The halls of the Barbers, Barber-Surgeons and Company of Surgeons of London.
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General Surgery↗
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The cyclopean (stereoscopic) barber pole illusion.
Across two experiments, this study found that the barber pole illusion (i.e. grating pattern appearing to move in the direction of the long axis of a rectangular aperture) is perceived with stereoscopic (cyclopean) motion. The grating and aperture comprising the barber pole display were created from binocular disparity differences embedded in a dynamic random-dot stereogram or from luminance differences. In Experiment 1, observers viewed a square-wave grating moving through a rectangular aperture of 2:1 or 4:1 aspect ratio and indicated whether the grating appeared to move in a direction perpendicular to its orientation or in the direction of the long axis of the aperture. For both stereoscopic and luminance stimuli equally, the grating appeared to move in the direction of the aperture (i.e. the barber pole illusion) more often with the larger aspect ratio than with the smaller aspect ratio. The condition for which a stereoscopic grating moved through a luminance rectangular aperture was also examined: the grating appeared to move in the direction of the aperture (inter-attribute barber pole illusion). In Experiment 2, observers viewed a square-wave grating moving through a rectangular aperture of 3:1 aspect ratio whose sides were indented in order to change the local direction of motion of the line terminators. For both stereoscopic and luminance stimuli, the grating appeared to move more frequently in a direction perpendicular to its orientation with the indented aperture (i.e. the illusion was diminished). Thus, local velocity signals from moving stereoscopic line terminators play a role in the production of the barber pole illusion similar to that of luminance motion signals. This suggests that the generation and propagation of motion signals at cyclopean levels of vision play a part in the representation of coherently-moving rigid surfaces.
Depth Perception↗
Barber-pole illusions and plaids: the influence of aperture shape on motion perception.
The barber-pole illusion and its influence on plaid perception were investigated in two experiments to test the following expectations: (i) apertures which bias the perception of grating motion in directions consistent with plaid direction will facilitate plaid perception, and (ii) apertures which bias the perception of grating motion in directions inconsistent with plaid direction will disrupt plaid perception. In experiment 1 the barber-pole illusion was measured as a function of grating orientation (20 degrees, 45 degrees, and 70 degrees, clockwise and counterclockwise from horizontal), and aperture shape (vertical, horizontal; at each of three elongations). Barber-pole illusions reported with 45 degrees gratings increased with increased aperture elongation. However, this was not found with 20 degrees and 70 degrees gratings; these were almost always reported as moving in a direction parallel to the side of the aperture with which the gratings formed angles approaching 90 degrees. In experiment 2 this dependence of barber-pole illusions on the relative orientation between gratings and apertures was also evident with 45 degrees gratings in oblique apertures; only oblique directions of grating motion were reported. The influence of the same apertures on the separate contrast thresholds required for initial plaid coherence and initial plaid decomposition was measured. In experiments 1 and 2, coherence thresholds were unaffected by apertures, contrary to expectation (i). However, in both experiments expectation (ii) was confirmed; decomposition thresholds decreased in apertures which biased perceived direction of gratings towards vertical (plaid direction), and increased in apertures which biased grating motion away from vertical. Adaptation of plaid mechanisms during measurement of decomposition thresholds was proposed to explain the discrepancy between coherence and decomposition data. Taken together, the results were interpreted as reflecting interactions between mechanisms mediating the barber-pole illusion and mechanisms mediating plaid perception.
Humans↗
The influence of aperture surfaces on the barber-pole illusion.
The magnitude of the barber-pole illusion is measured as a function of the contrast, orientation, and phase difference between the moving 'barber-pole' grating and a moving 'surround' grating that forms the aperture surface. It is found that as the difference between the barber-pole grating and the surround grating increases, the influence of surround motion on barber-pole motion decreases (resulting in an increase in the magnitude of the barber-pole illusion). This pattern of results is interpreted as evidence for competition between processes that detect the motion of line terminators along the length of the rectangular aperture and processes that detect grating motion in directions perpendicular to grating orientation.
Contrast Sensitivity↗
The barber-surgeons of London.
