Laterality最新文献

The overrepresentation of left-handers among professional Western artists has been attributed to the lateralization of the human brain, suggesting that left-handed individuals are more creative and more likely to become artists. We aimed to test this notion among a non-industrialized population. We conducted a study in the Asmat region of Papua, renowned for their abundance of wood carving artists. The participants (N = 231), of which 42% were professional artists, took part in creativity and hand skill asymmetry testing. Our study revealed a lower proportion of right-handers in these populations. Although artists demonstrated higher levels of creativity and more dexterity in both hands, we found no evidence to support the notion that left-hand skill asymmetry is associated with creativity or becoming an artist. The results of our study challenge the notion that left-handed people are more likely to become artists and that they are more creative. It could be that this effect is specific to Western populations.

While discrimination based on race, gender, and other factors is well-documented, the discrimination faced by left-handed individuals is often overlooked. To address this gap, a study developed the Perceived Handism Discrimination Scale (PHDS) to assess how left-handed people perceive discrimination related to their hand preference. The original questionnaire consisted of 20 items using a 7-point Likert scale and was evaluated by experts using Lawshe's methodology. After refinement, the scale was reduced to 12 items, and further analysis through Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) with two separate samples (n=200 each) led to a final scale of 10 items clustered around two significant factors: cultural and individual dimensions of perceived handism discrimination. The PHDS demonstrated good psychometric properties, including reliability and statistical significance in factor analyses. However, the fit of the assumptions underlying EFA and CFA was not ideal, suggesting that further refinement is needed. Despite this, the PHDS represents a valuable tool for identifying perceived handism discrimination, ultimately aiming to inform policies that mitigate its effects in society.

An analysis of the handedness of the four members of the British rock band The Beatles is presented. Implications for the roles of the left and right hands in the playing of different musical instruments, for the roles of the left versus right hemispheres in song writing, and for the Beatle's legacy in popular culture are discussed.

This study compares results from three dichotic listening experiments involving different methods of attention control. In each experiment, participants completed a dichotic listening task requiring two responses to syllables and we noted the order of report for the responses. In Experiment 1, participants reported from a specific ear first in trial blocks. In Experiment 2, an arrow cue indicated the ear of first report. In Experiment 3, a tone was presented to the ear of first report. Free recall in which participants reported the two syllables in any order was also included as a baseline. Results indicated a tendency to report from the right ear first in free recall, producing more reports from that ear, reflecting a right ear advantage (REA). In all cueing conditions, an overall REA emerged but it shifted to a left ear advantage (LEA: more reports from the left ear) when the left ear was cued. Additionally, larger laterality scores ([Right - Left]/[Right + Left]) for the conditions where the right ear was cued, relative to where the left ear was cued, suggests that attention control is limited in overriding the structural auditory asymmetries. We discuss the implications of these results for models of dichotic listening.

Athletes in bodybuilding can pose favouring one side or the other of the body while being evaluated in the contests. While previous research assessed lateral bias of posing in a variety of situations, no investigation has been conducted in bodybuilding. We analyzed the lateral posing bias of the Top 15 athletes for the mandatory poses in Classic Physique Mr. Olympias (2016-2023). Results revealed a general bias to the right in all poses, as either moderately or strongly right-lateralized poses were most frequent. Furthermore, "Front Double Biceps" pose was the most symmetrical, while "Your Favorite Classic Pose" was the most asymmetrical one-apart from the always lateralized "Side Chest". Interestingly, lower-placed athletes (Top 15) posed significantly more often to the right in "Side Chest", as compared to the Top 5 and Top 10 competitors. These findings contrast the left bias shown in portraiture and photography literature, likely as a consequence of motor constraints and coordination for athletes to pose to the right, along with the level of emotional expressiveness a bodybuilder may wish to reveal on stage. Our data expand previous results of posing asymmetry to the sport of bodybuilding in this pioneering research into the lateral bias of posing.

