Research evaluating various treatment approaches for bulimia relies heavily upon one form or another of self‐report of binges and purges. Questionnaire and summary estimates of bingeing and purging taken before and after treatment have been utilized in many cases, although daily eating diaries are now increasingly employed. The relative accuracy of these different self‐report formats has never been assessed, making it difficult to compare treatment outcomes across studies where different measures were used. In the present report participants in a 10‐week cognitive‐behavioral therapy group for bulimia maintained detailed daily eating diaries that were objectively evaluated using operational definitions of binges and purges. These diary scores were then compared with data collected via weekly summary report record sheets and the Hawkins and Clement (1980) Binge Scale Questionnaire. Results showed significant reductions in self‐reported binges, self‐reported purges, and total Binge Scale Questionnaire scores. However, binge and purge frequencies derived from objective ratings of eating diaries, questionnaire items from the Binge Scale that asked about binge frequecy and purge probability, and the number of calories consumed per binge remained essentially unchanged from before to after treatment. These results suggest that investigators/clinicians studying bulimia should use multiple measures of assessment, including objective analyses of self‐reported data using standard criteria.

We present an analysis of the electronic and plasmonic behavior of periodic planar distributions of sufficiently wide graphene nanoribbons, for which a thorough ab initio investigation is practically unfeasible. Our approach is based on a semi-analytical model whose only free parameter is the charge carrier velocity, which we estimate by density-functional theory calculations on graphene. By this approach, we show that the plasmon resonance energies of the scrutinized systems fall in the lower THz band, relevant for optoelectronic and photonic applications. We further observe that these energies critically depend on the charge carrier concentration, ribbon width, electron relaxation rate, and in-plane transferred momentum angle, thus, suggesting a tunability of the associated light-matter modes.

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