Motor performance and concurrent cognitive tasks

Twenty students tapped between two targets while concurrently performing either a verbal or a visuospatial cognitive task. Speed of tapping and consistency revealed right- and left-hand disruption during solving either the con-current verbal or visuospatial task respectively. Accuracy of performance in terms of hitting the targets was not selectively disrupted by the cognitive activity. The results are discussed in terms of an attentional model of lateralization of cerebral function.     

Subjective time: cognitive and physical secondary tasks affect timing differently

Humans were trained on a temporal discrimination to make one response when the stimulus duration was short (2 s) and a different response when the stimulus duration was long (8 s). They were then tested with stimulus durations in between to determine the bisection point. In Experiment 1, we examined the effect of a secondary cognitive task (counting backwards by threes) on the bisection point when participants were trained without a cognitive load and were tested with a cognitive load or the reverse (relative to appropriate controls). When the cognitive load increased from training, the psychophysical function plotting long responses against the increase in stimulus duration shifted to the right (as if the internal clock slowed down), and when the cognitive load decreased from training the psychophysical function shifted to the left (as if the internal clock speeded up). In Experiment 2, when the secondary task consisted of exerting continuous force on a transducer (a physically effortful task), it had the opposite effect. When the required force increased from training, the psychophysical function shifted to the left (as if the internal clock speeded up), and when the required force decreased from training, the psychophysical function shifted to the right (as if the internal clock slowed down). The results support an attentional view of the subjective passage of time. A cognitive secondary task appears to decrease attention to temporal cues, resulting in the underestimation of the passage of time, whereas a force requirement appears to increase attention to temporal cues, resulting in the overestimation of the passage of time.     

Restorative effects of awe on negative affect after receiving negative performance feedback

The present study investigated the discrete positive effects of awe on negative job affect (NJA) arising from receiving negative performance feedback from a work supervisor or a co-worker. The participants were 131 business professionals and students at a large university in Kenya (females = 46%; age range 25 to 65 years). They participated in an experiment in which the emotion of awe was manipulated in an imagined situation where the participants received negative performance feedback from either a work supervisor or co-worker. Regression analyses of the data indicated that awe predicted a lower negative affect for negative feedback. Moreover, the indirect effects of the source of feedback on negative affect modulation were more significant for feedback received from co-workers than from supervisors. The positive emotion of awe may help one cope with negative performance feedback in a work setting.     

