Neural correlates of dual task interference in rapid visual streams: an fMRI study

In rapid streams of visual stimuli, identification of a first target interferes with identification of a second target presented within the next half second (the attentional blink or AB). It has been suggested that rapid perceptual decisions under masking interference involve interactions between frontal and posterior cortex. We investigated the neural correlates of the AB using functional magnetic resonance imaging (fMRI). Twelve subjects viewed rapid streams of black letters in which were embedded two white target letters (T1 and T2) separated by either 300 or 700 ms. As expected, fewer correct T2 identifications were observed in the short-delay condition. Corresponding fMRI statistical images showed increased activation in inferotemporal and posterior parietal cortex, but also in lateral frontal cortex and cerebellum in the short-delay condition suggesting that these brain regions are associated with perceptual decisions under masking interference.     

Alzheimer's disease disrupts arithmetic fact retrieval processes but not arithmetic strategy selection

Three groups of healthy younger adults, healthy older adults, and probable AD patients, performed an addition/number comparison task. They compared 128 couples of additions and numbers (e.g., 4 + 9 15) and had to identify the largest item for each problem by pressing one of two buttons located under each item. Manipulations of problem characteristics (i.e., problem difficulty and splits between correct sums and proposed numbers) enabled us to examine strategy selection and specific arithmetic fact retrieval processes. Results showed that arithmetic facts retrieval processes, which were spared with aging, were impaired in AD patients. However, AD patients were able to switch between strategies across trials according to problem characteristics as well as healthy older adults, and less systematically than healthy younger adults. We discuss implications of these findings for further understanding AD-related differences in arithmetic in particular, and problem solving in general.     

Schizophrenia-like syndrome inducing agent phencyclidine failed to impair memory for temporal order in rats

Although subchronic phencyclidine (PCP) administration is recognized as a probative method to model schizophrenia-like symptoms in animals, only a few sets of data support the hypothesis of a cognitive prefrontal cortex (PFc) dysfunction in PCP-treated monkeys and rodents. Two experiments were here conducted to further test the integrity of prefrontal function in two versions of a memory for temporal order (MTO) task administered to rats. Original versions of this task elaborated by Kesner repeatedly yielded moderate to severe performance deficits in PFc lesioned rats. MTO assessment in an eight-arm radial maze consisted in a recency discrimination between two arms previously explored in the context of sequential forced choices. In Experiment 1, 16 naive Long-Evans rats were pre-trained on a variable version of the MTO task involving randomly re-mixed sequences until they reached a group criterion. Then, rats were treated daily for 21 days with PCP (10mg/kg) or saline vehicle and were tested on the same task approximately 20 h after an injection. The performance of the groups did not differ. In Experiment 2, 16 naive Long-Evans rats untrained prior to treatment received 27 daily injections of either PCP (10mg/kg) or saline vehicle and were tested, 20 h after each injection, on a constant version of the MTO task. This time, a fixed set of four sequences of successive arm entries was repeated within each daily session as well as across days. Again, prolonged PCP exposure failed to impair discrimination of temporal order despite the stability of sequential information over time. These negative results are not consistent with long-lasting hypofrontality, a major landmark of human schizophrenia, in the PCP rat model.     

Behaviorism in 1942: A Précis of Tilquin's Le Behaviorisme: Origine et Développement de la Psychologie De Réaction en Amérique

Book-length treatments of behaviorism from a philosophical and historical perspective are few in number. Tilquin''s (1942) is one of these, but its publication in French during World War II and the limited number of available copies make for difficult access. In this paper, I summarize the contents of the book for a general audience of behavior analysts. Tilquin''s work is a useful tour of the behaviorism of its time, and most of the topics discussed in it remain relevant to behavior analysis.     