Facial emotion processing (FEP) tends to be right hemisphere lateralized. This right-hemispheric bias (RHB) for FEP varies within and between individuals. The aim of the present research was to examine evidence pertaining to the prominent theories of FEP hemispheric bias as measured by a half-emotional half-neutral (no emotion) chimeric faces task. FEP hemispheric bias was indexed using laterality quotients (LQs) calculated from a Chimeric Faces Task completed by 427 adults recruited from the general population aged 18-67 years. Participants indicated which of two identical (but mirrored) emotional-neutral chimeric faces were more emotive. While all investigated emotions (fear, anger, and happiness) were right lateralized, fear was significantly more right lateralized than anger and happiness. These results provide evidence for both the right hemisphere hypothesis and the motivational hypothesis of emotion perception.

ABSTRACTPerching or standing on one foot is commonly reported in birds but the level of consistency in using one foot over the other has been less-well documented in most species, particularly birds of prey. For birds experiencing colder temperatures, unipedal perching has been attributed to limiting heat loss through unfeathered legs and feet; individuals should spend longer periods of time perched on one foot as temperatures decrease. Using radio tracking, I collected 486 hours of observations on nine overwintering, free-living merlins (Falco columbarius) in Saskatoon, Canada. Five merlins displayed clear preferences to perch on one foot, however the direction of preference was not consistent and four birds were ambidextrous. There was a curvilinear response in the proportion of time spent in unipedal posture versus temperature, with a peak of ∼22% of the time at moderate temperatures (-10 to -19°C), but lower values at warmer and colder temperatures; the main effect of the squared term for temperature was highly influential while individual foot preference had no impact on the use of unipedal perching. Although preferential use of one foot for perching was displayed by some individuals, thermoregulation may not be the primary driver of this behaviour at colder temperatures.

Age-related changes pose challenges in speech processing for older adults. However, little is known about the role of auditory perceptual ability in their performance in dichotic listening tasks. The present study investigated how older adults' auditory perceptual abilities affected their correct rates and the right ear advantage (REA) in the dichotic listening tasks in two experiments. In Experiment 1, older adults' performance was assessed using dichotic listening tasks based on consonant-vowel (CV) words varying in consonants, vowels, and lexical tones, each presenting distinct auditory perceptual demands. It was found that older adults exhibited decreased correct rates as auditory perceptual demands increased. Moreover, differences in the REA were observed in older listeners, suggesting increased engagement of the hemisphere responsible for acoustic analysis in processing challenging dichotic stimuli. Experiment 2 examined how older individuals' acoustic processing abilities contributed to their dichotic listening performance. It was shown that older adults with acoustic processing abilities comparable to those of younger individuals demonstrated correct rates and REAs similar to those of younger cohorts. These results revealed the nonnegligible role of acoustic processing in the dichotic listening paradigm and the significance of considering listeners' auditory perceptual abilities in investigating language lateralisation using the dichotic listening paradigm.

This study aimed to compare the dominant and non-dominant eyes of healthy individuals in terms of CT and CVI values to assess the effect of ocular dominance on choroidal morphology. Three hundred eyes of 150 individuals were included in this study. All patients underwent routine ophthalmological examinations and hole-in-the-card tests to determine the dominant eye. EDI-OCT was used to obtain choroidal images. Choroidal thickness (CT) was measured at three points on the choroid including the subfoveal region (subfoveal choroidal thickness (SFCT)), 1500 μm nasal (NCT) and temporal (TCT) to the fovea. Choroidal vascularity index (CVI), total choroidal area (TCA), luminal area (LA), and stromal area (SA) were measured at fovea-centered choroidal area by image binarization via Image J software. While 93(%62) participants were right-eyed, 57(%38) participants were left-eyed. We could not detect any difference in SFCT, NCT, TCT, TCA, LA, SA, and CVI measurements between the dominant and the non-dominant eyes. (p > 0.05 for all). We could not detect any effect of ocular dominance on choroidal structures. These results also support the use of randomized ocular data regardless of which eye is dominant when investigating CVI and CT in scientific research.