Ecology,language, and performance on spatial cognitive tasks

The study of the orientation systems that people use in different cultures to describe the location of objects in space has drawn some interest of researchers in the fields of anthropology, psycholinguistics, and cognitive psychology. There has been a rethinking of the “linguistic relativity hypothesis,” and some empirical studies tend to support the notion that language is the major determinant of encoding and cognitive performance on spatial tasks. This paper reports a cross‐cultural study carried out with 545 children aged 4 to 14 years, both schooled and unschooled, in India and Nepal. The field sites were selected taking into consideration how reference to spatial locations is organized in the language as well as in the local cultural practices. In a village near Varanansi in India, people organize spatial locations mainly with reference to cardinal directions, but in the city of Varanasi, relative references are also used, although people in both the locations speak the same language (i.e., Hindi). In a village in Nepal, on the other hand, the “uphill‐downhill” geocentric frame of reference is the most compelling. We test the relationship between ecology, culture, and language, encoding of spatial information, and performance on some Piagetian spatial tasks, taking age and schooling into account. Berry's eco‐cultural model is used to discuss the findings that support linguistic relativism at the group but not at the individual level. Les systèmes d'orientation spatiale utilisés dans différentes sociétés pour décrire la localisation d'objets ont attiré L'attention de chercheurs en anthropologie, en psycholinguistique et en psychologie cognitive. L'hypothèse du relativisme linguistique a été remise à L'ordre du jour et des études empiriques ont montré que la langue était un déterminant majeur de L'encodage spatial et de la performance à des épreuves de cognition spatiale. Cet article porte sur une étude interculturelle comparative effectuée avec 545 enfants de 4 à 14 ans, scolarisés ou non, en Inde et au Népal. Les trois terrains ont été sélectionnés en tenant compte de la façon dont les références spatiales sont organisées aussi bien dans la langue que dans les pratiques culturelles locales. Dans un village près de Bénares, en Inde, les objets sont localisés selon les points cardinaux, alors que dans la ville de Bénares, des références relatives (droite, gauche, devant, derrière) sont également utilisées, alors que la langue parlée est la même (le Hindi). Dans un village au Népal, le système spatial le plus utilisé est un cadre de référence géocentrique formé par L'opposition «en haut vers la montagne/en bas vers la vallée». Nous étudions les relations entre L'écologie, la culture et la langue, L'encodage d'informations spatiales et la performance à des épreuves spatiales dérivées de la théorie de Piaget, en tenant compte de L'âge et de la scolarisation. Le modèle éco‐culturel de Berry est utilisé comme cadre théorique pour mettre en perspective les résultats, qui confirment le relativisme linguistique au niveau du groupe mais pas au niveau individuel. El estudio de los sistemas de orientación espacial utilizados en diversas culturas para describir la localización de los objetos ha atraído la atención de los investigadores en antropología, psicolingüística y psicología cognitiva. A partir de una renovación de la hipótesis del relativismo lingüístico, algunos estudios empíricos parecen apoyar la noción de que el lenguaje es el determinante más importante de la codificación y el desempeño cognitivo en tareas espaciales. El presente artículo informa sobre un estudio transcultural comparativo, efectuado con 545 niños de 4 a 14 años, escolarizados o no, urbanos y rurales, en India y en Nepal. Los sitios en donde se llevó a cabo el trabajo de campo se seleccionaron tomando en cuenta la forma en que se hace referencia a localizaciones espaciales en la lengua y en las prácticas culturales. En un pueblo de las planicies del Ganges, los habitantes organizan el espacio de manera geocéntrica, según los puntos cardinales, mientras que en la ciudad de Benares, también se utilizan referencias relativas (izquierda/derecha), aún cuando la lengua es la misma (el hindú). En un pueblo de Nepal, el cuadro de referencia geocéntrica “arriba/abajo” es predominante. El presente estudio examinó las relaciones entre la ecología, la cultura, la lengua, la codificación de la información espacial y el desempeño en algunas tareas espaciales de Piaget, teniendo en cuenta la edad y la escolarización. Este estudio está basado en el marco teórico eco‐cultural de Berry. Los resultados confirman una forma moderada de relativismo lingüístico a nivel grupal, más no así a nivel individual.     

Complex span tasks, simple span tasks, and cognitive abilities: A reanalysis of key studies

There is great interest in the relationships between memory span tasks and cognitive abilities. However, the causes underlying their correlation remain unknown. In the present article, five key data sets were reanalyzed according to two criteria: They must consider complex span tasks (so-called working memory [WM] tasks) and simple span tasks (so-called short-term memory [STM] tasks), and they must comprise cognitive ability measures. The obtained results offer several points of interest. First, memory span tasks should be conceived from a hierarchical perspective: They comprise both general and specific components. Second, the general component explains about four times the variance explained by the specific components. Third, STM and WM measures are closely related. Fourth, STM and WM measures share the same common variance with cognitive abilities. Finally, the strong relationship usually found between memory span tasks and cognitive abilities could be tentatively interpreted by the component shared by STM and WM--namely, the capacity for temporarily preserving a reliable memory representation of any given information.     

Total sleep deprivation increases the costs of shifting between simple cognitive tasks

In two experiments we studied the effects of one night of total sleep deprivation on task-shift costs. In different conditions shifts were between types of judgment (extradimensional shifts) and between stimulus-response mappings (intradimensional shifts). In addition, with an alternating-runs procedure we used short and long response-to-stimulus intervals and also external precues to vary the opportunities for advance configuration of task sets. Under all conditions sleep deprivation increased shift costs derived from the 20% slowest reaction times, which were insensitive to the opportunities for advance configuration. Shift costs derived from the 20% fastest reaction times were increased only for extradimensional shifts. As indicated by congruency effects, the increase of shift costs after a night without sleep cannot be attributed to increased interference between competing task sets. The findings suggest that total sleep deprivation increases task-set instability and thus lapsing, in particular in conditions with long stimulus-to-response intervals and in shift trials. In addition total sleep deprivation seems to increase the duration of an exogenously controlled process involved in extradimensional shifts.     

