The interleaving of actions in everyday life multitasking demands

It has been argued that executive tests should capture central aspects of executive functions in everyday life such as initiating and monitoring parallel actions in low-structured environments (so-called multitasking; see Burgess, 2000). We present a cooking task in order to assess executive function impairments in brain-damaged patients, which focuses on a central feature of multitasking, the interleaving of tasks (Burgess, 2000). Behavioural performance of 21 brain-damaged patients (stroke, traumatic brain injury) and of a group of matched controls was analysed on the basis of a standardized protocol. In comparison to controls, the patients explored less, were less successful in monitoring their actions and corrected errors less efficiently. Interleaving of actions was observed less frequently in patients, with respect to both cooking itself as well as to subordinate goals (e.g., cleaning up). Interleaving proved efficient, as it was associated with less time to complete the task. Patients' scores in the cooking task correlated with performance in both the Behavioural Assessment of the Dysexecutive Syndrome (BADS) Zoo Map Test and the BADS Six Elements Test, but not with tests of attention, verbal memory, or figural fluency, thus demonstrating convergent and discriminant validity. In summary, our task demonstrates that cooking can provide a valid testing ground for assessing a central aspect of everyday multitasking demands, namely, the interleaving of actions.     

The spontaneity of media interviews

The aimof this study is to show that, for effective communication in interviews, media professionals sometimes speak spontaneously instead of reading their questions. The research question arises from the incompatibility of ideal delivery, on the one hand, and the concept of spontaneity as hesitant and therefore defective, on the other. In a 2×2(speakersxtasks) within-subject design, readings and interviews of prominent American TV network anchormen (W. Cronkite and D. Rather) are compared in terms of temporal and hesitation variables. The results indicate differences between the two types of speaking in pause duration, variance of articulation rate per phrase-length unit, occurrence of pauses at various syntactic positions, the relationship between pause duration and pause position, and occurrence of vocal hesitations (filled pauses, repeats, and false starts). The findings are interpreted in terms of a neglected but basic concept required for any theory of language use—communicative intent.     

Comparisons of native and foreign language poetry readings: Fluency,expressiveness, and their evaluation

Summary American college and German Gymnasium students read an English and German poem in their respective native (L1) and foreign (L2) languages. In L2, articulation rate (syl/s) was slower and phrase length (syl/pause) shorter than in L1. Only the German women read expressively: Mean pause duration was higher than all other groups in L1 and lower in L2. Evaluations of fluency and expressiveness by American teachers of German and German teachers of English paralleled these results. Two cut-off points (0.27 and 0.13 sec) for measurements of minimum pause duration were examined, and cautions regarding use of a high cut-off point given.     

Perceptions of relative group size and group status: Effects on intergroup discrimination in negative evaluations

The positive–negative asymmetry in social discrimination proposes a threshold for ingroup favouritism within the negative domain: in contrast to comparable studies dealing with in- and outgroup evaluations on positive attributes, ingroup favouritism does not occur when negative attributes are used. The present study focuses on two aspects of this threshold: it investigates processes, which may influence the absence of ingroup favouritism in the negative domain, and it tests ‘aggravating’ variables, which seem to be suficient to elicit ingroup favouritism even in the negative domain. Results show that ingroup favouritism occurred within the negative domain when several aggravating conditions were included, namely high salience of size- and status- similarity between groups and high ingroup identification. Furthermore, subjects under minimal conditions tended to overestimate relative size as well as relative status of their ingroup. The perception of group members to belong to a high status majority is interpreted as a sufficient condition counteracting tendencies towards ingroup favouritism within the negative domain.     

Deficits in acquiring language structure: The importance of using prosodic cues

The study investigates and supports the hypothesis that (1) specifically language-impaired (SLI) children have deficits in processing and using the rhythmic-prosodic structure of speech; and that (2) these deficits impede the implicit learning of formal regularities of input language. The ability of SLI children to exploit prosodic cues in rule learning was tested in an experimental design using a miniature language. Twenty-four SLI children (mean age 6;5) learned a small set of sentences generated by a content-free rule system. The sample sentences were presented either with or without prosodic cues to the underlying formal regularities. The experimental groups were matched by various cognitive and language indicators. To assess whether they had acquired some regularities of the miniature language, a grammaticality judgement task was presented. In addition, their ability to reproduce rule-structured and rule-violating strings was tested. The experimental as well as some additional correlational data support the basic theoretical assumptions. The children had deficits in processing and exploiting prosodic cues in rule learning, and these deficits covaried with their rhythmic ability as indicated by a rhythm discrimination task.     

