OBJECTIVES/HYPOTHESIS To investigate the relationship between handedness and the incidence of squamous cell carcinoma in the external auditory canal (EACSCC). MATERIALS AND METHODS Sixty-eight cases of EACSCC were enrolled in this study, and their affected side was checked. Handedness and ear-picking habits were also investigated in 34 EACSCC cases. Handedness was judged based on self-categor...

In the elite domain of interactive sports, athletes who demonstrate a left preference (e.g., holding a weapon with the left hand in fencing or boxing in a 'southpaw' stance) seem overrepresented. Such excess indicates a performance advantage and was also interpreted as evidence in favour of frequency-dependent selection mechanisms to explain the maintenance of left-handedness in humans. To test...

Evidence for population-level right-handedness in nonhuman primates seems inconsistent and contradictory, and many hypotheses have been advanced to account for this volatility. Funnel plots (scatter plots of percent right-hand use vs. sample size) offer a straightforward graphical technique for assessing: 1) the strength and consistency of handedness, 2) whether variability is consistent with n...

LEFT-HANDEDNESS AND RISK OF BREAST CANCER: ABUNDANCE OF CONFLICTING DATA Z. Stoyanov, P. Nikolova The present short review summarizes controversial data regarding the putative association between left-handedness and breast cancer. Factors thought to be involved in the etiology and pathogenesis of breast cancer are outlined: prenatal and postnatal levels of sex steroids, maternal age, age at men...

Discrepant input from vestibular and visual systems may be involved in motion sickness; individual differences in the organization of these systems may therefore give rise to individual differences in propensity to motion sickness. Non-right-handedness has been associated with altered cortical lateralization of vestibular function, such that non-right-handedness is associated with left hemisphe...

Eye preference in humans and its correlation with eye dominance, visual acuity and handedness. Eye preference in humans and its correlation with eye dominance, visual acuity and handedness. Handedness is the most obvious expression of lateralized behaviour in humans. However, there is only limited knowledge about other forms of lateralized behaviour, e.g. preferential use of an eye and whether ...

A growing body of evidence is reviewed showing that degree of handedness (consistent versus inconsistent) is a more powerful and appropriate way to classify handedness than the traditional one based on direction (right versus left). Experimental studies from the domains of episodic memory retrieval, belief updating/cognitive flexibility, risk perception, and more are described. These results su...