The Role of the Hippocampus in Trace Conditioning: Temporal Discontinuity or Task Difficulty?

It is well established that the hippocampal formation is critically involved in the acquisition of trace memories, a paradigm in which the conditioned (CS) and unconditioned stimuli (US) are separated by a temporal gap (Solomon et al., 1986). The structure is reportedly not critical for the acquisition of delay memories, where the CS and the US overlap in time (Berger & Orr, 1983; Schmaltz & Theios, 1972). Based on these results, it is often stated that the hippocampus is involved in "filling the gap" or otherwise associating the two stimuli in time. However, in addition to the presence of a temporal gap, there are other differences between trace and delay conditioning. The most apparent difference is that animals require many more trials to learn the trace task, and thus it is inherently more difficult than the delay task. Here, we tested whether the hippocampus was critically involved in delay conditioning, if it was rendered more difficult such that the rate of acquisition was shifted to be analogous to trace conditioning. Groups of rats received excitotoxic lesions to the hippocampus, sham lesions or were left intact. Using the same interstimulus intervals (ISI), control animals required more trials to acquire the trace than the delay task. As predicted, animals with hippocampal lesions were impaired during trace conditioning but not delay conditioning. However, when the delay task was rendered more difficult by extending the ISI (a long delay task), animals with hippocampal lesions were impaired. In addition, once the lesioned animal learned the association between the CS and the US during delay conditioning, it could learn and perform the trace CR. Thus, the role of the hippocampus in classical conditioning is not limited to learning about discontiguous events in time and space; rather the structure can become engaged simply as a function of task difficulty.     

The latent structure of posttraumatic stress disorder: Different models or different populations?

Factor analytic studies of the structure of self-reported posttraumatic stress disorder (PTSD) symptoms have consistently supported two 4-factor models; the "Dysphoria" and the "Emotional Numbing" model. The fit of both models has been satisfactory; however, it has been difficult to unequivocally determine which model is best. This study aimed to test the hypothesis that there is no single "correct" model, but rather that the models represent different subpopulations. A confirmatory factor 2-class mixture model was specified with the Dysphoria model in one class and the Emotional Numbing model in the other. This model was tested using data from participants from 4 trauma groups. This model fitted the data better than 1 and 2-class models of the Dysphoria, Emotional Numbing, and cross-factor loading model. It was concluded that the search for the "correct" model of PTSD based on the assumption of a single homogenous population may not be a worthwhile research endeavor. (PsycINFO Database Record (c) 2012 APA, all rights reserved).     

The Effect of Comparative Advertising on Consumer Perceptions: Similarity or Differentiation?

Purpose  

Comparative advertising is seen as an effective means of conveying the differentiating advantages of a brand. Nevertheless, several studies show that a primary effect of comparative advertising is to lead consumers to associate the advertised brand with the competitor brand identified within the ad: it seems that comparison generates perceived similarity among brands instead of differentiation, per se. In order to clarify the issue, the aim of the research is to investigate the relative effectiveness of comparative and non-comparative advertising in communicating the differentiating attributes of a brand.     

The Conjunction Effect: Fallacy or Bayesian Inference?

It has been suggested by Wolford, Taylor, and Beck (1990) that the conjunction fallacy is not really a fallacy at all but arises when individuals misconstrue the judgmental problem providing estimates of the kind P(X|A&B) or P(X|B) (reverse probabilities) instead of the actual quantities that are being sought by the experimenter: P(A&B|X) or P(B|X). As pointed out by Wolford and co-workers, while the following judgment, P(A&B|X) > P(B|X), is a violation of the conjunction rule, outcomes such as P(X|A&B) > P(X|B) do not necessarily violate any probabilistic law. In an attempt to de-bias the judgment process, in Study 1 participants were requested to provide both types of probabilities at the same time. The results revealed a drop in the incidence of the conjunction fallacy to 32% averaged over all scenarios compared with 57% for the same scenarios in an earlier study. In each scenario the two sets of estimates, normal and reverse, were significantly different from each other indicating that participants were capable of distinguishing between the two concepts. Despite this fact in two of the four scenarios a significant minority of participants (44 and 49%) continued to commit the fallacy. These combined outcomes cast doubt on Wolfordet al.’s (1990) account of the fallacy. In addition, Studies 2 and 3 showed that under certain conditions, most participants’ judgments of the kind P(X|A&B) > P(X|B), far from being normative, were inconsistent with Bayes’ theorem even in broad terms.     

Retrospective Revaluation and Inhibitory Associations: Does Perceptual Learning Modulate our Perception of the Contingencies Between Events?

