VSearch Color: Full-color visual search experiments on the Macintosh II

We describe an update to our visual search software for the Macintosh line of computers. The new software, VSearch Color, gives users access to the full-color capabilites of the Macintosh II line. One of the key features of the new software is its ability to treat graphics information separately from color information. This makes it easy to study color independently of form, to design experiments based on isoluminant stimuli, and to incorporate texture segregation, visual identification, number discrimination, adaptation, masking, and spatial cuing into the basic visual search paradigm.     

THE FORMATION OF VISUAL STIMULUS EQUIVALENCES IN CHILDREN

Four normal children were presented a series of matching-to-sample tasks, using five sets of visual stimuli designated A, B, C, D, and E. Stimulus equivalences were established by matching stimuli from one set to those from another set. Each set consisted of three stimuli, so matching set A to set D meant that each stimulus in set A served as a sample with all three stimuli in set D as comparisons. Subjects were first taught AD and DC matching and were then able to perform AC/CA matching without additional training. After ED was taught directly, CE/EC and AE/EA performances emerged. Following CB training, three new equivalences were demonstrated: AB/BA, EB/BE, and DB/BD. Oral naming of each stimulus showed that subjects had not assigned a common label to stimuli in the same class, indicating that naming is not necessary for the formation of stimulus equivalences. The absence of response mediation suggests that matching to sample can form direct stimulus-stimulus associations. The data also provide support for the notion that generative performances are outcomes of existing stimulus-control relationships.     

Validity of the Woodcock-Johnson tests of achievement for learning-disabled students

Two independent samples of 40 and 32 elementary-aged, learning-disabled (LD) pupils were administered the Woodcock-Johnson Tests of Achievement (WJTA), the Peabody Individual Achievement Test (PIAT), and the Wide Range Achievement Test (WRAT) following seven instructional months in an LD self-contained class. Concurrent validity coefficients between W-J achievement clusters and corresponding WRAT and PIAT subtests ranged between .64 and .93. Results from both samples were convergent, thus allowing corroboration of findings. Discrepancies among WJTA, WRAT, and PIAT grade equivalents and standard scores are discussed, as are possible limitations of the WJTA for use with learning disabled pupils.     

How chance explains

What explains the outcomes of chance processes? We claim that their setups do. Chances, we think, mediate these explanations of outcome by setup but do not feature in them. Facts about chances do feature in explanations of a different kind: higher-order explanations, which explain how and why setups explain their outcomes. In this paper, we elucidate this 'mediator view' of chancy explanation and defend it from a series of objections. We then show how it changes the playing field in four metaphysical disputes concerning chance. First, it makes it more plausible that even low chances can have explanatory power. Second, it undercuts a circularity objection against reductionist theories of chance. Third, it redirects the debate about a prominent argument against epistemic theories of chance. Finally, it sheds light on potential chancy explanations of the Universe's origin.     

The effect of repeated testing on judgement bias in domestic dogs (Canis familiaris)

Animal Cognition - Judgement bias paradigms are increasingly being used as a measure of affective state in dogs. Approach to an ambiguous stimulus is commonly used as a measure of affect, however,...     

Does partisan media make a pawn of mistrust? Institutional trust and preventive COVID-19 health behaviors in a polarized pandemic

In a rapidly developing crisis such as the COVID-19 pandemic, people are often faced with contradictory or changing information and must determine what sources to trust. Across five time points (N = 5902) we examine how trust in various sources predicts COVID-19 health behaviors. Trust in experts and national news predicted more engagement with most health behaviors from April 2020 to March 2022 and trust in Fox news, which often positioned itself as counter to the mainstream on COVID-19, predicted less engagement. However, we also examined a particular public health behavior (masking) before and after the CDC announcement recommending masks on 3 April 2020 (which reversed earlier expert advice discouraging masks for the general public). Prior to the announcement, trust in experts predicted less mask-wearing while trust in Fox News predicted more. These relationships disappeared in the next 4 days following the announcement and reversed in the 2 years that follow, and emerged for vaccination in the later time points. We also examine how the media trusted by Democrats and Republicans predicts trust in experts and in turn health behaviors. Broadly we consider how the increasingly fragmented epistemic environment has implications for polarization on matters of public health.     

Race,Religion, and Black Lives Matter: Assessing the Association between Sermon Content and Racial Justice Attitudes and Behaviors

We use the 2020/2021 National Politics Study to examine two central questions: 1. How do religious beliefs and clergy sermons about race associate with support for Black Lives Matter (BLM) and racial justice work? And 2. Is the relationship between religion and BLM-related attitudes and activism similar or different across race groups? We found the following: In the months following the summer of 2020 protests in response to George Floyd's murder, African, Hispanic, and White American worship goers who heard sermons about race and policing were more likely than were their co-ethnics to approve of BLM and to engage in racial justice work. Identifying with the religious left and believing that social justice is a core part of one's religaious beliefs is also associated with these groups approving of BLM and engaging in racial justice work. That said, race matters. These forms of religion tend to maintain stronger relationships with White BLM-related attitudes and activism than they do for African Americans and Hispanics.