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PubMed2004

Eye-hand preference in schizophrenia: sex differences and significance for hand function.

Hand preference and eye dominance were investigated in 73 (30 women, 43 men) schizophrenic patients and 71 (30 women, 41 men) healthy controls. There were significantly more schizophrenic patients and normal controls who were significantly right-hand dominant. However, schizophrenic patients showed a significant excess of left-eye dominance relative to controls (65.8% vs 29.6%; Odds Ratio= 4.75, p< .001). In addition, female schizophrenic patients showed a higher rate of nonright (either left or inconsistent) eye dominance (80%) than male schizophrenic patients (55.8%) and controls (33.3%). Analysis of hand performance on the Purdue Pegboard Test indicated that schizophrenic patients who showed crossed eye-hand dominance scored higher than did patients without crossed eye-hand dominance.

Adult↗
PubMed1999

[Four "alien" hands for two hands after a lesion in corpus callosum].

Callosal lesions, associated or not to internal frontal lesions, may produce different types of complex gestural behaviors. Four signs can be identified, each of which has been generally reported separately: the "alien hand" sign, the "diagnostic apraxia", the "wayward hand" and the "callosal apraxia". Some authors justify considering these signs as different entities, while others propose regrouping them either in an unique syndrome--the "alien hand"--or as two syndromes--the "frontal alien hand" and the "callosal alien hand". We present the observation of a patient who presented with the four mentioned syndromes in association. In this context, we review the clinical features of each of the four signs and the arguments supporting their individualization.

Agnosia↗
PubMed2004

[The prognostic value of the Hand Injury Severity Score in industrial hand injuries].

BACKGROUND: We evaluated the value of the "Hand Injury Severity Score" (HISS) in determining the prognosis of industrial hand injuries. METHODS: Hand injury severity scores of 112 patients (17 females, 95 males; mean age 31 years; range 15 to 54 years) were calculated following surgery for industrial hand injuries. During the course of rehabilitation program, the patients were followed-up regularly. Pearson correlation coefficients were used to determine the relationship between the HISS scores and the time intervals from injury to healing and return to work. RESULTS: The mean HISS score was 37.1+/-27 (range 6 to 116). The time to healing ranged from 12 to 210 days (mean 73.7+/-40.7 days). All the patients returned to work after a mean of 80.4+/-52.9 days (range 7 to 300 days), mainly to previous working places with (12%) or without (79%) changing job activities. Nine per cent of the workers had to change their jobs. The HISS scores were found to be correlated with the healing period and the time to work (p<0.05 and p<0.000, respectively). CONCLUSION: The results of this study indicated that HISS was a useful system in predicting the prognosis in the early stages of industrial hand injuries.

Accidents, Occupational↗
PubMed1990

[Skin surface lipids and sweat of hand in girl students who complained of impaired skin on the hand by using household detergents].

A questionnaire was presented to female university students concerning the relationship between the use of household detergent and the occurrence of impaired hands. In addition, in order to determine whether there was any relationship between the amounts and qualities of skin surface film and the incidence of impairments of hands, the following experiment was undertaken. From among the 1,861 female university students, 28 girls between the ages of 21-22 were chosen; 14 of whom had complained of impaired skin of hands (impairment group) attributable to household detergent during the past one year and 14 who had not experienced such disorders, either of the hands or elsewhere (non-impairment group) during the same period. The method of collecting skin surface lipids and sweat simultaneously is for the subjects to wear special gloves made of a given cotton fabric by the modified method of Straus & Pochi for a fixed of time. Then, the skin surface lipids and sweat were analyzed to determine the differences between the impairment group and the non-impairment group. The following results were obtained: 1) Of the 1,861 people surveyed, 496 or 26.7% of them stated that they had suffered from impaired skin due to the use of household detergents during the past one year. The most frequent site was the hands, including wrists, and the main symptom was dry skin. There were some seasonal changes in the occurrence of the impaired skin, with the highest occurrence in winter. There was a significant difference between the occurrence in winter, and that in spring, summer and autumn (p less than 0.01). 2) During the hot season, (average temperature 23-29 degrees C), the arithmetic averages and their standard deviation of the skin surface lipids of both the impairment group (N = 14) and the non-impairment group (N = 14) were 29.10 +/- 7.89 micrograms/cm2/8 hr and 45.98 +/- 23.29 micrograms/cm2/8 hr, respectively. In the cold season, (average temperature 5-13 degrees C), these become 31.95 +/- 16.69 micrograms/cm2/8 hr, and 53.45 +/- 24.16 micrograms/cm2/ 8 hr, respectively. In both these seasons, it was found that the amount of skin surface lipids of the impairment group was significantly less (hot season p less than 0.05, cold season p less than 0.01) than that of the non-impairment group.(ABSTRACT TRUNCATED AT 400 WORDS)

Adult↗
PubMed1997

[Hand arthropathy of professional origin: milkingman hand].