The reported experiments seek to reconcile the conflict between proposed explanations of retrospective revaluation of contingency judgements in experiments with humans (e.g. Dickinson & Burke, 1996) and those of a perceptual learning phenomenon discovered in rats (Espinet, Iraola, Bennett, &Mackintosh, 1995). The experiments employ a medical diagnosis scenario, in which subjects are asked to judge whether particular symptoms signal the presence or absence of a fictitious disease. In Experiment 1, following alternating exposure to pairs of symptoms, AX and BX, subjects were informed that symptom A was predictive of illness. As a result of this training, subjects rated symptom B as predictive of the absence of the illness. In Experiment 2, a possible mechanism behind this effect was considered. In particular, it was established that pre-exposure in which the AX pair reliably preceded the BX pair produced the same pattern of results as those shown in Experiment 1. In contrast, when the order of pairs was reversed, so that BX reliably preceded AX, the reduction in ratings for symptom B was not obtained. Several extant associative theories are discussed, but none are found to account adequately for this pattern of results. To overcome these inadequacies, a parsimonious theory is suggested that explains all the effects observed in these experiments.     

Individuality or Conformity? The Effect of Independent and Interdependent Self-Concepts on Public Judgments

When both independent and interdependent self‐concepts are available, priming either self‐concept will increase the accessibility in memory of the motivations and cognitions associated with it. Thus, priming the interdependent self may activate motivation to maintain harmony and conform to others’ opinions, whereas priming the independent self is likely to activate motivation to be independent and to withstand social pressure. Two experiments investigated implications of these possibilities for judgments of risk when participants anticipated (or not) explaining their judgments to others. Participants relied on others’ beliefs only when their interdependent self was primed and they expected they might have to explain their judgments to others. When their independent self was primed, expectations to communicate theirjudgments had no effect. Culture‐based differences in individualism vs. collectivism had no impact on these effects.     

The Effect of Bilingualism and Trilingualism on Metacognitive Processing: Detrimental or Beneficial?

Research in multilingualism has shown that bilinguals have enhanced executive function (e.g., Donnelly et al. in Proceedings of the 37th annual conference of the cognitive science society 2015; Green in Bilingualism Lang Cognit 1(02):67–81, 1998.  https://doi.org/10.1017/S1366728998000133); however, this with many other areas in multilingualism have been questioned like their non-verbal reasoning or their metacognitive ability. This study attempts to explore learning more than one languages in the field of metacognitive abilities. Three groups of monolinguals, bilinguals, and trilinguals were explored to examine the effect of language learning on enhancing or weakening accuracy and response time in metacognitive processing. Conducting dot discrimination task, we found that multilingualism might have some advantages in this field. As cognition and metacognitive abilities demonstrated no positive correlation in this study, we might conclude that executive functioning can not bring about higher order functioning for the individuals. Nevertheless, monolinguals did the task in the least period of time with the least accuracy. Trilinguals, on the contrary, could respond more accurately with an average speed. Accuracy, difficulty, and response time choice in metacognitive processing were discussed for each group. It is concluded that multilingualism might have different effects on higher-order decision making abilities.     

The Combined Effect of the Severity and the Certainty of Threatened Penalties: Additive or Interactive?

Research carried out to date has yielded inconsistent results regarding the manner in which the severity and certainty of threatened penalties combine to affect deterrence. While some studies presented evidence showing an interactive combination, others yielded an additive pattern. The present study tested and supported the proposition that the process whereby the two variables combine depends on the type of penalty with which a person is threatened. In the case of penalties the severity of which can be psychologically weighed in interval values, the combined effect is multiplicative or interactive. On the other hand, when the severity of a penalty can be expressed only ordinally, the combined effect is largely additive.     

The Question of the Holocaust's Uniqueness: Was it Something More Than or Different From Genocide?

Dating back to the very beginning of our knowledge of the events that constituted the Holocaust, some historians, social scientists, philosophers, theologians and public intellectuals argue that it was a unique historical, or even trans‐historical, event. The aim of this article is to clarify what the uniqueness question should be about and to ascertain whether there are good reasons for judging that the Holocaust is unique. It examines the core meanings of ‘unique’ that feature in the literature and identifies which of these is most apt for considering the possible uniqueness of the Holocaust. It then works out what it would take for the Holocaust to be unique in the appropriately rigorous sense, which is facilitated by inquiring into the nature of genocide. The key question turns on the relation of the Holocaust to genocide: was the Holocaust more than, or different from, genocide?     

Are Automatic Imitation and Spatial Compatibility Mediated by Different Processes?

Automatic imitation or “imitative compatibility” is thought to be mediated by the mirror neuron system and to be a laboratory model of the motor mimicry that occurs spontaneously in naturalistic social interaction. Imitative compatibility and spatial compatibility effects are known to depend on different stimulus dimensions—body movement topography and relative spatial position. However, it is not yet clear whether these two types of stimulus–response compatibility effect are mediated by the same or different cognitive processes. We present an interactive activation model of imitative and spatial compatibility, based on a dual‐route architecture, which substantiates the view they are mediated by processes of the same kind. The model, which is in many ways a standard application of the interactive activation approach, simulates all key results of a recent study by Catmur and Heyes (2011) . Specifically, it captures the difference in the relative size of imitative and spatial compatibility effects; the lack of interaction when the imperative and irrelevant stimuli are presented simultaneously; the relative speed of responses in a quintile analysis when the imperative and irrelevant stimuli are presented simultaneously; and the different time courses of the compatibility effects when the imperative and irrelevant stimuli are presented asynchronously.     

