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Hands and Handles
Published in Stephen Pheasant, Christine M. Haslegrave, Bodyspace, 2018
Stephen Pheasant, Christine M. Haslegrave
For the majority of people, their right hand is dominant and they carry out most tasks with this hand. A significant minority (approximately 10%) have their left hand dominant, although this number probably underestimates the true percentage of left-handed people. Historically, during certain social periods and in certain cultures (and still today), children have been strongly discouraged from using their left hands. Even individuals with strong hand dominance will perform some tasks with the nondominant hand, but the common suggestion that left-handed individuals are more flexible and better able to use their nondominant hand is not true. Garonzik (1989) has shown clearly that left-handed people are at a considerable disadvantage in using workstations and equipment designed for right-handed users.
Individual Differences and Inclusive Design
Published in Constantine Stephanidis, User Interfaces for All, 2000
David Benyon, Alison Crerar, Simon Wilkinson
There can be few less controversial observations than that people differ in a variety of ways. Two important questions arise from this observation. First, how do people differ? We might agree that people differ in physical characteristics, such as height, weight, and girth, but beyond that we enter a potential minefield. People have different personalities, but what is personality? People have different cognitive skills and preferences, but how should these be classified and measured? Second, for our pragmatic purposes of improving the usability of computer systems, we must ask which differences are pertinent to HCI, what the range of variation is in the target population, and whether these differences are stable over time (fixed) or are changing, or changeable. For example, people can differ in their handedness, but does this matter for mouse use? Hoffmann, Chang, and Yim (1997) found that the performance of left-handed individuals habitually using a mouse with their right hand was not significantly different from that of right-handed users, so it seems that left-handers are not disadvantaged if they conform to standard practice.
A comparison of muscle activity, posture and body discomfort during the use of different computer screen sizes
Published in International Journal of Occupational Safety and Ergonomics, 2023
Praphatson Sengsoon, Kanruethai Siriworakunsak
The level of body discomfort after using a computer with 46.99 and 58.42-cm computer screen sizes was found to be statistically significantly higher than that before the test. In this study, the participants used computers for 1 h. A prolonged sitting posture with continuous typing could have affected muscle fatigue that may have caused increased body discomfort at the end of the test, which resulted in the same trend of body discomfort values for both screen sizes. Posture that is repeatedly in the same position increases muscle tension, leads to compression force and is related to WMSDs. Therefore, body discomfort is high in people who use a computer. Moreover, the study participants were right-handed dominant; thus, they performed most of their activities in life with a right hand. Consistent with a previous study, it was determined that when sitting for a long period of time, right-handed people had the highest risk of developing WMSDs in the neck and right shoulder [15,34]. The results of this study showed that body discomfort in the right shoulder and the neck was equal to 52.78 and 50%, respectively. In addition, good working posture was negatively correlated with body discomfort [33].
A Functional BCI Model by the P2731 working group: Physiology
Published in Brain-Computer Interfaces, 2021
Ali Hossaini, Davide Valeriani, Chang S. Nam, Raffaele Ferrante, Mufti Mahmud
Like other parts of the human body, the cerebral cortex is lateralized, that is, it possesses complementary sides. Even though the brain is not a sphere, by convention its sides are called the left and right hemispheres. One hemisphere is designated dominant, and this is visible in its contralateral control of hands. People with a dominant left hemisphere are right-handed, that is, it is easier to acquire fine motor control with their right hand. The opposite is true of people who have dominant right hemispheres. The neural organization that makes this possible is explained below.