Consumer behavior offers a useful window on human nature, through which many distinctively human patterns of cognition and behavior can be observed. Consumer behavior should therefore be of central interest to a broad range of psychologists. These patterns include much of what is commonly understood as free will. Our approach to understanding free will sidesteps metaphysical and theological debates. Belief in free will is pervasive in human social life and contributes to its benefits. Evolution endowed humans with a new form of action control, which is what people understand by free will. Its complexity and flexibility are suited to the distinctively human forms of social life in culture, with its abstract rules, expanded time span, diverse interdependent roles, and other sources of opportunities and constraints. Self-control, planful action, and rational choice are vital forms of free will in this sense. The capacity for self-control and intelligent decision making involves a common, limited resource that uses the body's basic energy supply. When this resource is depleted, self-control fails and decision making is impaired.

No abstract

Although a relationship between morphological awareness and vocabulary has been widely observed, questions remain about the direction of that relationship. This longitudinal study explores the temporal relationship between morphological awareness and vocabulary among monolingual English-speaking children. Participants were 100 children tested in Grades 2 and 3. We evaluated morphological awareness and vocabulary in both grades, along with phonological awareness, word reading, pseudoword reading, and nonverbal reasoning. Cross-lagged regression analyses with autoregressive controls assessed the temporal relationship between morphological awareness and vocabulary; morphological awareness at Grade 2 predicted change in vocabulary between Grades 2 and 3, but vocabulary did not predict change in morphological awareness. The results add to our understanding of the relationship between these two developing skills.

No abstract

Researchers commonly explore their data in multiple ways before deciding which analyses they will include in the final versions of their papers. While this improves the chances of researchers finding publishable results, it introduces an "opportunistic bias," such that the reported relations are stronger or otherwise more supportive of the researcher's theories than they would be without the exploratory process. The magnitudes of opportunistic biases can often be stronger than those of the effects being investigated, leading to invalid conclusions and a lack of clarity in research results. Authors typically do not report their exploratory procedures, so opportunistic biases are very difficult to detect just by reading the final version of a research report. In this article, we explain how a number of accepted research practices can lead to opportunistic biases, discuss the prevalence of these practices in psychology, consider the different effects that opportunistic biases have on psychological science, evaluate the strategies that methodologists have proposed to prevent or correct for the effects of these biases, and introduce an integrated solution to reduce the prevalence and influence of opportunistic biases. The recent prominence of articles discussing questionable research practices both in scientific journals and in the public media underscores the importance of understanding how opportunistic biases are created and how we might undo their effects.