The decision to check in multialternative choices and limited sensitivity to default

Given the rapid proliferation of smartphone applications and data aggregation websites, in many situations people can use decision aids to guide their choices. For example, they may consider whether to use a navigation device to check the fastest route or whether to use a price comparison website to find the cheapest deal. In what circumstances will subjects use a costly comparison decision aid (which I refer to as “checking”) to choose for them? In six studies, I investigate the impact of the number of available alternatives and checking's attractiveness on the decision to check. While at first increasing the attractiveness of checking led to higher checking rates, a further increase in the number of available alternatives (and thus checking's attractiveness) did not increase the checking rate. Surprisingly, even when checking had a 40% higher expected value compared with not checking, the observed checking rate was below 45%, contrary to risk and ambiguity aversion predictions. Furthermore, labeling the checking alternative as the default had no impact on its choice rate. I find large individual differences in decisions to check. Surprisingly, subjects' initial decisions had high predictive power over their subsequent checking rates, even after 100 trials with full feedback. I propose two simple learning models that capture well the aggregated results.     

Decompositions and biplots in three-way correspondence analysis

In this paper correspondence analysis for three-way contingency tables is presented using three-way generalisations of the singular value decomposition. It is shown that in combination with Lancaster's (1951) additive decomposition of interactions in three-way tables, a detailed analysis is possible of the deviations from independence. Finally, biplots are shown to produce powerful graphical representations of the results from three-way correspondence analyses. An example from child development is used to illustrate the theoretical developments.     

Dopamine regulation of human speech and bird song: a critical review

To understand the neural basis of human speech control, extensive research has been done using a variety of methodologies in a range of experimental models. Nevertheless, several critical questions about learned vocal motor control still remain open. One of them is the mechanism(s) by which neurotransmitters, such as dopamine, modulate speech and song production. In this review, we bring together the two fields of investigations of dopamine action on voice control in humans and songbirds, who share similar behavioral and neural mechanisms for speech and song production. While human studies investigating the role of dopamine in speech control are limited to reports in neurological patients, research on dopaminergic modulation of bird song control has recently expanded our views on how this system might be organized. We discuss the parallels between bird song and human speech from the perspective of dopaminergic control as well as outline important differences between these species.     

Reset a task set after five minutes of mindfulness practice

This study aimed to evaluate the impact of a brief mindfulness practice on reducing the carryover effect caused by a previous task set and to determine the mechanism for its effectiveness. Experiment 1 showed that a memorized color interfered with subsequent visual search as a singleton distractor only when color was a defining feature for the search target. In Experiment 2, three interventions (scene-viewing, distraction, and mindfulness practice) were implemented across three groups for five minutes between two blocks; color was relevant to search in the first block and irrelevant in the second. Only the mindfulness group showed a non-significant carryover effect. Experiment 3 demonstrated that the scene-viewing participants continued adopting a suppressive mode of attentional control on a previously distracting color during letter judgment. In contrast, mindfulness practice could reset a task set. Mindfulness practice could enhance concentration in the present moment via reconfiguring the mode of attentional control.     

先前错失选项的数量对不作为惯性的调节机制

在以往涉及不作为惯性的研究中,个体通常只是错失了1个先前选项.本研究旨在考察当之前错失了多个选项后,不作为惯性是否仍会出现,并深入探讨估价和后悔因素在不作为惯性产生或消失中的作用.结果发现,先前错失选项的数量对不作为惯性具有调节作用:当先前只错失了1个选项时,出现了不作为惯性,当先前已错失了两个选项时,不作为惯性消失了.中介分析发现,这一调节作用可被预期后悔所中介.结果表明,预期后悔是导致个体在错失多个选项后不作为惯性消失的主要原因.     

