Determinants of sales and price at auction for three Australian Indigenous artists: to pool or not to pool?

Albert Namatjira (1902–1959), Emily Kame Kngwarreye (c1910–1996) and Rover (Julama) Thomas (c1926–1998) are three of Australia’s best-known Indigenous artists. Each is known for one style of painting—Namatjira for watercolor on paper, Kngwarreye for acrylic (synthetic polymer) on canvas and Thomas for natural earth pigments on canvas. We estimate a sample selectivity model using data from the Australian Art Sales Digest to study the determinants of sales and the hammer price of artworks offered at auction from these artists. The results show that pre-sale information on the artwork and auction effects are significant and that the three artists studied are very different from each other. Thus, data should not be pooled when estimating these models.     

The effect of westward travel across five time zones on sleep and subjective jet-lag ratings in athletes before and during the 2015’s World Rowing Junior Championships

This study examined sleep-wake habits and subjective jet-lag ratings of 55 German junior rowers (n = 30 male, 17.8 ± 0.5 years) before and during the World Rowing Junior Championships 2015 in Rio de Janeiro, Brazil. Athletes answered sleep logs every morning, and Liverpool John Moore’s University Jet-Lag Questionnaires each evening and morning. Following an 11-h westward flight with 5-h time shift, advanced bedtimes (?1 h, P < .001, η_p² = 0.68), reduced sleep onset latency (P = .002, η_p² = 0.53) and increased sleep duration (P < .001, η_p² = 0.60) were reported for the first two nights. Jet-lag symptoms peaked upon arrival but were still present after 6 days. Sleep quality improved (P < .001, η_p² = 0.31) as well as some scales of the Recovery-Stress Questionnaire for Athletes. Participation was successful as indicated by 11 of 13 top 3 placings. Overall, the initial desynchronisation did not indicate negative impacts on competition performance. As travel fatigue probably had a major effect on perceptual decrements, sleep during travel and time to recover upon arrival should be emphasised. Coaches and practitioners should consider higher sleep propensity in the early evening by scheduling training sessions and meetings until the late afternoon.     

Skydiving as emotion regulation: the rise and fall of anxiety is moderated by alexithymia

We investigated alexithymia and the fluctuation of anxiety in skydiving women. Alexithymia significantly moderated the pre- to postjump fluctuation of state anxiety such that only alexithymic skydivers' anxiety diminished as a consequence of performing a skydive. This suggests that skydiving is an effective means of emotion regulation for alexithymic women. However, the significant rise in anxiety shortly after landing suggests that any emotional benefits are short-lived. No anxiety fluctuations emerged for nonalexithymic skydivers. The Alexithymia x Time interaction remained significant when controlling for age, experience, and trait anxiety. Results are discussed in terms of the potential dependence on risk-taking activities for alexithymic women.