Is the Effect of Behavioral Synchrony on Cooperative Behavior Mediated by Pain Threshold?

Synchronized behavior results in a variety of prosocial behaviors. Research has also implicated that interpersonal synchrony affects pain thresholds, inferred as indicative of endorphin levels. The current study was designed to see if these pain threshold effects mediated the effect of synchrony on interpersonal cooperation. Twenty six individuals were randomly assigned to complete a 30 minute run on a treadmill in either a synchronized or nonsynchronized condition. Pain threshold was measured both before and after exercise as an indicator of endorphin activity. A postrun social investment game measured interpersonal cooperation. Analyses showed that there was a significant direct relationship between condition and cooperation but that this effect was not mediated by pain threshold.     

Personality or Role? Comparisons of Turkish Leaders Across Different Institutional Positions

Personality approaches to politics are often criticized for not examining the effect that institutional role constraints have on individual beliefs and preferences. When leaders appear to change their stance when they change roles, it is assumed that roles have a determining influence. Modern personality theory and contemporary sociological role theory, however, view the effects of roles as interacting with agents’ personalities. In this article, we investigate this question by comparing personality profiles of three Turkish leaders (Özal, Demirel, and Gül) during their tenure as prime minister and during their subsequent time as president. For Gül, we perform an additional comparison during his time as foreign minister. The personality profiles are in the form of quantitative scores generated from machine‐coded content analysis of leaders’ words using the Leadership Trait Analysis method. We hypothesize that different leaders will be more susceptible to changing role contexts, depending on core personality traits, and that different traits are more likely to change with new roles. Overall, our results suggest that leaders’ traits are fairly resistant to changes across roles and that task orientation is the most likely trait to change as leaders adapt to different role demands and expectations. This study makes a contribution to our understanding of the interaction between personality and political contexts by offering specific theoretically derived hypotheses and by empirically and statistically examining a preliminary set of expectations that could be applied more broadly to other leaders.     

Partial information or facilitation? Different interpretations of results from speed-accuracy decomposition

The speed-accuracy decomposition technique was developed by Meyer, Irwin, Osman, and Kounios (1988) to examine the time course of information processing. The technique allows for the estimation of the accuracy of guesses that are induced by the presentation of a response signal on a proportion of trials. Estimated guessing accuracy has been found to be above chance and to increase as time of guessing increases, suggesting that guesses are based on partial information that has accumulated prior to a response decision (sophisticated guesses). In this paper, a different interpretation of these data is presented. Results suggest that response signals may enhance the speed of regular processes, thereby violating the temporal-independence assumption that underlies the decomposition technique. As shown by Monte Carlo simulations, such facilitating effects of response signals can explain the results from the decomposition technique at least in part and possibly in full, even when guesses are actually at chance accuracy (pure guesses). The pure-guess model was supported by the results from an experiment designed to test between the alternative interpretations. These results point to the need for great caution in the attempt to infer the time course of information processing from guessing accuracies as estimated by the speed-accuracy decomposition technique.     

The Effect of Positive Emotions with Different Arousal Levels on Thought–Action Repertoires1,2

This study examined whether the induction of different states of arousal via positive emotions broadens thought–action repertoires. Sixty-two Japanese undergraduate and graduate students were randomly assigned to (a) high-arousal positive emotion, (b) low-arousal positive emotion, and (c) neutral groups, after which they watched a 3-min film clip. Participants completed the Affect Grid to confirm their mood state before and after watching the film. Following this, they completed the Twenty Statements Test, which measures thought–action repertoires. A one-way analysis of variance was conducted on the Twenty Statements Test score. The results showed that high-arousal positive emotion broadened thought–action repertoires to a greater extent than did low-arousal positive emotion and the neutral state, while low-arousal positive emotion broadened such repertoires to a greater extent than did the neutral state. We discuss the different effects of high- and low-arousal positive emotions on thought–action repertoires.     

Why Do We Like the iPhone? The Role of Evaluative Conditioning in Attitude Formation

Evaluative conditioning (EC) is the change in liking due to the paring of an affectively meaningful and a neutral stimulus. Starting with the exemplary question of why we like the iPhone, this article provides an overview of past and present research and gives an outlook to future research on this topic. We outline four different theoretical EC accounts and discuss how each account is consistent with current empirical evidence.     

The Role of Gender Identification in Social Dominance Orientation: Mediating or Moderating the Effect of Sex?1

Previous research has shown that people's gender identification correlates with their social dominance orientation (SDO). A question is whether gender identification mediates or moderates the effect of biological sex on SDO. We examined the correlations of sex and gender identification with SDO using the Bem Sex Role Inventory in Study 1 and a gender diagnostic measure in Study 2. Both studies showed that gender identification was significantly associated with SDO. In Study 1, gender identification partially mediated the effect of sex on SDO; and in Study 2, this mediation was complete. There were no indications that gender identification moderated the effect of sex on SDO. The results are discussed against the background of the gender invariance hypothesis of SDO.