The influence of spatial pattern on visual short-term memory for contrast

Several psychophysical studies of visual short-term memory (VSTM) have shown high-fidelity storage capacity for many properties of visual stimuli. On judgments of the spatial frequency of gratings, for example, discrimination performance does not decrease significantly, even for memory intervals of up to 30 s. For other properties, such as stimulus orientation and contrast, however, such “perfect storage” behavior is not found, although the reasons for this difference remain unresolved. Here, we report two experiments in which we investigated the nature of the representation of stimulus contrast in VSTM using spatially complex, two-dimensional random-noise stimuli. We addressed whether information about contrast per se is retained during the memory interval by using a test stimulus with the same spatial structure but either the same or the opposite local contrast polarity, with respect to the comparison (i.e., remembered) stimulus. We found that discrimination thresholds got steadily worse with increasing duration of the memory interval. Furthermore, performance was better when the test and comparison stimuli had the same local contrast polarity than when they were contrast-reversed. Finally, when a noise mask was introduced during the memory interval, its disruptive effect was maximal when the spatial configuration of its constituent elements was uncorrelated with those of the comparison and test stimuli. These results suggest that VSTM for contrast is closely tied to the spatial configuration of stimuli and is not transformed into a more abstract representation.     

A Perennial Illusion? Wittgenstein,Quentin Skinner's Contextualism and the Possibility of Refuting Past Philosophers

Contemporary philosophers often purport to ‘borrow’ or ‘refute’ claims made by past philosophers. In doing so they contravene a contextualist methodological prohibition once defended by Quentin Skinner in his seminal paper “Meaning and Understanding in the History of Ideas”. Skinner's methodology has been much debated by theorists of textual meaning and interpretation, and yet the precise nature of the logical path from his premises to his prohibitory conclusion remains elusive. This paper seeks to refute two of the most promising variants of an argument for his methodological prohibition on ‘refutation’, one of which draws on his appeal to Wittgenstein's conception of ‘meaning as use’, and the other of which draws on his appeal to speech act theory.     

Environmental Correlates of Adolescent’ Materialism: Interpersonal Role Models,Media Exposure,and Family Socio-economic Status

Journal of Child and Family Studies - The present study examined how adolescents’ materialism relates to interpersonal materialism role models (i.e., mothers’, fathers’,...     

Eyetracking for two-person tasks with manipulation of a virtual world

Eyetracking facilities are typically restricted to monitoring a single person viewing static images or prerecorded video. In the present article, we describe a system that makes it possible to study visual attention in coordination with other activity during joint action. The software links two eyetracking systems in parallel and provides an on-screen task. By locating eye movements against dynamic screen regions, it permits automatic tracking of moving on-screen objects. Using existing SR technology, the system can also cross-project each participant’s eyetrack and mouse location onto the other’s on-screen work space. Keeping a complete record of eyetrack and on-screen events in the same format as subsequent human coding, the system permits the analysis of multiple modalities. The software offers new approaches to spontaneous multimodal communication: joint action and joint attention. These capacities are demonstrated using an experimental paradigm for cooperative on-screen assembly of a two-dimensional model. The software is available under an open source license.     

Attentional and interpretative biases in appearance concern: An investigation of biases in appearance-related information processing

The present study examined associations between high levels of appearance concern and information processing biases in interpretation and attention. An opportunity sample (N = 79) categorised ambiguous stimuli as related or unrelated to appearance. Participants then responded to the same stimuli in a modified visual dot-probe task assessing attentional bias. Participant responses were assessed in relation to level of appearance concern. The results indicated a valence specific bias towards interpretation of ambiguous stimuli as negative and appearance-related in individuals with higher levels of concern. There was also evidence of attentional bias towards information perceived as appearance-related in participants with higher levels of appearance concern. The study findings suggest that association between appearance-orientated information processing biases and level of appearance concern; this association may lead to mutually reinforcing bias and concern.     

The Behavioral Logic of Collective Action: Partisans Cooperate and Punish More Than Nonpartisans

Laboratory experiments indicate that many people willingly contribute to public goods and punish free riders at a personal cost. We hypothesize that these individuals, called strong reciprocators, allow political parties to overcome collective action problems, thereby allowing those organizations to compete for scarce resources and to produce public goods for like‐minded individuals. Using a series of laboratory games, we examine whether partisans contribute to public goods and punish free riders at a greater rate than nonpartisans. The results show that partisans are more likely than nonpartisans to contribute to public goods and to engage in costly punishment. Given the broad theoretical literature on altruistic punishment and group selection as well as our own formal evolutionary model, we hypothesize that it is being a partisan that makes an individual more likely to be a strong reciprocator and not vice versa.     

Efficacy of the Health Belief Model for Predicting Intention to Pursue Genetic Testing for Colorectal Cancer

This study examined the Health Belief Model’s efficacy to predict intention to undergo genetic testing for the Colorectal Carcinoma (CRC) gene within a rural/frontier setting. Survey data were collected on 558 Southwest Montanan residents. Regression analysis revealed that perceived benefits, including affordability and satisfying curiosity, were the strongest indicators of intention to undergo genetic testing for CRC. Select consumer barriers and cues to action variables were also found to be significant predictors. Collectively the model explained approximately 36% of the variance. These preliminary findings have implications for genetic counselors, health practitioners and health care providers concerned with genetic counseling and addressing the public health issue of CRC.     

Animalism and the varieties of conjoined twinning

We defend the view that we are not identical to organisms against the objection that it implies that there are two subjects of every conscious state one experiences: oneself and one’s organism. We then criticize animalism—the view that each of us is identical to a human organism—by showing that it has unacceptable implications for a range of actual and hypothetical cases of conjoined twinning: dicephalus, craniopagus parasiticus, and cephalopagus.     

Constraining or Constructive? The Effects of Examples on Idea Novelty

The tendency to conform to prior examples can be viewed as a form of mental fixation that has negative consequences and limits the scope and quality of designs. Two experiments using the Smith, S. M., Ward, T. B., & Schumacher, J. S. [(1993) Memory & Cognition, 21, 837‐845] toy invention task were conducted to determine whether participants who viewed example toys would subsequently generate toys rated as less novel compared to a control group viewing no examples. Although participants who viewed examples tended to incorporate the example features into their own ideas, the novelty of their ideas was rated as higher than those of the control group. This effect occurred both with no specific instruction regarding the examples (Experiment 1), as well as when specifically instructed to be different from the examples (Experiment 2). These results indicate that examples do not always have a negative impact on creativity, and suggest they may sometimes help lead to more unusual ideas.