Role of endpoints and closures in feature search1

Abstract: The present study intended to examine the role of endpoints and of closures, the two most frequently referred to features, in a feature‐search paradigm. Two experiments were conducted with a rigorous stimulus control using random lined figures of different levels of complexity. The experiments gave almost identical results: there was no search asymmetry between the two features, smaller latencies were obtained in the presence of a feature as a target rather than in its absence, and the latencies were smaller for the displays having a background consisting of closures rather than for those having a background of endpoints. The results were more comprehensively explained by the high contrast between an endpoint as a target and closures as a background, rather than the conspicuity of an endpoint as a target. The possibility for closures to group into a homogeneous ground was discussed.     

A strategy for assessing closure

This paper looks at an argument strategy for assessing the epistemic closure principle. This is the principle that says knowledge is closed under known entailment; or (roughly) if S knows p and S knows that p entails q, then S knows that q. The strategy in question looks to the individual conditions on knowledge to see if they are closed. According to one conjecture, if all the individual conditions are closed, then so too is knowledge. I give a deductive argument for this conjecture. According to a second conjecture, if one (or more) condition is not closed, then neither is knowledge. I give an inductive argument for this conjecture. In sum, I defend the strategy by defending the claim that knowledge is closed if, and only if, all the conditions on knowledge are closed. After making my case, I look at what this means for the debate over whether knowledge is closed.     

Need for Cognitive Closure and Conservative Political Beliefs: Differential Mediation by Personal Worldviews

The paper investigates the relationships between motivated social cognition (need for cognitive closure), personal worldviews (traditional, modern, or postmodern), and conservative political beliefs. The relationships were analyzed in a sample of 189 Polish adults. High need for closure was associated with support for both traditional and modern worldviews. Although different in content (i.e., endorsing different values and assumptions about the methods and limits of cognition), the worldviews share similar formal characteristics: Both assume the absolute nature of values and the existence of definite truths. However, acceptance of the traditional worldview was related to political conservatism (i.e., support for nationalist and isolationist opinions and a stronger role for traditional, religious values in public life), whereas acceptance of the modern worldview was associated with a rejection of conservative political beliefs. Moreover, personal worldviews mediated the relationship between need for closure and political beliefs: Support for social conservatism was mediated by acceptance of the traditional worldview, whereas acceptance of the modern worldview predicted rejection of conservative values.     

A Model-Based Approach to Understanding Apraxia in Corticobasal Syndrome

Limb apraxia is a neurological disorder of higher cognitive function characterized by an inability to perform purposeful skilled movements and not attributable to an elementary sensorimotor dysfunction or comprehension difficulty. Corticobasal Syndrome (CBS) is an akinetic rigid syndrome with asymmetric onset and progression with at least one basal ganglia feature (rigidity, limb dystonia or myoclonus) and one cortical feature (limb apraxia, alien hand syndrome or cortical sensory loss). Even though limb apraxia is highly prevalent in CBS (70–80%), very few studies have examined the performance of CBS patients on praxis measures in detail. This review aims to (1) briefly summarize the clinical, neuroanatomical and pathological findings in CBS, (2) briefly outline what limb apraxia is and how it is assessed, (3) to comprehensively review the literature on limb apraxia in CBS to date and (4) to briefly summarize the literature on other forms of apraxia, such as limb-kinetic apraxia and buccofacial apraxia. Overall, the goal of the review is to bring a model-based perspective to the findings available in the literature to date on limb apraxia in CBS.     

Fear of self-annihilation and existential uncertainty as predictors of worldview defense: Comparing terror management and uncertainty theories

Terror management theory (TMT) proposes that thoughts of death trigger a concern about self-annihilation that motivates the defense of cultural worldviews. In contrast, uncertainty theorists propose that thoughts of death trigger feelings of uncertainty that motivate worldview defense. University students (N = 414) completed measures of the chronic fear of self-annihilation and existential uncertainty as well as the need for closure. They then evaluated either a meaning threat stimulus or a control stimulus. Consistent with TMT, participants with a high fear of self-annihilation and a high need for closure showed the greatest dislike of the meaning threat stimulus, even after controlling for their existential uncertainty. Contrary to the uncertainty perspective, fear of existential uncertainty showed no significant effects.     