OBJECTIVE: The aim of this case-control study was to know possible correlates between distinctive pattern of hand arthrosis and length manual milking. PATIENTS AND METHODS: Between January 1990 and January 1996, we retrospectively reviewed the patients with symptomatic arthrosis in whose hands was identified this pattern: degenerative disease of distal interphalangeal joints with radial deviation and flexion of distal phalanges in association to arthrosis involving metacarpophalangeal and interphalangeal joints of the thumb. The first 88 cases of hand arthrosis without this clinical and radiographic pattern make the control group. Patients suffering inflammatory rheumatic diseases were excluded. RESULTS: 35 patients with this special pattern of hand arthrosis were recruited. The majority of patients were women (94.3%) and coming from rural environment (94.3%). 32 patients had performed daily manual milking over a period of 20 years, but in three patients the pattern was not related to this activity (odds ratio = 928: p < 0.001). Symptoms were more frequent in the control-group (57% versus 26%; p < 0.04), in which no characteristic pattern of alignment abnormality was found. CONCLUSION: A typical pattern of hand arthrosis was associated with prolonged manual milking: degenerative disease of metacarpophalangeal and interphalangeal joints of thumb, radial deviation associated with flexion of distal phalanges of second at fourth fingers and arthrosis involving their distal interphalangeal joints, often linked to sight ulnar deviation of middle phalanges.

Aged↗
PubMed2005

Hand-assisted laparoscopic sigmoid colectomy: helping hand or hindrance?

BACKGROUND: Hand-assisted laparoscopic colectomy has been introduced as an alternative to the standard laparoscopic technique, but it has not yet been established whether it offers the same benefits. Therefore, we compared the outcome of patients undergoing hand-assisted laparoscopic sigmoid resection (HALSR) to that of those undergoing laparoscopic sigmoid resection (LSR). METHODS: The study population comprised a sequential series of consecutive patients undergoing elective laparoscopic sigmoid/left colectomy. Values are reported as mean (range). RESULTS: There were 85 LSR patients and 66 HALSR patients, with no differences in patient demographics or diagnoses. There were slight differences in operative time favoring HALSR (LSR 205 min (90-380) vs HALSR 189 min (120-290); p = 0.07), and the extraction incision was larger in the HALSR group (LSR 6.2 cm (3-25) vs HALSR 8.1 cm (7-12); p < 0.01). There was no difference in time for return of bowel function (LSR 2.8 days (1-15) vs HALSR 2.5 days (1-8); p = 0.31) or length of hospital stay (LSR 5.0 days (2-17) vs HALSR 5.2 days (3-22); p = 0.73). Complications were similar in the two groups (LSR 23% vs HALSR 21%), but there were fewer conversions in the hand-assisted group (HALSR 0% vs LSR 13%; p < 0.01). CONCLUSIONS: Hand-assisted laparoscopic sigmoid resection yields the same outcomes as standard laparoscopic techniques, but with fewer conversions. Hand-assistance is a helpful innovation that may expand the application of laparoscopic colectomy.

Adult↗
PubMed1992

Distributions of hand preference and hand skill asymmetry in preschool children: theoretical implications.

We describe the distributions of hand skill asymmetry for the Peg-moving task and the Graphic test among 765 preschool children. A single normal component was observed for the Peg-moving task, but two normal components for the Graphic test, which corresponded primarily to the right- and left-handed children. Hand Preference and Graphic test hand skill asymmetry were age-dependent, but there was no age effect on the PMT hand skill asymmetry. Results are discussed in relation to the Annett's Right Shift theory.

Child↗
PubMed1983

Variations in hand position, cerebral lateralization, and reading ability among right-handed children.

A group of 121 right-handed children between the ages of 7 and 9 with a range of hand positions between normal and inverted were assessed for verbal and visuospatial lateralization and reading comprehension. Results indicate that (a) children with a normal hand position tended to be more verbally lateralized than children with nonnormal positions, although the effect was not strong or always consistent, (b) the closer the child was to the normal position, the higher the child's reading scores, and (c) poor readers were as lateralized for verbal and visuospatial functions as were good readers. Coupled with the results of previous research, these findings suggest that hand position indexes both maturation and lateralization, and that the relationship between hand position and reading is primarily mediated by the former.

Age Factors↗
PubMed1990

Selective activation effects of concurrent verbal and spatial memory loads in left-handed and right-handed adults.

