Hippocampus is required for paired associate memory with neither delay nor trial uniqueness

Cued retrieval of memory is typically examined with delay when testing hippocampal functions, as in delayed matching-to-sample tasks. Equally emphasized in the literature, on the other hand, is the hippocampal involvement in making arbitrary associations. Paired associate memory tasks are widely used for examining this function. However, the two variables (i.e., delay and paired association) were often mixed in paired associate tasks, and this makes it difficult to localize the cognitive source of deficits with hippocampal perturbation. Specifically, a few studies have recently shown that rats can learn arbitrary paired associations between certain locations and nonspatial items (e.g., object or flavor) and later can retrieve the paired location when cued by the item remotely. Such tasks involve both (1) delay between sampling the cue and retrieving the target location and (2) arbitrary association between the cueing object and its paired location. Here, we tested whether delay was necessary in a cued paired associate task by using a task in which no delay existed between object cueing and the choice of its paired associate. Moreover, fixed associative relationships between the cueing objects and their paired locations were repeatedly used, thus involving no trial-unique association. Nevertheless, inactivations of the dorsal hippocampus with muscimol severely disrupted retrieval of paired associates, whereas the same manipulations did not affect discriminating individual objects or locations. The results powerfully demonstrate that the hippocampus is inherently required for retrieving paired associations between objects and places, and that delay and trial uniqueness of the paired associates are not necessarily required.     

Influence of familiar features on diagnosis: instantiated features in an applied setting

Medical diagnosis can be viewed as a categorization task. There are two mechanisms whereby humans make categorical judgments: "analytical reasoning," based on explicit consideration of features and "nonanalytical reasoning," an unconscious holistic process of matching against prior exemplars. However, there is evidence that prior experience can also operate at the level of individual "instantiated" features (Brooks & Hannah, 2006). The present studies examined instantiated features in medical diagnosis. Four "pseudopsychiatric" conditions, each described by four characteristic features, were taught to undergraduate psychology students. They practiced on additional cases, then were tested on new cases with features from two conditions. In Experiment 1, diagnoses associated with familiar features presented one or three times during practice were assigned a higher probability than those with novel features. Experiment 2 showed that the impact of feature frequency was dependent on its consistency with the case diagnosis. Experiment 3 showed that the effect of feature familiarity was not confined to cases with two equiprobable diagnoses. Experiment 4 showed that the effect remained after a 24 hour delay. These four studies demonstrated that features seen in practice have a greater influence on diagnosis than novel synonyms. In fact, seeing a feature once within the appropriate context (a patient case in which it is a member of the primary diagnosis) was sufficient to form a diagnostic association equivalent to instantiations seen four times in a different context. The results of these studies have implications for theories of categorization and for teaching clinical reasoning.     

Explaining the use of text-based communication media: an examination of three theories of media use

The present study examined the factors associated with individuals' use of three different text-based communication media: e-mail, cell-phone texting, and Facebook Wall postings. Three theoretical perspectives, including media richness theory, uses and gratifications, and perceived network effects, were examined. Using data from a survey of college students (N=280), the study found that the theoretical constructs from these theories play different roles when applied to different technologies. The results suggest that a simultaneous consideration of technological attributes, users' motivations, and social circumstances in which users select and use the technology is useful for fully understanding the dynamics of the selection and the use of a given technology.     

The integrated model of smartphone adoption: hedonic and utilitarian value perceptions of smartphones among korean college students

Abstract This study aims to propose an integrated model of smartphone adoption that incorporates social influences (SIs), perceived technicality, as well as hedonic and utilitarian attitudes into the technology acceptance model. The proposed model was empirically evaluated by using survey data collected from 239 Korean college students to investigate their perception and attitudes toward smartphone adoption intention. Our results show that users' attitudes and their adoption intention are highly influenced by SI and positive self-image. This implies that a smartphone is a symbolic product that can signal affiliation and enhance the users' status in a group. The results also indicate that hedonic enjoyment is equally important as utilitarian usefulness in predicting the adoption intention, and the two variables mediate the relationships between SI, positive self-image, perceived technicality, and the intention to use. Consequently, the results reveal that smartphones are convergent media that can be viewed as both task-oriented and entertainment-oriented devices.     

Balancing participation and risks in children's Internet use: the role of internet literacy and parental mediation

This study analyzed the survey data from 566 Korean children between the ages of 10 and 15 to examine the role of Internet literacy and parental mediation in solving the dilemma of children's Internet use. According to the findings, children's online participation was associated with increased exposure to online risks. The association was moderated by Internet skills and parental restrictive mediation; that is, for children with a high level of Internet skills and for children who received more restrictive mediation, the positive association between online participation and online risks weakened, but was still significant. The limited roles of Internet skills and parental restrictive mediation in children's Internet use were discussed in the context of media education.     

Resilience: A Meta‐Analytic Approach

This study investigated the relationship between psychological resilience and its relevant variables by using a meta‐analytic method. The results indicated that the largest effect on resilience was found to stem from the protective factors, a medium effect from risk factors, and the smallest effect from demographic factors.     

Stigma and hostility towards pregnant smokers: Does individuating information reduce the effect?

Australia is at the forefront of tobacco control, yet 17% of Australian women smoke during pregnancy. Negative attitudes to smoking are intensified when the smoker is pregnant, consistent with a discourse that encourages surveillance of pregnant women. Such overt anti-smoking attitudes create a context which may make it difficult for pregnant smokers to seek assistance to stop. However, there is little evidence on the extent to which pregnant smokers are stigmatised by community members. We used vignettes to examine the degree of smoking-related stigma expressed by 595 Australian university students who rated a woman, described as a mother who was smoking or not, and pregnant or not. Further, we examined whether provision of individuating information reduced the degree of stigma. Mothers described as smokers were rated more negatively than those not, particularly if they were pregnant: smokers were perceived as unhealthy, and also as bad mothers. Provision of individuating information slightly reduced these effects. These findings support the view that smokers – particularly if pregnant – are subject to negative moral judgement. Our findings contribute to the ethical debate about stigma-inducing tobacco control efforts, and suggest that anti-smoking campaigns that contextualise smoking in pregnancy might reduce stigma and assist cessation.