Do you believe what you have been told? Morality and scientific literacy as predictors of pseudoscience susceptibility

The aim of the current study was to examine the antecedents of susceptibility to pseudoscientific information. Participants were asked to assess their perceived probability of and familiarity with statements containing popular science misconceptions and pseudoscientific claims, which were fabricated for the study. Measures of scientific literacy, moral inclinations, need for closure, and a set of additional variables were collected. Analysis of the results showed that susceptibility to known pseudoscientific theories predicted falling for novel unwarranted claims. Scientific literacy strongly predicted lower pseudoscience susceptibility of all types. Finally, participants' moral inclinations were found to be a strong predictor of different types of pseudoscientific statements.     

What do we learn from the Implicit Association Test about intergroup attitudes in Hong Kong? The case of social identification inclusiveness and need for closure

The current study tests an implication of the Associative-Propositional Evaluation model of implicit and explicit attitude measures in Hong Kong's intergroup context. We argued that the Implicit Association Test taps associative intergroup evaluations that are not necessarily consistent with the propositional implications of one's social identification inclusiveness and need for closure. In contrast, explicit intergroup attitude measures tap propositional evaluations resulting from validating the inferences drawn from pertinent propositional information in the evaluation context. Thus, explicit intergroup attitude should be consistent with the propositional implications of social identification inclusiveness and need for closure. We tested and found support for these hypotheses in a study of Hong Kong adolescents' ( N  = 65) perception of Hong Kong people and Mainland Chinese.     

Primate errors in transitive ‘inference’: a two-tier learning model

Transitive performance (TP) is a learning-based behaviour exhibited by a wide range of species, where if a subject has been taught to prefer A when presented with the pair AB but to prefer B when presented with the pair BC, then the subject will also prefer A when presented with the novel pair AC. Most explanations of TP assume that subjects recognize and learn an underlying sequence from observing the training pairs. However, data from squirrel monkeys (Saimiri sciureus) and young children contradict this, showing that when three different items (a triad) are drawn from the sequence, subjects' performance degrades systematically (McGonigle and Chalmers, Nature 267:694-696, 1977; Chalmers and McGonigle, Journal of Experimental Child Psychology 37:355-377, 1984; Harris and McGonigle, The Quarterly Journal of Experimental Psychology 47B:319-348, 1994). We present here the two-tier model, the first learning model of TP which accounts for this systematic performance degradation. Our model assumes primate TP is based on a general-purpose task learning system rather than a special-purpose sequence-learning system. It supports the hypothesis of Heckers et al. (Hippocampus 14:153-162, 2004) that TP is an expression of two separate general learning elements: one for associating actions and contexts, another for prioritising associations when more than one context is present. The two-tier model also provides explanations for why phased training is important for helping subjects learn the initial training pairs and why some subjects fail to do so. It also supports the Harris and McGonigle (The Quarterly Journal of Experimental Psychology 47B:319-348, 1994) explanation of why, once the training pairs have been acquired, subjects perform transitive choice automatically on two-item diads, but not when exposed to triads from the same sequence.     

Militant Islam and Weber’s Social closure: interrelated secular and religious codes of exclusion

Weber’s concept of social closure can help to illuminate the social processes that result in the development of militant Muslim groups. Adapting and applying the concept helps to establish the interrelationships between secular processes and Islamification that are designed by the militants to exclude others and usurp governments. These processes include the implementation of secularisation, conversely concessions to religion and the reinvigoration of Islamic concepts that are used as codes of closure to unite followers and ostracize other Muslims and religious denominations.

Motivation towards closure and cognitive processes: An individual differences approach

Two studies (N = 212) examined the relationships between elementary cognitive processes and individual differences in the need for cognitive closure. The results indicated that the need for closure is linked with certain cognitive deficits, specifically a restricted pool of cognitive resources allocated to a current activity. It was also found that these cognitive limitations tend to be compensated for by a particularly efficient process of information-selection from the environment. However, the selection process is costly, thus in a situation of drainage of cognitive resources its effectiveness also drops and the selection advantage of high (vs. low) need for closure individuals is eliminated.