Neural correlates of infant accent discrimination: an fNIRS study

The present study investigated the neural correlates of infant discrimination of very similar linguistic varieties (Quebecois and Parisian French) using functional Near InfraRed Spectroscopy. In line with previous behavioral and electrophysiological data, there was no evidence that 3‐month‐olds discriminated the two regional accents, whereas 5‐month‐olds did, with the locus of discrimination in left anterior perisylvian regions. These neuroimaging results suggest that a developing language network relying crucially on left perisylvian cortices sustains infants’ discrimination of similar linguistic varieties within this early period of infancy.     

Sometimes it does hurt to ask: The constructive role of articulating impressions

Decisions can sometimes have a constructive role, so that the act of, for example, choosing one option over another creates a preference for that option (e.g., , ,  and ). In this work we explore the constructive role of just articulating an impression, for a presented visual stimulus, as opposed to making a choice (specifically, the judgments we employ are affective evaluations). Using quantum probability theory, we outline a cognitive model formalizing such a constructive process. We predict a simple interaction, in relation to how a second image is evaluated, following the presentation of a first image, depending on whether there is a rating for the first image or not. The interaction predicted by the quantum model was confirmed across three experiments and a variety of control manipulations. The advantages of using quantum probability theory to model the present results, compared with existing models of sequence order effects in judgment (e.g., Hogarth & Einhorn, 1992) or other theories of constructive processes when a choice is made (e.g.,  and ) are discussed.     

Audition dominates vision in duration perception irrespective of salience,attention, and temporal discriminability

Whereas the visual modality tends to dominate over the auditory modality in bimodal spatial perception, the auditory modality tends to dominate over the visual modality in bimodal temporal perception. Recent results suggest that the visual modality dominates bimodal spatial perception because spatial discriminability is typically greater for the visual than for the auditory modality; accordingly, visual dominance is eliminated or reversed when visual-spatial discriminability is reduced by degrading visual stimuli to be equivalent or inferior to auditory spatial discriminability. Thus, for spatial perception, the modality that provides greater discriminability dominates. Here, we ask whether auditory dominance in duration perception is similarly explained by factors that influence the relative quality of auditory and visual signals. In contrast to the spatial results, the auditory modality dominated over the visual modality in bimodal duration perception even when the auditory signal was clearly weaker, when the auditory signal was ignored (i.e., the visual signal was selectively attended), and when the temporal discriminability was equivalent for the auditory and visual signals. Thus, unlike spatial perception, where the modality carrying more discriminable signals dominates, duration perception seems to be mandatorily linked to auditory processing under most circumstances.     

Does stimulus appearance affect learning?

We examined the learning process with 3 sets of stimuli that have identical symbolic structure but differ in appearance (meaningless letter strings, arrangements of geometric shapes, and sequences of cities). One hypothesis is that the learning process aims to encode symbolic regularity in the same way, largely regardless of appearance. Another is that different types of stimuli bias the learning process to operate in different ways. Using the experimental paradigm of artificial grammar learning, we provided a preliminary test of these hypotheses. In Experiments 1 and 2 we measured performance in terms of grammaticality and found no difference across the 3 sets of stimuli. In Experiment 3 we analyzed performance in terms of both grammaticality and chunk strength. Again we found no differences in performance. Our tentative conclusion is that the learning process aims to encode symbolic regularity independent of stimulus appearance.     

Ifá divination as an exercise in deconstructionism

Abstract

Placide Tempels’ Bantu Philosophy has largely been met with hostility from African philosophers. Whilst Tempels intended to show that the Bantu were not only capable of thinking, but also that they had a distinct and coherent philosophy of their own, his project seems to have achieved exactly the opposite. Temples’ project sought to expose the racism of thinkers such as Lucien Levy-Bruhl, thereby raising the African to the same status as the Westerner. However, his efforts have been rejected for a number of reasons ranging from the view that it is a theory of magic, freely generalized to the Bantu, to the accusation that his project fails to speak on behalf of the oppressed Bantu and furthermore, that he is overly obsessed with finding the African difference at the cost of reason. In this paper, I seek to argue that a neglected critique of Tempels is one that has to do with the basis of his philosophical racialism. I seek to show that at the root of Bantu Philosophy is racialism grounded in the same assumptions as those made by Levy-Bruhl. I seek to argue that the categories that Tempels creates for Bantu thought do not simply seek to articulate a genuine difference from Western categories. The Bantu categories are coined as inferior, incoherent, inarticulate, illogical, and mystified. I argue that it is for reasons of philosophical racialism that Tempels urges his Western audience to overthrow their logical and articulable systems if they ever want to understand the Bantu system of thought.     

