Infants’ sense of approximate numerosity: Heritability and link to other concurrent traits

The ability to perceive approximate numerosity is present in many animal species, and emerges early in human infants. Later in life, it is moderately heritable and associated with mathematical abilities, but the etiology of the Approximate Number System (ANS) and its degree of independence from other cognitive abilities in infancy is unknown. Here, we assessed the phenotypic specificity as well as the influence of genetic and environmental factors on the ANS in a sample of 5-month-old twins (N = 514). We found a small-to-moderate but statistically significant effect of genetic factors on ANS acuity (heritability = 0.18, 95% CI: 0.02, 0.33), but only when differences in numerosity were relatively large (1:4 ratio). Non-verbal ability assessed with the Mullen Scales of Early Learning (MSEL) was found to be heritable (0.47; 95% CI: 0.34, 0.57) and the phenotypic association between ANS acuity and non-verbal ability performance was close to zero. Similarly, we found no association between ANS acuity and general attention during the task. An unexpected weak but statistically significant negative association between ANS acuity and scores on the receptive language scale of the MSEL was found. These results suggest that early ANS function may be largely independent from other aspects of non-verbal development. Further, variability in ANS in infancy seems to, to some extent, reflect genotypic differences in the population.

Highlights

• Assessing 514 infant twins with eye tracking, we found that infants' sense of approximate numerosity is heritable and not positively associated with concurrent attentional, cognitive or motor abilities.
• These results have implications for our understanding of development of mathematical ability and the link between cognitive abilities early in postnatal life.

     

Organizing the voice questionnaire for transgender persons

Abstract

Background: The validated Transsexual Voice Questionnaire Male to Female (TVQ^MtF) and the adapted TVQ Female to Male (FtM) (TVQ^FtM) are both 30-item-long questionnaires used to evaluate self-perception of voice in transgender persons. They are part of a series of questionnaires completed by transgender persons during follow-up of cross-sex hormone therapy (CSHT).

Aim: The aim of this study was to examine if these questionnaires can be organized.

Methods: The TVQ^MtF or the TVQ^FtM was filled out at the start of CSHT, by 145 trans women and 83 trans men. Data were analyzed by factor analyses on both the questionnaires.

Results: The factor analyses resulted in a three-factor solution for both the TVQ^MtF and the TVQ^FtM. The three factors were labeled as anxiety and avoidance, vocal identity, and vocal function.

Conclusion: Both the questionnaires can be organized into three factors. This could contribute to making shorter versions of the questionnaires. Shorter versions would be useful to hormone prescribing physicians to track down more quickly voice problems in trans people undergoing virilizing or feminizing hormone treatment.     

Simple devices for restricting the visual fields of birds

The construction and use of several simple occluders designed for long-term use is described. They permit limiting vision either to one eye or to the frontal or lateral visual fields and permit rapid interchange among these conditions.     

Doctors as patients: How psychological therapists experience the opposing ideologies

Research suggests that doctors experience higher levels of stress and mental health problems than the general population. Doctors frequently experience difficulty seeking help, and also challenges during psychological treatment, due to role reversal and competing ideologies.

Focusing specifically on the under-researched area of doctors as patients in a psychological context, this paper explores the processes underlying role transition as well as the therapeutic relationship that follows.

Furthermore, therapeutic reactions and adaptions of practice to this dynamic is also explored. A qualitative approach was employed and seven psychological therapists who had worked extensively with doctors as their patients were interviewed.

Subsequent interview data were thematically analyzed.

Six themes were generated: fear and pressure; status and control; variation of ideologies; change in practice; temporal changes; and help seeking and support.

The main barrier to recovery for doctors is difficulty in accessing services owing to the high-levels of stigma and shame that may be experienced. This research identifies some of the adaptions made by psychological therapists within their practice when working with doctors as patients.