Thirty-two left-handed subjects, divided into four groups according to sex and familial sinistrality, and 16 right-handed subjects without familial sinistrality (8 male, 8 female) participated in a tachistoscopic unilateral letter-identification task with concurrent verbal- and spatial-memory loads. Across groups, a significant right visual field advantage for letter-identification was found. In the majority of both left-handed and right-handed subjects, the concurrent verbal-memory load resulted in a selective activation, with the right visual field performance showing improvement. However, the group of left-handed males with a positive family history of sinistrality gave less evidence of selective left-hemispheric activation as a consequence of the verbal-memory load. The concurrent spatial-memory load did not result in a consistent pattern of selective activation.

Adolescent↗
PubMed2004

Left-handed versus right-handed computer mouse use: effect on upper-extremity posture.

Alternatives to reduce postural constraints have to be sought in order to reduce musculoskeletal complaints related to computer work. This study aimed at documenting the impact of using the mouse on the left side of a standard keyboard (with a right numeric keypad) on upper-extremity posture. A simulated computer task was performed by 27 subjects in a laboratory before and 1 month after ergonomics training. Shoulder flexion and abduction, as well as wrist extension were reduced with left-handed mouse use. Sixteen of the 27 subjects truly converted to using the mouse with the left hand. After a month of using the mouse with the left hand, the time required to perform the same task reduced, the perceived difficulty and discomfort improved, though the time to perform the task was still longer than when using the mouse with the right hand. For work involving both keyboard and mouse use, and without the need of the numeric keypad, it would probably be preferable to use a keyboard without the numeric keypad if the mouse is to be used on the right-hand side. If such keyboards are unavailable, an interesting alternative would be to use the mouse on the left side provided sufficient time is allowed to get accustomed to it.

Adult↗
PubMed2005

Schizotypy is increased in mixed-handers, especially right-handed writers who use the left hand for primary actions.

Associations between schizotypy and handedness were examined in 733 undergraduates for the Sta and Unex scales of the O-LIFE inventory and several measures derived from the Annett hand preference questionnaire. Higher schizotypy scores were found for mixed-handers defined in various ways, including inconsistent preference for any item of the questionnaire and also the presence of either hand responses. There was a marked elevation of schizotypy scores (p<.001) for right-handed writers who prefer the left hand for other 'primary' actions (throwing, racket, match, hammer, toothbrush and scissors). This observation was replicated in 182 students assessed on the Rust Scale of Schizotypal Cognitions. Several findings agree that inconsistent hand preference is associated with a raised probability of schizotypal thinking.

Adolescent↗
PubMed2005

Chimpanzees are right-handed when recording bouts of hand use.

Whether nonhuman primates exhibit population-level handedness remains a topic of considerable debate. Previous research has shown that chimpanzees are right-handed when frequencies of hand use are recorded but some have questioned the validity of this approach. In this study, we evaluated handedness in 180 captive chimpanzees for a task measuring bimanual actions. Bouts rather than frequency of hand use were recorded in each subject. Population-level right-handedness was found using both continuous and nominal scales of measurement. Neither sex nor rearing history had a significant effect on hand use. These results indicate that chimpanzees are right-handed, even when using a more conservative measure of handedness. Limitations in the use of bouts in handedness assessment are also discussed.

Animal Population Groups↗
PubMed1993

Hand preferences and hand ability in congenitally blind children.

Congenitally blind and sighted blindfolded children between the ages of 6 and 14 years were tested for hand preference with performance tasks. There were no differences between the groups in direction or degree of hand preference. The degree of handedness increased with age and was essentially linear though the blind seemed to be somewhat less lateralized at the younger ages. When the same groups were required to match three-dimensional bricks for height, depth, breadth, and volume, no hand advantages were found for either group. Both groups of children improved in their accuracy of spatial discriminations with age. Further, the degree of lateralization on the handedness task did not relate to ability on the tactile task or to differences between the right and left hands on the tactile task. Thus, there is no effect of blindness on tactile matching ability nor is there an effect of the hand used in the task.

Adolescent↗
PubMed1993

Evidence for longevity differences between left handed and right handed men: an archival study of cricketers.

STUDY OBJECTIVE: The aim was to examine the relationship between handedness and longevity. DESIGN: This was an archival (retrospective) survey of a cohort of adult men who had played 'first-class cricket'. SETTING: The United Kingdom PARTICIPANTS: The subjects consisted of all of the deceased players included in an encyclopedia of 'first-class cricket' whose bowling hand had been recorded (n = 3165). The study also considered a further 2314 players, born before 1951 but still alive at the time the book was published (1984). MEASUREMENTS AND MAIN RESULTS: Using the bowling hand as an indicator of handedness it was possible to compare the lifespans of 2580 right handed men and 585 left handed men. The average life spans of the two groups differed by 25 months (right = 65.62, left = 63.52), a highly significant difference (p = 0.006). An examination of cause of death (where noted) strongly indicated that the left handed men were more likely to die prematurely in accidents or in warfare. As a consequence, when these unnatural deaths were removed from the sample the longevity difference between the right handers and left handers was considerably reduced. There was no evidence that these results related to any longitudinal change in the proportion of right handers to left handers across the time course of the sample. CONCLUSION: The study found clear evidence that left handedness was associated with a decrease in longevity among a cohort of adult, athletic men. A major factor responsible for this result seemed to be a differential likelihood of accidental death or death during warfare.