Interplay of Literacy and Orality in Inaugural Rhetoric

Inaugural addresses require a complex interplay of literacy and orality. They are written to be performed, but oral performance is not explicable in terms of textual analyses alone. Texts of the 55 inaugurals of the 42 U.S. presidents and audio recordings of the 16 dating from F. D. Roosevelt were the corpus for this study. The general hypothesis was that changes in media technology and in Presidential governance have moved both text and performance of inaugurals in the twentieth century in the direction of conversational style. Textual response measures were frequency-of-occurrence ratios of words (per paragraph, sentence, punctuation, and discourse marker), of syllables (per paragraph, sentence, word, punctuation, and discourse marker), and of first-person pronominal forms. Performance response measures were speech and articulation rates, percentage of pause time, pause duration, and phrase length. Use of contractions was also analyzed. Textual analyses showed a shortening of units and a shift from singular to plural first-person pronominal forms in the course of 200 years. Performance of the inaugurals over the past 60 years showed no diachronic changes, but was dramatically slower than that of other speech genres. Use of contractions was limited to three recent inaugurals. Various published texts of Reagan's first inaugural and Bush's and Clinton's inaugurals were compared with one another and with the audio recordings and were found to differ from one another in text, punctuation, and format, and from the audio recordings in text. The notion of conversational style is critically discussed, particularly in terms of the boundaries imposed upon it by the norms of both literacy and orality.     

Assessment of Psychotic Disorders in Inpatient Children and Adolescents: Use of the Devereux Scales of Mental Disorders

The Devereux Scales of Mental Disorders (DSMD), with its 3-factor model of measurement (i.e., Internalizing, Externalizing, and Critical Pathology), may be useful in screening for psychotic disorders in children. This study assessed the ability of the DSMD to differentiate between inpatient children and adolescents with psychotic disorders (n = 18) and those with other clinical syndromes (n = 71). Results of ANCOVAs indicated that the psychotic group scored significantly higher on most DSMD scales and composites than the nonpsychotic clinical group. However estimates of effect size were particularly large for the Critical Pathology Composite and the Autism and Acute Problems Scales. Diagnostic efficiency statistics revealed that the DSMD's Critical Pathology Composite was highly accurate in differentiating between the 2 clinical groups. These findings support the utility of the DSMD in identifying children and adolescents with psychotic disorders.     

Visual homing in the absence of feature-based landmark information

Despite that fact that landmarks play a prominent role in human navigation, experimental evidence on how landmarks are selected and defined by human navigators remains elusive. Indeed, the concept of a ‘landmark’ is itself not entirely clear. In everyday language, the term landmark refers to salient, distinguishable, and usually nameable objects, rendering the problem of landmark recognition a special case of the general object recognition problem. In contrast, in the insect and robot literature, this notion of landmarks is often replaced by the “local position information” [e.g., Trullier, O., Wiener, S., Berthoz, A., &; Meyer, J.-A. (1997). Biologically based artificial navigation systems: Review and prospects. Progress in Neurobiology, 51, 483–544], referring to the entire set of sensor readings obtained at one location. This set may then serve as a characteristic of the particular location. Honey bees have been shown to base place recognition and homing on a snapshot-like memory of the place’s visual environment, not on the distances to recognized objects [Cartwright, B., &; Collett, T. (1983). Landmark learning in bees. Experiments and models. Journal of Comparative Physiology A, 151, 521–543]. A number of theoretical models of snapshot-based homing [e.g., Franz, M., Schölkopf, B., Mallot, H. A., Bülthoff, H. H. (1998). Where did I take that snapshot? Scene-based homing by image matching. Biological Cybernetics, 79, 191–202; Vardy, A., &; Möller, R. (2005). Biologically plausible visual homing methods based on optical flow techniques. Connection Science, 17, 47–89] predict that the accuracy of snapshot-based homing should depend on image contrast. For rodent hippocampal place fields, models have been developed using additional image information such as three-dimensional depth and allocentric orientations (e.g., room axes) and are thus less sensitive to image contrast and noise [e.g. Barry, C., Lever, C., Hayman, R., Hartley, T., Burton, S., O’Keefe, J., et al. (2006). The boundary vector cell model of place cell firing and spatial memory. Reviews in the Neurosciences, 17, 71–79]. Here, we study human visual homing in a virtual environment void of objects and readily detected image features. The environment was a circular room with a homogenous colour gradient covering the wall and uniform floor and ceiling. Subjects were able to approach remembered places. Accuracy decreased with colour gradient modulation and room size, in qualitative agreement with the snapshot model but not with other models of place recognition. We conclude that human memory for places can make use of a snapshot algorithm.     

Age differences between children and young adults in the dynamics of dual-task prioritization: body (balance) versus mind (memory)

Task prioritization can lead to trade-off patterns in dual-task situations. The authors compared dual-task performances in 9- and 11-year-old children and young adults performing a cognitive task and a motor task concurrently. The motor task required balancing on an ankle-disc board. Two cognitive tasks measured working memory and episodic memory at difficulty levels individually adjusted during the course of extensive training. Adults showed performance decrements in both task domains under dual-task conditions. In contrast, children showed decrements only in the cognitive tasks but actually swayed less under dual-task than under single-task conditions and continued to reduce their body sway even when instructed to focus on the cognitive task. The authors argue that children perform closer to their stability boundaries in the balance task and therefore prioritize protection of their balance under dual-task conditions.