Psychometric Properties and Factorial Structure of the State Trait Anxiety Inventory-Trait Version (STAI-T) in Caribbean University Students

The study investigated the psychometric properties of the State Trait Anxiety Inventory—Trait Scale (STAI-T: Spielberger, 1983) in a Caribbean university student sample. Participants were 415 undergraduate students (75% female) who completed the State-Trait Anxiety Inventory-Trait Version (STAI-T; Spielberger, 1983), Beck Depression Inventory-II (BDI-II; Beck, Steer, & Brown, 1996), the Zung Self-Rating Depression Scale (SDS; Zung, 1965), the Ego Resiliecy-89 (ER-89; Block, 1989), and the Perceived Stress Scale-Ten Item Version (PSS-10; Cohen et al., 1983). Confirmatory factor analysis (CFA) was conducted to examine the construct validity of the trait anxiety scale in terms of factor structure, convergent, discriminant, and nomological validities. CFA results revealed that a two-factor solution (trait anxiety absent and trait anxiety present) provided significantly better fit than the one-factor model of trait anxiety. There was clear evidence of convergent validity, discriminant validity, and nomological validity of the scale. Results support the psychometric adequacy of the STAI-T for use with Caribbean university students.     

A PET meta‐analysis of object and spatial mental imagery

Neuroimaging studies have described the functional neuroanatomy of mental imagery. Taken separately, specific studies vary in the nature of the task used and are limited by statistical power and sensitivity. We took advantage of a multistudy PET database of 54 subjects acquired in our laboratory to reveal the neural bases of spatial versus object mental imagery tasks. Our first goal was to evaluate to what extent the activated foci elicited by both object and spatial studies overlap. A second aim was to compare activations elicited by spatial imagery tasks to those elicited by object imagery tasks. We also explored applying regression analyses to the relationships between the scores on the Mental Rotations Test (MRT) and changes in regional cerebral blood flow (rCBF) during spatial and object imagery tasks. This meta‐analysis yielded the following observations: (1) both spatial and object imagery tasks shared a common neural network composed of occipitotemporal (ventral pathway) and occipitoparietal (dorsal pathway) regions and also by a set of frontal regions (related to memory); (2) the superior parietal cortex was more strongly implicated during spatial imagery; (3) object imagery specifically engaged the anterior part of the ventral pathway, including the fusiform, parahippocampal, and hippocampal gyrus; (4) object imagery activated the early visual cortex, whereas spatial imagery induced a deactivation of the early visual cortex; (5) blood flow values in some of the regions noted above were positively correlated with scores on the MRT: the higher the subjects performed on the MRT, the more pronounced the rCBF was in these regions. These results may reconcile some of the apparent discrepancies among previous studies concerning the activation of early visual cortex in mental imagery. They also contribute to a better knowledge of the neural bases of object and spatial mental imagery.     

Similarity chains in the transformational paradigm

Rips’ (1989) results with the transformational paradigm have often been cited as supporting accounts of categorisation not based on similarity, such as involving necessary or sufficient features (or a belief in such features), which guarantee a categorisation outcome once their presence has been established. We discuss a similarity account of the transformational paradigm based on similarity chains, which predicts that when the transformation is more gradual the identity of the transformed object is less likely to change. Conversely, we suggest that an essentialist approach to categorisation predicts that essences are more likely to change in gradual transformations, across generations, as is the case with evolutionary change of species. In two experiments we examined the scope of the similarity versus the essentialist account in the transformational paradigm. With space aliens, the similarity account was superior to the essentialist one, but the converse was true with earth creatures. We suggest that an essentialist mode of categorisation is more likely than a similarity one for stimuli that are in better correspondence with our naïve understanding of the world.