Flexible and inflexible task sets: Asymmetric interference when switching between emotional expression,sex, and age classification of perceived faces

The present study investigated whether the processing characteristics of categorizing emotional facial expressions are different from those of categorizing facial age and sex information. Given that emotions change rapidly, it was hypothesized that processing facial expressions involves a more flexible task set that causes less between-task interference than the task sets involved in processing age or sex of a face. Participants switched between three tasks: categorizing a face as looking happy or angry (emotion task), young or old (age task), and male or female (sex task). Interference between tasks was measured by global interference and response interference. Both measures revealed patterns of asymmetric interference. Global between-task interference was reduced when a task was mixed with the emotion task. Response interference, as measured by congruency effects, was larger for the emotion task than for the nonemotional tasks. The results support the idea that processing emotional facial expression constitutes a more flexible task set that causes less interference (i.e., task-set “inertia”) than processing the age or sex of a face     

Inaction inertia in retirement saving

In retirement saving, many people miss out on early opportunities to save and subsequently fail to take adequate actions for a long time thereafter. We examined whether these two observations—the initial failure to act and the subsequent inertia—could be related through the phenomenon of inaction inertia. In Experiment 1 (N = 180), participants were less likely to save for retirement when the difference in annual return between the current opportunity and the missed opportunity was large versus small. In Experiment 2 (N = 180), participants were less likely to start saving for retirement when reminded of a missed opportunity 10 years ago versus 1 year ago. These data constitute the first demonstration of inaction inertia in retirement saving: People's reluctance to act on attractive saving opportunities may be induced by their previous inaction. In Experiment 3 (N = 340) and Experiment 4 (N = 628), we find that the observed inertia is the product of a tendency to underestimate exponential growth combined with a focus on past opportunities. Building on this mechanism, Experiment 5 (N = 916) provided evidence for a potential remedy; the inaction inertia effect completely disappeared when focus was shifted from required contributions to future outcomes.     

Decoupling the past from the present attenuates inaction inertia

Inaction inertia is the phenomenon that one is not likely to act upon an attractive opportunity after having bypassed an even more attractive opportunity. We investigated the boundary conditions of this inaction inertia effect. Based on the mental accounting literature and the transaction decoupling literature we predicted and found in three experiments that tight coupling of the forgone to the current opportunity is a necessary condition for inaction inertia to occur. Inaction inertia decreased when information about the missed opportunity was ambiguous (Experiment 1), when the past opportunity required an extra step to obtain (Experiment 2) and when the past and present opportunity decreased in comparability (Experiment 3). The theoretical and practical implications of the results are discussed in view of the literature on inaction inertia and on judgment and decision-making. Copyright © 2006 John Wiley & Sons, Ltd.     

替罗非班不同给药途径对DM合并急性STEMI患者PCI术后血小板α-颗粒膜蛋白及心肌灌注水平的影响

为探讨替罗非班不同给药途径对糖尿病（DM）合并急性ST段抬高型心肌梗死（STEMI）患者PCI术后血小板α-颗粒膜蛋白及心肌灌注水平的影响,对149例DM合并急性STEMI患者进行研究,测定并比较经静脉（A组）、冠脉给药途径（B组）和无替罗非班（C组）的患者术前及术中应用替罗非班后血小板α-颗粒膜蛋白GMP140浓度、造影结果、心肌酶及肌钙蛋白I水平峰值及峰值时间、心电图变化。结果显示A、B两组术中血小板α-颗粒膜蛋白浓度较术前明显降低（P〈0．05）,且B组较A组降低更明显（P〈0．05）,而C组未见明显变化（P〉0．05）,A、B两组术后即刻TIMI血流、2h sumSTR、心肌酶及肌钙蛋白Ⅰ峰值及峰值时间的变化均优于C组（P〈0．05）,且B组优于A组（P〈0．05）。因此,替罗非班可以降低血小板α-颗粒膜蛋白浓度和改善心肌灌注水平,与静脉途径给药相比,经冠脉给药更具有优势。     

Emotional inertia: A key to understanding psychotherapy process and outcome

The processes underlying psychotherapeutic change have increasingly been emphasized in both research and clinical practice. Nonlinear dynamical systems theory (NDS) offers a transdisciplinary scientific approach to the study of these processes. This paper introduces the NDS concept of “emotional inertia”, the property of human emotion by which it retains its course so long as it is not acted upon by an external force, as a key to understanding moment-by-moment and also longer-term change processes within psychotherapy. A testable mathematical model of emotional inertia is presented that represents specific impacts of psychotherapeutic processes on emotional dynamics over time. Emotional trajectories in phase space, treatment energy, and the interaction between them are the essential elements of the model, and a detailed explanation is provided. Procedures for testing this model are described, such as by tracking the movement of emotion in phase space within and across therapy sessions, along with clinical implications of the model, which can potentially help to make more clear the complementary roles of therapeutic force, timing, and leverage.