Working memory training improves visual short-term memory capacity

Since antiquity, philosophers, theologians, and scientists have been interested in human memory. However, researchers today are still working to understand the capabilities, boundaries, and architecture. While the storage capabilities of long-term memory are seemingly unlimited (Bahrick, J Exp Psychol 113:1–2, 1984), working memory, or the ability to maintain and manipulate information held in memory, seems to have stringent capacity limits (e.g., Cowan, Behav Brain Sci 24:87–185, 2001). Individual differences, however, do exist and these differences can often predict performance on a wide variety of tasks (cf. Engle What is working-memory capacity? 297–314, 2001). Recently, researchers have promoted the enticing possibility that simple behavioral training can expand the limits of working memory which indeed may also lead to improvements on other cognitive processes as well (cf. Morrison and Chein, Psychol Bull Rev 18:46–60 2011). However, initial investigations across a wide variety of cognitive functions have produced mixed results regarding the transferability of training-related improvements. Across two experiments, the present research focuses on the benefit of working memory training on visual short-term memory capacity—a cognitive process that has received little attention in the training literature. Data reveal training-related improvement of global measures of visual short-term memory as well as of measures of the independent sub-processes that contribute to capacity (Awh et al., Psychol Sci 18(7):622–628, 2007). These results suggest that the ability to inhibit irrelevant information within and between trials is enhanced via n-back training allowing for selective improvement on untrained tasks. Additionally, we highlight a potential limitation of the standard adaptive training procedure and propose a modified design to ensure variability in the training environment.     

Charting the map metaphor in theories of religion

The idea that scholars of religion produce ‘maps’ that represent the ‘territories’ of religion(s) is common and influential. This paper first discusses the role of the metaphor, with special reference to the work of J.Z. Smith, and some of the problems raised by the map metaphor (above all, its implicit reliance on a naive correspondence view of truth). It then draws two important distinctions: between different levels of representation; and between the representing and guiding function of maps (truth and use). It ends by comparing issues in the philosophy of science and the theory of religion in order to highlight some promising directions for more defensible semantic and epistemological groundwork in theory of religion.     

Disturbance cues function as a background risk cue but not as an associative learning cue in tadpoles

Animal Cognition - Chemical information has an important role in the sensory ecology of aquatic species. For aquatic prey, chemical cues are a vital source of information related to predator...     

A cross-modal effect of noise: the disappearance of the alarm reaction of a freshwater fish

Anthropogenic noise pollution is recognized as a major global stressor of animals. While many studies have assessed the unimodal impacts of noise pollution with a focus on intraspecific acoustic communication, little is known about noise pollution on the perception of visual and chemical information. The ‘distracted prey hypothesis’ posits that processing noise interferes with processing other information in the brain. Here, we found evidence for such a cross-modal effect of noise on the antipredator behaviour of a freshwater prey fish, the fathead minnow, Pimephales promelas. In laboratory trials, exposure to noise from a motorboat caused the total absence of the classical fright reaction of minnows to conspecific alarm cues, whereas an ambient noise control had no such impact. In natural habitats, the impairment of such antipredator behaviour due to noise pollution could have major fitness consequences. We discuss how our findings translate to animal ecology and the need for future studies that target specific management decisions regarding noise pollution.     

Hemifacial differences in the in‐group advantage in emotion recognition

Some researchers have interpreted findings of in‐group advantage in emotion judgements as ethnic bias by perceivers. This study is the first linking in‐group advantage to subtle differences in emotional expressions, using composites created with left and right facial hemispheres. Participants from the USA, India, and Japan judged facial expressions from all three cultures. As predicted, in‐group advantage was greater for left than right hemifacial composites. Left composites were not universally more recognisable, but relatively more recognisable to in‐group members only. There was greater pancultural agreement about the recognition levels of right hemifacial composites. This suggests the left facial hemisphere uses an expressive style less universal and more culturally specific than the right, and that bias alone does not cause the in‐group advantage.