Recent neuropharmacological research has suggested that certain constituents of tea may have modulatory effects on brain state. The bulk of this research has focused on either L-theanine or caffeine ingested alone (mostly the latter) and has been limited to behavioral testing, subjective rating, or neurophysiological assessments during resting. Here, we investigated the effects of both L-theanine and caffeine, ingested separately or together, on behavioral and electrophysiological indices of tonic (background) and phasic (event-related) visuospatial attentional deployment. Subjects underwent 4 d of testing, ingesting either placebo, 100 mg of L-theanine, 50 mg of caffeine, or these treatments combined. The task involved cued shifts of attention to the left or right visual hemifield in anticipation of an imperative stimulus requiring discrimination. In addition to behavioral measures, we examined overall, tonic attentional focus as well as phasic, cue-dependent anticipatory attentional biasing, as indexed by scalp-recorded alpha-band (8-14 Hz) activity. We found an increase in hit rate and target discriminability (d') for the combined treatment relative to placebo, and an increase in d' but not hit rate for caffeine alone, whereas no effects were detected for L-theanine alone. Electrophysiological results did not show increased differential biasing in phasic alpha across hemifields but showed lower overall tonic alpha power in the combined treatment, similar to previous findings at a larger dosage of L-theanine alone. This may signify a more generalized tonic deployment of attentional resources to the visual modality and may underlie the facilitated behavioral performance on the combined ingestion of these 2 major constituents of tea.

This study was conducted to better understand why socially anxious individuals experience less sexual satisfaction in their intimate partnerships than nonanxious individuals, a relationship that has been well documented in previous research. Effective communication between partners is an important predictor of relationship satisfaction. Sexual communication, an important aspect of communication between romantic partners, is especially sensitive for couples given the vulnerability inherent in being open about sexual issues. Because socially anxious individuals characteristically report fear of evaluation or scrutiny by others, we hypothesized that the process of building intimacy by sharing personal information about oneself with one's partner, including when this information relates to one's sexuality and/or the sexual domain of the relationship, would be particularly difficult for socially anxious individuals. The present study examined fear of intimacy and sexual communication as potential mediators of the relationship between higher social anxiety and lower sexual satisfaction. Self-report data were collected from 115 undergraduate students and their partners in monogamous, heterosexual, committed relationships of at least 3 months duration. Multilevel path modeling revealed that higher social anxiety predicted higher fear of intimacy, which predicted lower satisfaction with open sexual communication, which, in turn, predicted lower sexual satisfaction. Additionally, there was evidence of mediation as there were significant indirect effects of the antecedent variables on sexual satisfaction. The path model had excellent fit. Implications for social anxiety, intimate relationships, and couples therapy are discussed.

This study examined the impact of general and sexual communication on couples' overall and sexual satisfaction. Data were collected from 116 heterosexual, monogamous couples in relationships of at least three months' duration. Open sexual communication accounted for unique variance in both sexual and overall relationship satisfaction; general communication effectiveness did so only for overall satisfaction.