Do cuckoos choose nests of great reed warblers on the basis of host egg appearance?

Prevailing theory assumes cuckoos lay at random among host nests within a population, although it has been suggested that cuckoos could choose large nests and relatively active pairs within host populations. We tested the hypothesis that egg matching could be improved by cuckoos choosing nests in which host eggs more closely match their own, by assessing matching and monitoring nest fate in great reed warblers naturally or experimentally parasitized by eggs of European cuckoos. A positive correlation between cuckoo and host egg visual features suggests that cuckoos do not lay at random within a population, but choose nests and this improves egg matching: naturally parasitized cuckoo eggs were more similar to host eggs as perceived by humans and as measured by spectrophotometry. Our results suggest a hitherto overlooked step in cuckoo-host evolutionary arms races, and have nontrivial implications for the common experimental practice of artificially parasitizing clutches.

The role of ultraviolet-A reflectance and ultraviolet-A induced fluorescence in the appearance of budgerigar plumage: insights from spectrofluorometry and reflectance spectrophotometry

Fluorescence has so far been found in 52 parrot species when illuminated with ultraviolet-A (UVA) 'black' lamps, and two attempts have been made to determine whether such fluorescence plays any role in sexual signalling. However, the contribution of the reflectance versus fluorescence to the total radiance from feathers, even in the most studied species to date (budgerigars), is unclear. Nor has the plumage of this study species been systematically assessed to determine the distribution of fluorescent patches. We therefore used spectrofluorometry to determine which areas of budgerigars fluoresce and the excitation and emission spectra involved; this is the first time that such a technique has been applied to avian plumage. We found that both the yellow crown and (normally hidden) white downy chest feathers exhibit strong UVA-induced fluorescence, with peak emissions at 527 nm and 436 nm, respectively. Conversely, the bright-green chest and dark-blue tail feathers do not fluoresce. When comparing reflectance spectra (400700 nm) from the yellow crown using illuminants with a proportion of UVA comparable to daylight, and illuminants with all UVA removed, no measurable difference resulting from fluorescence was found. This suggests that under normal daylight the contribution of fluorescence to radiance is probably trivial. Furthermore, these spectra revealed that males had fluorescent crowns with substantially higher reflectance than those of females, in both the UV waveband and at longer wavelengths. Reflectance spectrophotometry was also performed on a number of live wild-type male budgerigars to investigate the chromatic contrast between the different plumage areas. This showed that many plumage regions are highly UV-reflective. Overall our results suggest that rapid surveys using UVA black lamps may overestimate the contribution of fluorescence to plumage coloration, and that any signalling role of fluorescence emissions, at least from the yellow crown of budgerigars, may not be as important as previously thought.

A comparison of the ICI Pillbox and the Random Tumble Methods is assessing pilling and appearance change of worsted spun cashmere and cashmere-wool blend knitwear

This study evaluated the differences between two international test methods on the assessment of pilling and appearance change of worsted spun cashmere and superfine wool knitwear and their blends. Differences between the standard ICI Pill Box Method and the Random Tumble Method were found in both the significance and magnitude of resistance to pilling and appearance change and the amount of fabric mass loss of worsted spun cashmere and cashmere superfine wool blend knit fabrics. The ICI Pill Box Method differentiated to a greater extent the effects of wool type and blend ratio of cashmere and wool compared with the Random Tumble Method. Generally the addition of cashmere or low crimp superfine wool resulted in fabrics being more resistance to pilling and appearance change compared with fabrics made from high crimp superfine wool. This was associated with increased fabric mass loss when assessed by the ICI Pill Box Method but not with the Random Tumble Method. KEYWORDS: Cashmere, crimp, wool, pilling, appearance change, knitwear

Social comparisons, appearance related comments, contingent self-esteem and their relationships with body dissatisfaction and eating disturbance among women