Delayed masking and the auditory attentional blink: A test for retrieval competition and bottleneck models

The attentional blink (AB) corresponds to a transient deficit in reporting the second (T2) of two targets embedded in a rapid sequence of distractors. The retrieval competition (Shapiro, Raymond & Arnell, 1994) and bottleneck models (Chun & Potter, 1995; Jolicoeur, 1998) predict the attenuation of the deficit with the extension of the delay between T2 and its mask. This prediction was tested using auditory sequences of nonverbal stimuli in which the T2-mask interval was systematically varied. The magnitude of the auditory AB diminished with the lengthening of the interval from 50 to 150 ms while no time-locked deficit was observed with the longest (350 ms) and the shortest (10 ms) intervals. These results suggest that presenting a mask after T2 is not sufficient to produce an auditory AB: The mask must be perceivable as an auditory event distinct from the target and occur before T2 consolidation. The present study also provides evidence that as in vision, AB deficits take place in the auditory domain when T2 is masked by interruption but not by integration. Our findings are best accounted for in terms of bottlenecked processing limitations.     

Mental health care for ethnic minority individuals and communities in the aftermath of disasters and mass violence

Findings from research on psychiatric epidemiology, disaster effects, discrepancies in service use, and cross-cultural psychology are reviewed to generate guidelines for culturally responsive postdisaster interventions. Ethnicity and culture influence mental health care at various points: on need for help; on availability and accessibility of help; on help-seeking comfort (stigma, mistrust), and on the probability that help is provided appropriately. There are aspects of disaster mental health practice that may ameliorate many of barriers that contribute to ethnic disparities in service use. It is proposed that interventions should give greater attention to socially engaged emotions and functioning. To promote disaster recovery, practitioners are advised to: assess community needs early and often; provide easily accessible services; work collaboratively and proactively to reduce stigma and mistrust and engage minorities in care; validate and normalize distress and help-seeking; value interdependence as well as independence as an appropriate developmental goal; promote community action; and advocate for, facilitate, or conduct treatment and evaluation research. Notwithstanding the pain and stress they cause, disasters create opportunities to de-stigmatize mental health needs and build trust between providers and minority communities.     

Comparing Nouns and Verbs in a Lexical Task

We analyzed the differential processing of nouns and verbs in a lexical decision task. Moderate and high-frequency nouns and verbs were compared. The characteristics of our material were specified at the formal level (number of letters and syllables, number of homographs, orthographic neighbors, frequency and age of acquisition), and at the semantic level (imagery, number and strength of associations, number of meanings, context dependency). A regression analysis indicated a classical frequency effect and a word-type effect, with latencies for verbs being slower than for nouns. The regression analysis did not permit the conclusion that semantic effects were involved (particularly imageability). Nevertheless, the semantic opposition between nouns as prototypical representations of objects, and verbs as prototypical representation of actions was not tested in this experiment and remains a good candidate explanation of the response time discrepancies between verbs and nouns.     

The history of religions and francophone research in Europe: Main disciplinary trends in Switzerland,France, Belgium and Luxemburg

This article provides an overview (as of September, 2008) of the state of the field of l’histoire des religions in the four french-speaking countries of Europe. It discusses the pioneers, along with their followers and influence, the position of principle institutions regarding teaching in the field, and the general orientations of each university, along with distinct emphases that reflect recent socio-political and cultural developments. This detailed panorama brings to light the relative weakness of french-speaking research in the field of l’histoire générale des religions. It calls attention to tensions between the former high status of this academic area, more than half of a century ago, and the disrepute into which its comparativist project has fallen over the last decades. It asks how French secularism ‐ and the growing secularization of western societies more generally ‐ may have influenced perceptions of the discipline, its orientations, and its position in today's academic market academic market. It also considers the impact of declining comprehension of religious phenomena among younger generations and correlated concerns with popularisation.     

The Factor Structure of the State-Trait Anxiety Inventory: An Alternative View

Wagner and Copper (1963) reported high discriminative power for one score (the ACTivity score) of the Wagner Hand Test between (unskilled and semi-skilled) workers at Goodwill Industries, Akron, Ohio who had been rated “Satisfactory” or “Unsatisfactory” by their superiors.

An attempt to crossvalidate this finding, in a three-group design, in a large Western Canadian Plywood mill failed to produce the expected relationship; neither the ACT score, nor any of the other scores derived from this test showed any consistent trend in terms of postdicting activity level, or general acceptability of the 18 Ss involved in this study.