Snowball sampling, as a network research, has number of advantages in registering “hidden populations”, such as: people with rare diseases and unrecognized by the community, illegal immigrants, drug users, deviant sexual behavior, undeclared workers, alcoholics, gambling or computer addicts, unemployed jobseekers, domestic school violence, etc. The procedure is well known widely applied, are it...

Social play is a frequent behaviour in great apes and involves sophisticated forms of communicative exchange. While it is well established that great apes test and practise the majority of their gestural signals during play interactions, the influence of demographic factors and kin relationships between the interactants on the form and variability of gestures are relatively little understood. W...

OBJECTIVE To compare 2 screening methods for unrecognized handicapping hearing loss in the elderly. STUDY DESIGN Cross-sectional study. POPULATION Five hundred forty-six older individuals who underwent audiometry at biennial examination 22 of the Framingham Heart Study and who took the Hearing Handicap Inventory for the Elderly-Screening (HHIE-S) questionnaire. OUTCOMES MEASURED The 2 scr...

Drawing on theorizing and research suggesting that people are motivated to view their world as an orderly and predictable place in which people get what they deserve, the authors proposed that (a) random and uncontrollable bad outcomes will lower self-esteem and (b) this, in turn, will lead to the adoption of self-defeating beliefs and behaviors. Four experiments demonstrated that participants ...

Objectives: To examine the influence of perceptions of the motivational climate, self-efficacy, and perceived importance on athletes’ claimed situational self-handicaps in a competitive sport setting. Perceptions of a task involving climate and self-efficacy were expected to be negatively related and perceptions of an ego-involving climate to be positively related to situational self-handicappi...

This paper reports on the use of carrot (positive) and stick (negative) incentives as methods of increasing effort among members of work teams. We study teams of four members in a laboratory environment in which giving effort towards the team goal is simulated by eliciting voluntary contributions towards the provision of a public good. We test the efficiencyimproving properties of four distinct...

【キーワード】Self-esteem, Bayesian learning, Tradeoff between risk and incentives, Contract 【要約】It is widely accepted in social psychology that the need to maintain and enhance self-esteem is a fundamental human motive. We incorporate this factor into an otherwise ordinary principal-agent framework and examine its impact on the optimal incentive scheme and the agent's behavior, especially focusing on...