of five recent restorations per patient were examined clinically by trained peer reviewers. Subsequently, 74 of the 97 dentists participated in a session in which the O'Connor Tweezer Dexterity test was administered. Pearson correlations between speed on the test of tweezer dexterity and quality measures indicated that, on the average, those practitioners who took longer to complete the tweezer test achieved significantly higher scores on restorative quality.

Aptitude Tests↗

PubMed1979

Successful surgical correction of symptomatic cor triatriatum dexter.

An unusual case of cor triatriatum dexter is presented. Abnormal embryologic development of the eustachian valve caused nearly complete septation of the right atrium in a 67-year-old woman. Multiple supraventricular arrhythmias prompted clinical evaluation and diagnosis. Surgical excision of the anomalous membrane resulted in complete relief from arrhythmias and a clinical cure. Cor triatriatum dexter is rare and is infrequently diagnosed before postmortem study; however, once the diagnosis is extablished, the condition is amenable to a relatively simple surgical correction. Supraventricular tachycardia has not previously been reported to be associated with cor triatriatum dexter. We believe this is the first case in which such arrhythmias led to early diagnosis and successful surgical correction.

Aged↗

PubMed1977

Correlation between kinesthetic discrimination & manual dexterity.

Sixteen early-blinded adults and 16 normally sighted adults performed tests of manual dexterity and kinesthetic discrimination to determine whether or not a significant positive correlation exists between the two skills for each group. Manual dexterity was measured by the Minnesota Rate of Manipulation Test, Displacing and Turning tests. Kinesthetic discrimination was measured by the Kinesthesiometer Test and Kinesthesia Test of the Southern California Sensory Integration Tests. The Spearman Rank Order Correlation formula yielded a significant positive correlation (p less than .05) between manual dexterity and kinesthetic discrimination for the blind and sighted groups.

Adult↗

PubMed1997

The Effect of Protective Gloves on Manual Dexterity in the Cold Environments.

This article presents a study on the effect of different protective gloves (which are commercially available and commonly used in the cold) on manual dexterity in cold environments. The experiments compared statistically four different types of gloves and two different types of gloving (outer or double) at +19 °C and -10 °C. Performance was determined both objectively and subjectively using two manual dexterity tasks: bolt-nut and pick-up tasks. The response measured was the time of performing each task. Statistical analysis showed that all independent factors such as glove type, participant, object size, and temperature had significant effects on the hand cooling reaction. A significant difference in the performance between the gloves was found in the bolt-nut task. It was also found that outer-inner combination gloving may be an approach to use for precision tasks.

cold climate↗

PubMed2006

Evaluating surgical dexterity during corneal suturing.

OBJECTIVE: To evaluate motion tracking as an aid to a more objective assessment of ophthalmic microsurgical skill. METHODS: In a cohort study, 3 groups of differing levels of surgical experience were assessed. The groups included novice surgeons (n = 10) with fewer than 5 previously performed corneal sutures, trainee surgeons (n = 10) with 5 to 100 previously performed corneal sutures, and expert surgeons (n = 10) with more than 100 previously performed corneal sutures. The Imperial College Surgical Assessment Device was used for the objective assessment of surgical dexterity during corneal suturing. Each of the subjects used a 10-0 nylon suture in a 3-1-1 pattern on an artificial eye (Royal College of Ophthalmologists, London, England). The Imperial College Surgical Assessment Device measures 3-dimensional spatial vectors via electromagnetic sensors attached to the surgeon's fingers. The number of movements, path length for the respective movements, and time taken to complete the given task were recorded. RESULTS: Highly statistically significant differences were found between the 3 grades of surgeon experience for time taken (P<.001), number of hand movements (P<.001), and path length of the hand movements (P = .002) to complete the given task. CONCLUSIONS: Motion analysis measured by this technology may be useful in the formal surgical training of residents and as an objective quantitative measure of dexterity.

Clinical Competence↗

PubMed1991

Cor triatriatum dexter: recognition and percutaneous transluminal correction.

Cor triatriatum dexter is a rare congenital anomaly in which an obstructive membrane is located in the right atrium. The detection usually occurs after the sequelae of systemic congestion, coagulopathy, and hepatic dysfunction have set in, leading up to a high surgical risk. A percutaneous balloon correction of cor triatriatum dexter in a patient with advanced right-sided congestive symptoms and hepatic dysfunction is presented. This efficacious method is an alternative to surgical correction and could be extended to the more common cor triatriatum sinistra.

Adult↗

PubMed2006

Cuneate nucleus reorganization following cervical dorsal rhizotomy in the macaque monkey: its role in the recovery of manual dexterity.

Immediately following a dorsal rhizotomy that removes input from the thumb, index, and middle fingers, the macaque is unable to execute movements that require controlled apposition of these digits. We have previously shown that within the early weeks and months following one of these lesions, there is 1) a re-emergence of part or all of the cortical hand map; 2) central axonal sprouting of spared primary afferents into the dorsal horn and cuneate nucleus; and 3) substantial although incomplete recovery of hand function (Darian-Smith [204] J. Comp. Neurol. 470:134-150; Darian-Smith and Ciferri [2005] J. Comp. Neurol. 491:27-45). In this study we asked: What neuronal reorganization occurs in the cuneate nucleus during this "recovery" period? And, does it contribute to the recovery of manual dexterity? To address these questions, the representation of the hand was electrophysiologically mapped (by unitary receptive field [RF] recordings) in the pars rotunda of the cuneate nucleus at either 1-2 weeks (short term) or 16-32 weeks (long term) post-rhizotomy. In short-term monkeys, the region deprived of input from the thumb, index, and middle finger was found to be unresponsive to cutaneous stimulation. However, at 16-32 weeks later, when dexterity had largely recovered, RFs of cuneate neurons could again be mapped within the cuneate nucleus, primarily in a region bordering the deprived zone. We conclude that the cuneate pre- and postsynaptic reorganization that occurs following dorsal rhizotomy plays a key role in the recovery of hand function.

Afferent Pathways↗

PubMed1999

Neural control of dexterity: what has been achieved?

This chapter reviews progress made in our understanding of the neural control of dexterity. It stresses the increasing benefit derived by uniting the different disciplines concerned with the study of the hand. It highlights the study of natural movements and of the importance of tackling the function of the interface between the neural control system and the biomechanical apparatus of the hand and arm. It also highlights the distributed nature of the control system, its utilisation of complex spatio-temporal representations and its dependence on sensory input. It concludes by pointing out the lessons that have been learned from two fields of work: the development of motor skill and the comparative study of dexterity in different primate species

Animals↗