Mixed-footedness is a more relevant predictor of schizotypy than mixed-handedness

Tran, Ulrich S.; Stieger, Stefan; Voracek, Martin

doi:10.1016/j.psychres.2014.11.069

Cited by 18 publications

(19 citation statements)

References 41 publications

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“…Utilizing only the most informative items of this instrument (Tran et al, 2015), we further raised the statistical conclusion validity in our study. The recent meta-analysis by Córdova-Palomera et al (2015) exploring the link between SOB and sub-clinical psychosis used heterogeneous outcome measures including not only the SPQ, but also the Chapman Psychosis Proneness Scale (CPPS; Chapman et al, 1978;Eckblad and Chapman, 1983;Eckblad et al, 1982).…”

Section: Discussionmentioning

confidence: 58%

“…Note that independently of the psychometric properties of items, values of Cronbach alpha decrease with decreasing scale length, and that this decrease is even non-linear for scales with less than 19 items (Cortina, 1993). In the present study, items were selected based on their high loadings on their designated factors and their negligible cross-loadings on the other factors (see Tran et al, 2015). Seemingly low values of Cronbach alpha in the present study must therefore be considered a methodological artefact due to scale length and do not reflect low reliability of measurement.…”

Section: Methodsmentioning

confidence: 97%

“…In addition to a total score, the questionnaire also measures schizotypy on three subscales, namely Cognitive-Perceptual, Interpersonal, and Disorganized symptoms. Following previous psychometric recommendations (Tran et al, 2015), we used only the ratings in the 12 most informative items of the SPQ-B to compute total and subscale scores. Cronbach's alpha in the current sample was α¼0.69 for total scores (12 items), α¼0.66, α¼0.66, and α¼0.69 for the Cognitive-Perceptual (3 items), Interpersonal (5 items), and Disorganized subscale (4 items), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Part of this sample (n ¼2873) stemmed from Tran et al (2015) and were pooled with novel data of n ¼5241 subjects. Detailed characteristics of the total sample are depicted in Table 1.…”

Section: Participants and Proceduresmentioning

confidence: 99%

See 3 more Smart Citations

Season of birth and population schizotypy: Results from a large sample of the adult general population

Konrath

Beckius

Tran

2016

Psychiatry Research

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Section: Discussionmentioning

confidence: 58%

Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

“…Part of this sample (n ¼2873) stemmed from Tran et al (2015) and were pooled with novel data of n ¼5241 subjects. Detailed characteristics of the total sample are depicted in Table 1.…”

Section: Participants and Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

Season of birth and population schizotypy: Results from a large sample of the adult general population

Konrath

Beckius

Tran

2016

Psychiatry Research

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“…Several studies have proven the association between schizotypy and schizophrenia with mixed handedness and mixed footedness. 23 This study has shown that positive history of retraining and handedness are statistically significant. Hence, individuals who have been retrained for switching of left handedness and have successfully switched over to right handedness/mixed handedness should be followed-up for adverse events like stuttering, stammering, dyslexia, personality problems, and psychiatric manifestations which are probable side effects of the induced cerebral confusion.…”

Section: Discussionmentioning

confidence: 70%

Are Footedness and Lateral Postures Better Predictors of Hemispheric Dominance Than Handedness: A Cross-sectional Questionnaire-Based Clinical and Pedigree Study

Muraleedharan

Ragavan

Devi

2019

JNRP

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Objective Approximately 9 out of 10 individuals show right-hand dominance. The remaining 10% include left-hand dominant and mixed handed/ambidextrous individuals. Laterality, lateral postures or lateral preference is defined by various authors as the most comfortable posture that an individual prefers to assume. The current study aims at finding the distribution of these lateral postures and their correlation with handedness/dominant side. Materials and Methods The study was done in medical and nursing students in the age group 18 to 22 years. The patients were asked to fill a self-assessment questionnaire to determine handedness and footedness. The laterality traits were observed by asking the patients to do by themselves after an untailored demonstration. Statistical Analysis The relationship between study parameters was assessed using Chi-square test. Pearson’s correlation test was done to assess the strength of association between comfort ratings of the various laterality postures. Results In our study, 96.5% were right handed and 79.9% of patients were right footed. Also, 50.8% preferred right-hand clasping, 53.9% preferred left-arm folding, and 60.6% preferred right-leg folding. A statistically significant correlation was seen between foot preference and lateral postures and arm folding and hand clasping (p < 0.05). A significant association was also found between handedness and positive history of retraining. Sidedness did not follow any Mendelian pattern of inheritance. Conclusions Handedness is affected by genetic and environmental factors. Since cultural and traditional practices can affect the lateral postures and handedness, it is important to know the relationship between laterality postures and sidedness and the impact of retraining on them. These postures are measures of cerebral dominance and are clinically important.

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Associations of Bisexuality and Homosexuality with Handedness and Footedness: A Latent Variable Analysis Approach

2018

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Non-right-handedness appears to be more common among bisexuals and homosexuals than among heterosexuals, which might be indirect evidence of effects of prenatal androgen exposure. Current data suggest higher prenatal testosterone levels among bisexual and homosexual women, but are inconclusive for men. This study examined the association between sexual orientation and non-right-handedness for sex differences and whether higher rates of mixed-handedness, rather than left-handedness, might be the driving factor. This allowed for more specific tests regarding the predictions of two competing theories of prenatal androgen exposure, the Geschwind–Galaburda theory and the callosal hypothesis, than in previous research. Being a potentially better indicator of cerebral lateralization than handedness, associations with footedness were also explored. To counter inconsistencies and shortcomings of previous research, we utilized two large discovery and replication datasets ( n s = 2368 and 1565) and applied latent variable analysis to reliably classify lateral preferences (i.e., handedness, footedness). This maximized the statistical conclusion validity and allowed for direct tests of replicability. Sexual orientation was differentially associated with lateral preferences among men and women. Associations among women were consistent with predictions of the Geschwind–Galaburda theory, whereas among men they were consistent with predictions of the callosal hypothesis. The results were further consistent with models of homosexuality that suggest a role of parental epigenetic marks on sexually dimorphic fetal development. Research efforts should be increased with regard to footedness and epigenetic theories of homosexuality.

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Mixed-footedness is a more relevant predictor of schizotypy than mixed-handedness

Cited by 18 publications

References 41 publications

Season of birth and population schizotypy: Results from a large sample of the adult general population

Season of birth and population schizotypy: Results from a large sample of the adult general population

Are Footedness and Lateral Postures Better Predictors of Hemispheric Dominance Than Handedness: A Cross-sectional Questionnaire-Based Clinical and Pedigree Study

Associations of Bisexuality and Homosexuality with Handedness and Footedness: A Latent Variable Analysis Approach

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