The Company of the Barber-Surgeons of London was formed by the union of the Company of Barbers and the Fellowship of Surgeons in 1540. It marked one of the great milestones in English surgery. The barbers had carried out minor surgery such as bleeding and lancing of abscesses, while the more erudite surgeons attempted to evolve some principles in surgery, and were involved in the mutilating surgery of warfare. The Barber-Surgeons became responsible for instigating teaching programs and the licensing of men to practice the art of surgery; they also appointed surgeons to the armed forces. An inevitable rift between these two different types of people occurred in 1745. The surgeons broke away and formed the Company of Surgeons, which, in 1800, became the Royal College of Surgeons.
Barbering↗
A seroepidemiologic study of hepatitis B virus infection among barbers in Huangshi City, Hubei, China.
Between March and August 1986 in Huangshi City, serum samples were collected from 316 apparently healthy barbers as a study group, as well as from 361 healthy employees of department stores as a control group. They were tested for hepatitis B surface antigen (HBsAg), antibody to HBsAg (anti-HBs) and antibody to hepatitis B core antigen (anti-HBc) by enzyme-linked immunoadsorbent assays. Barbers showed a prevalence higher than that in controls for HBsAg (16.8 vs. 9.2%, P less than 0.01), anti-HBs (67.1 vs. 45.9%, P less than 0.001), and anti-HBc (39.2 vs. 21.2%, P less than 0.001). The prevalence of at least one marker of hepatitis B virus (HBV) infection was significantly higher in barbers than in controls (86.1 vs. 61.7%, P less than 0.001). Although the socioeconomic status and education level did not correlate with the frequency of HBV markers, the prevalence of HBsAg increased in parallel with the duration of practice. Because of their high risk for HBV infection, barbers need to be screened for markers of HBV infection on a routine basis, and are prime candidates for immunoprophylaxis with hepatitis B vaccine.
Adolescent↗
[From barber-surgeons' guild to medical association. A 400th anniversary].
The barber-surgeons' guild in Bergen was founded on 17 January 1597. For nearly 250 years this was the only "medical association" in Norway. The guild disappeared with the death of its latest master, Christian Wilhelm Wisbech (1740-1822). However, only nine years later his son, Christian Wisbech (1801-69), founded the Medical Association in Bergen. The barber-surgeons were craftsmen who got their education by apprenticeship. They were the medical practitioners of their times. Their empirical knowledge was more in touch with real life than was the medicine taught by the professors. This paper describes the barber-surgeons' education and work, including their conflicts with other craftsmen and doctors. During the 18th century the barber-surgeons' education was improved, and eventually was given full academic status.
Barber Surgeons↗
Antigenic analysis of Barber's protein antigen prepared from Salmonella typhi and demonstration of protein-specific antibodies in sera of typhoid patients.
A crude protein antigen (Barber's antigen) was prepared from Salmonella typhi by mild extraction with veronal buffer followed by repeated precipitation with trichloracetic acid according to the method of Barber. From serological studies and polyacrylamide gel electrophoresis, Barber's antigen was found to be highly heterogeneous and contain both the lipopolysaccharide and Vi antigens in addition to the protein antigens. Nevertheless antibodies specific to the proteins in the Barber's antigen were demonstrated in typhoid patients' sera by radioimmunoassay, indicating that proteins were also a major antigenic component of S. typhi and might play a role during typhoid infection.
Antibodies, Bacterial↗
Leonardo Fioravanti (1517-1588): a barber-surgeon who influenced the development of reconstructive surgery.
Surgery in the Middle Ages was practiced by individuals belonging to the guild of barbers, with no basic medical education. The transformation into a scientific branch of medicine began in the sixteenth century. In this process, a great role was the one played by Leonardo Fioravanti. He was a Doctor in Medicine graduated from the University of Bologna. A controversial man, he was also an innovation in many fields of medicine, such as prevention of diseases, pharmacology, therapy, etc., and he was a surgeon himself. On the way back from one of the last Crusades, he visited the Vianeos brothers in Calabria, and he was able to learn from them the technique for reconstructing the nose that had been devised by Antonio Branca in the previous century and still practiced only by barber-surgeons. He published his experience in a book that probably inspired the contemporary, Gaspare Tagliacozzi, Professor at the University of Bologna, and allowed him to become acquainted with this kind of reconstructive surgery. Tagliacozzi understood the value of the method described by Fioravanti and transformed a barber-surgery technique into a remarkable chapter of scientific surgery by divulging in the academic circles the principles of the pedicled flap, which have been the basis for development of modern plastic surgery.