This study examined social comparisons, appearance related comments and contingent self-esteem, and their relationships with body dissatisfaction and eating disturbance in young adult women. Importantly, the role of both positive and negative appearance related comments, and upward and downward comparisons, were investigated. A self-report questionnaire assessing each of these variables was completed by one hundred and ninety-six women aged 18–35. A higher frequency of negative comments and contingent self-esteem were associated with higher upward comparisons, and more positive comments were associated with higher downward comparisons. Overall, social comparisons were shown to be more important than verbal commentary and contingent self-esteem. More upward comparisons and less downward comparisons uniquely predicted higher body dissatisfaction and eating disturbance. In addition, negative appearance comments were found to be more salient than positive comments. Negative comments and contingent self-esteem uniquely predicted more eating disturbance but positive comments were not a predictor of body dissatisfaction or eating disturbance. Longitudinal studies are now required to establish the direction of these relationships and to more fully examine the interplay among the factors. In addition, given that our study only assessed self-reported social comparisons, our findings need to be validated against experimental methods.

Recognition from appearance subspaces across image sets of variable scale

Linear subspace representations of appearance variation are pervasive in computer vision. In this paper we address the problem of robustly matching them (computing the similarity between them) when they correspond to sets of images of different (possibly greatly so) scales. We show that the naïve solution of projecting the low-scale subspace into the high-scale image space is inadequate, especially at large scale discrepancies. A successful approach is proposed instead. It consists of (i) an interpolated projection of the low-scale subspace into the high-scale space, which is followed by (ii) a rotation of this initial estimate within the bounds of the imposed “downsampling constraint”. The optimal rotation is found in the closed-form which best aligns the high-scale reconstruction of the low-scale subspace with the reference it is compared to. The proposed method is evaluated on the problem of matching sets of face appearances under varying illumination. In comparison to the naïve matching, our algorithm is shown to greatly increase the separation of between-class and within-class similarities, as well as produce far more meaningful modes of common appearance on which the match score is based.

Proving a negative in history: the non-appearance of the Hungarian football team at the Melbourne Olympic Games in 1956

In this article we examine why Hungary, despite having the best football team in the world, did not enter the competition at the 1956 Melbourne Olympic Games. We examine several explanations and find them to be based on errors and misconceptions. Given the significance of sport in socialist societies, we believe that the most likely explanation lies in the relationship between the Hungarian communist regime and that of the Soviet Union. Ongoing archival research suggests that the Hungarian regime did not enter a football team because it wanted to assist the Soviet Union in winning the gold medal, which it was thought would demonstrate the moral superiority of communism. This proposition is supported by a 2012 interview with Jenö Buzánszky, one of the two survivors of the Hungarian team.

ABC National Television - Guest appearance (live)

ABC Television (ABC1 & ABC News 24) - Guest appearance (live).Due to my expertise in media, I was invited to be a guest reviewer of the daily newspapers on national television. This was a live interview, lasting 10 minutes.

ABC Television (ABC1 & ABC News 24) - Guest appearance (live)

ABC Television (ABC1 & ABC News 24) - Guest appearance (live).Due to my expertise in media, I was invited to be a guest reviewer of the daily newspapers on national television. This was a live interview, lasting 10 minutes.

ABC Television (ABC1 & ABC News 24) - Guest appearance (live)

ABC Television (ABC1 & ABC News 24) - Guest appearance (live).Due to my expertise in media, I was invited to be a guest reviewer of the daily newspapers on national television. This was a live interview, lasting 10 minutes.

ABC Television (ABC1 & ABC News 24) - Guest appearance (live)

ABC Television (ABC1 & ABC News 24) - Guest appearance (live).Due to my expertise in media, I was invited to be a guest reviewer of the daily newspapers on national television. This was a live interview, lasting 10 minutes.

ABC Television (ABC1 & ABC News 24) - Guest appearance (live).

ABC Television (ABC1 & ABC News 24) - Guest appearance (live).Due to my expertise in media, I was invited to be a guest reviewer of the daily newspapers on national television. This was a live interview, lasting 10 minutes.

ABC Television (ABC1 & ABC News 24) - Guest appearance (live).

ABC Television (ABC1 & ABC News 24) - Guest appearance (live).Due to my expertise in media, I was invited to be a guest reviewer of the daily newspapers on national television. This was a live interview, lasting 10 minutes.