Aged↗
PubMed1997

Verbal-to-manual and manual-to-verbal dual-task interference in left-handed and right-handed adults.

Verbal-manual interference was investigated with 80 students who were divided into four groups by sex and hand preference. Unilateral finger-tapping was measured during no-load conditions and during two concurrent tasks of word reading (aloud) and sentence reading (silent). During concurrent tasks, no selective interference effects for the preferred hand were found; however, when participants were classified according to consistent handedness instead of hand preference, consistent right-handers exhibited selective right-hand tapping interference during concurrent word reading, whereas consistent left-handers showed generalized interference. During concurrent sentence reading, men showed selective right-hand interference, irrespective of handedness. The influence of tapping on word reading was also examined. Concurrent tapping lowered word-reading performance substantially, showing that finger-tapping and word reading interfered reciprocally.

Adolescent↗
PubMed1992

Relationship of serum zinc levels to hand preference, skull length and serum gonadal hormone levels in right-handed young adults.

The association between serum zinc (Zn) level and the degree of hand preference was studied in right-handed young adults. Hand preference was scored by the Waterloo Handedness Questionnaire. Serum Zn level was determined by the flow injection analysis-atomic absorption technique. Zinc was found to be positively linearly and significantly correlated with the degree of right hand preference in the sample of males with familial sinistrality (FS+) and FS- females with right eye and right foot preference. There was a negative linear correlation between these variables in FS+ females. Skull length showed a significant negative linear correlation with zinc in FS+ males and females, but a positive linear correlation in FS- females. In FS- females, there was a significant positive linear correlation between serum gonadal hormone binding globulin (GBG) and serum Zn levels. In FS+ males, there was a significant negative linear correlation between serum GBG and Zn levels, and a significant positive linear correlation between serum free testosterone level and serum Zn level. It was suggested that zinc may influence the degree of the right hand preference by hormonal mechanisms according to genetically established brain organization.

Adolescent↗
PubMed1993

Inverse relationship between the size of pattern reversal visual evoked potentials from the left brain and the degree of left-hand preference in left-handed normal subjects: importance of the left brain.

The relation of the degree of left-hand preference to pattern reversal visual evoked potentials (VEPs) from right and left brain was studied in male left-handers. The degree of the left-hand preference was assessed by the Waterloo Handedness Questionnaire. Visual stimuli consisted of black and white checkerboard patterns generated on a TV screen. VEPs were simultaneously recorded from occipital leads of the right and left hemispheres. The degree of left-hand preference was found to be inversely and significantly related to size of VEPs only from left brain, not from right brain. That is, the conduction time, amplitude, duration, and area of N1-P1 waves linearly decreased as the degree of left-hand preference increased. These results were in accord with the testosterone hypothesis of cerebral lateralization, but not compatible with the right shift theory of handedness. It was concluded that visuomotor control by the left brain would be the main biological correlate of left-hand preference with regard to sensorimotor and cognitive functions.

Adolescent↗
PubMed1999

Impairment of hand function and loss of earning capacity after occupational hand injury: prospective cohort study.

OBJECTIVE: To examine the loss of earning capacity and permanent impairment of a cohort of male patients who had experienced finger amputation due to occupational injury. DESIGN: Prospective cohort study. SETTING: University teaching hospital, Hong Kong. PATIENTS: Twenty-eight male patients aged 26 to 55 years who presented with work-related finger amputations in their dominant right hand from 1990 through 1991. MAIN OUTCOME MEASURES: Type and extent of amputation, and hand function before and after (mean, 11 months; range, 8-6 months) the patients' return to work. Assessment results were compared with patients' percentage loss of earning capacity as calculated using the scale described in the Employees' Compensation Ordinance of Hong Kong. RESULTS: Patients with injuries that corresponded to a loss of earning capacity of 12% or greater had a significant impairment in their hand function (P<0.05); the hand function of this group after their return to work significantly improved (P<0.05). There were no significant differences between the loss of earning capacity scores as calculated by the Hong Kong, American Medical Association, or Indian Medical Association scales. CONCLUSION: Patients whose loss of earning capacity of 12% or greater are likely to have significant long-term impairments of hand function. Thus, a more intensive rehabilitation programme should be provided to this group.

Journal Article↗