Barber Surgeons↗
The extrinsic/intrinsic classification of two-dimensional motion signals with barber-pole stimuli.
The perceived direction of different barber-pole stimuli was assessed by adjusting an arrow on the screen. The terminator ratio (TR: number of terminators moving along the long side divided by the number of terminators moving along the small side) was either one or three. In this latter case, the aperture orientation was either vertical or horizontal. The grating was either in the same plane as the aperture (intrinsic condition) or behind the aperture--the frame containing the aperture had a crossed disparity relative to the grating--(extrinsic condition). A nested design with 120 observers was used for the whole study. Five grating orientations were intermingled within any session. With a terminator ratio of three, the results depend strongly on the aperture's orientation. When the rectangular aperture is horizontal, the perceived direction of an intrinsic grating is horizontal (the typical barber-pole illusion), whereas it is only slightly biased towards orthogonal one-dimensional (1D) motion signals (Vp) in the extrinsic condition. When the aperture is vertical, the perceived direction in the intrinsic condition is largely biased toward Vp, and on average it is close to Vp in the extrinsic condition. In this latter case, however, analysing the distributions of responses shows that many responses do not lie around Vp but are clustered near vertical or horizontal. This motion capture depends on the grating's orientation. With a terminator ratio of one, motion capture is present in both the extrinsic and intrinsic conditions. Moreover, a global bias toward horizontal is observed: this horizontal bias is much larger in the extrinsic condition. Altogether, these results suggest that binocular disparity alone is a weak determinant of the extrinsic/intrinsic classification of two-dimensional (2D) motion signals compared to the occlusion cues provided by unpaired regions in binocular images. Second, truly extrinsic 2D motion signals are not suppressed but rather actively compete against each other to capture the 1D motion signals. This results in a perceptual multistability which is much stronger with extrinsic signals. Finally, given the inherent multistability of barber-pole stimuli, high-level factors can alter the strength of this competition and prime any of the 2D motion signals.
Discrimination, Psychological↗
Marshall Barber and the origins of micropipette methods.
Current methods for the study of renal physiology depend heavily on the use of micropipettes fashioned from glass capillary tubes. The technique for making glass micropipettes and manipulating them in the field of a compound microscope appears to have been invented about 1904 by Marshall A. Barber, a bacteriologist at the University of Kansas. Barber's methods were passed on and successively modified by G. L. Kite and R. Chambers, and were finally adapted for renal studies by A. N. Richards. The apparatus for perfusing isolated segments of renal tubules in vitro is remarkably similar to the original device used by Barber over three-quarters of a century ago.
Bacteriological Techniques↗
[Transmission of "barber's itch" by bathing?].
Pathogenic fungi find a favourable environment in baths for multiplication and distribution. So diseases caused by dermatophytes are often observed in connection with a visit of a bath. With regard to transmission of a "barber's itch" caused by fungi in consequence of the visit of a bath, there have still no results been published. Considering previous knowledge about epidemiology, mechanism of invasion, living, and multiplication of pathogenic fungi it seems unlikely that a transmission of the germs of "barber's itch" takes place due to the visit of a public bath. The expression "barber's itch" is not uniformly used; thus, if visitors make complaints about this affection, an etiological differentiation is required.
Arthrodermataceae↗
[Professional heritage and social origin of the Württemberg barber surgeons of the 19th century].
In nineteenth-century Württemberg, barber surgeons (Wundärzte) were subdivided into various grades. They were increasingly confronted with severe governmental restrictions that both threatened their professional image and weakened their economical prospects. Therefore an archival study has been made on behalf of the social background of surgical examines by means of their father's occupation. As a result it could be shown that more than half the registered fathers were barber surgeons themselves. About 20 percent of the surgical candidates were recruited from the craft, whereas physicians, apothecaries and other professionals could hardly be found. Even pastors, that were supposed to be professionally linked with surgeons, were rarely made reference to. The candidates were classified into two groups, according to different periods of time (1800 to 1829 and 1830 to 1873). As to the social origin of the examinees, no appreciable differences between both periods could be found.
Barber Surgeons↗
The British use of the Barber Suggestibility Scale: norms, psychometric properties and the effects of the sex of the subject and of the experimenter.
The Barber Suggestibility Scale, as a measure of hypnotic susceptibility, was administered to 130 British undergraduate students by 13 student experimenters in a 2 x 2 factorial design withe sex of the subject and the sex of the experimenter as the two variables. The results showed no significant differences among the scores obtained by the 13 experimenters and no significant effect of either the subject's sex or the experimenter's sex though there was some tendency towards an interaction effect. The distribution of scores from the present sample was similar to the American norms reported by Barber (1965) except for slightly lower means on certain test-suggestions. The scale also showed satisfactory internal consistency and item-scale correlations. A principal components analysis revealed evidence for a general factor underlying the scale in addition to three special factors associated with direct motor, motor challenge and cognitive suggestions which confirms the work of Hilgard (1965) on the Stanford scales. The distinction between objective and subjective responses to suggestions is discussed and some improvements are recommended in the scale. It was concluded that the BSS appears to be a simple and reliable measure of hypnotic susceptibility and is suitable for British usage.
Female↗
[Interdigital pilonidal sinus in barbers].
Three cases of barber's hair sinus of the hand are presented. The lesion is produced by the penetration of extraneous short hairs into the interdigital spaces of the hand. The hairs produce an inflammatory reaction and foreign body granuloma. The clinical picture is usually benign but can be complicated by repeated infection which may require surgery. The structure of the lesions varies from epithelial-lined tract, cyst with surrounding foreign body reaction, to fibrotic cicatricial tissue. The exact reasons for the lesion are not known, but several theories are offered. It is, however, clear that since the 1970's Italian barbers have changed their methods of cutting hair, using their hands more than the customary instruments, i.e., combs, brushes, etc. The authors discuss the occupational problems due to the complications of disabling lesions.
Adult↗
[Barber-Johnson analysis of bed utilization in hospital-based health care in the Croatian Republic during peace and war:1986-1991].
Intensity of bed utilization in Croatia's hospitals in the peace-time period 1986-90 and the war year of 1991 was evaluated. The study covered 32 general-and-teaching hospitals disposing with 21,300 beds in 1986-90 and 27 of these hospitals with 19.000 beds in 1991. Basic information derives from hospital's statistical reports analyses by the Barber-Johnson's technique. While length of stay was reduced in the 1986-90 period, average number of discharges and deaths per available beds increased (1986/26.1; 1990/26.9). In the peace year of 1990 the performances of 11 of the 32 hospitals grouped in a zone limited to 10.0-12.9 days for the length of stays and 1.1-2.5 days for turnover interval. In the war year of 1991 the performances of 10 of the 27 hospitals were grouped in a zone defined by 8.5-10.9 days for length of stay and by 3.1 and 6.2 days for turnover interval. The Barber-Johnson's analysis provides key information in the decision making about hospital beds utilization, as well as in the evaluation of such decisions.
Bed Occupancy↗
[Interdigital pilonidal sinus ("barber's disease")--a rare occupational disease].
Barber's disease is produced by short hairs that penetrate the interdigital spaces of the hands. The following chronic inflammatory reaction causes fistulas or sinuses and cysts. We present the case of a patient with interdigital pilonidal sinuses of all web spaces in both hands. Such an extensive case of this occupational disease has so far not been reported.
Barbering↗
Barber's interdigital pilonidal sinus of the hand: a foreign body hair granuloma.
Interdigital pilonidal sinus of the hand is an occupational disease of male barbers. Customers' hairs penetrate the supple interdigital skin, cause a sinus, and later a cyst. Through the sinus, the hairs get entrapped and may occasionally be expressed. Excision of the sinus or the cyst is curative.
Barbering↗