Blood flow velocity changes in anterior cerebral arteries during cognitive tasks performance

Objective

Transcranial Doppler sonography (TCD) enables monitoring of blood flow velocities (BFVs) in basal cerebral arteries during different cognitive tasks performance with great temporal resolution. So far, BFVs changes during mental activity were monitored primarily in middle cerebral arteries (MCAs) and little is known about these changes in anterior cerebral arteries (ACAs).

Aim

To determine the effect of different cognitive tasks performance on BFV changes and hemispheric dominance in ACAs and to assess the most suitable activation test for monitoring of BFV changes in ACAs.

Methods

Fourteen right-handed, healthy subjects aged 20–26 were included in the study. BFVs in both ACAs were recorded simultaneously during performance of cognitive tasks designed to activate frontal lobes: phonemic verbal fluency test (pVFT), Stroop tests and Trail Making Tests (TMTs).

Results

A statistically significant BFV increase was recorded in both ACAs during performance of all cognitive tasks. Statistically significant right ACA dominance was found during performance of pVFT and TMTB. The most significant BFV increase was obtained during performance of TMTB.

Conclusion

Our result addressed cognitive tests with great activation potential for monitoring of ACAs that might be used in distinguishing of healthy individuals and patients with neurovascular or neurodegenerative diseases.     

Walking impairs cognitive performance among people with multiple sclerosis but not controls

People with multiple sclerosis (MS) complain of problems completing two tasks simultaneously; sometimes called ‘dual-tasking’ (DT). Previous research in DT among people with MS has focused on how adding a cognitive task interferes with gait and few have measured how adding a motor task could interfere with cognition. We aimed to determine the extent to which walking affects a concurrent working memory task in people with MS compared to healthy controls. We recruited MS participants (n = 13) and controls (n = 10) matched by age (±3 years), education (±3 years) and gender. Participants first completed the cognitive task (subtracting 7’s from the previous number) and then again while walking on an instrumented walkway. Although there were no baseline differences in cognition or walking between MS participants and controls, MS participants demonstrated a 52% decrease in number of correct answers during DT (p < 0.001). Mental Tracking Rate (% correct answers/min) correlated strongly with MS-related disability measured using the Expanded Disability Status Scale (EDSS; r(11) = −0.68, p < 0.01). We propose that compromised mental tracking during walking could be related to limited neural resource capacity and could be a potentially useful outcome measure to detect ecologically valid dual tasking impairments.     

An exploratory study of cognitive style in performance on matched and mismatched tasks

Researchers have suggested that task performance is often dependent upon the congruence of cognitive style and task. To explore this suggestion, 44 female and 4 male undergraduates were administered the Cognitive Style Analysis, the Closure Flexibility, the Composite Gestalt Completion Test, and the Vocabulary subtest from the WAIS. Specifically, four hypotheses were tested: (1) that participants with an analytic style will perform better than those with a wholistic style on the Closure Flexibility; (2) that participants with a wholistic style will perform better than those with an analytic style on the Composite Gestalt Completion Test; (3) that participants with an intermediate style will outperform persons with an analytic style on the Composite Gestalt Completion Test; and (4) that intermediate scorers would perform better than those with a wholistic style on Closure Flexibility. Only the second hypothesis was supported, so results provide only minimal support for the effect of match or mismatch of cognitive style and task performance.     

Switching between simple cognitive tasks: the interaction of top-down and bottom-up factors.

How do top-down factors (e.g., task expectancy) and bottom-up factors (e.g., task recency) interact to produce an overall level of task readiness? This question was addressed by factorially manipulating task expectancy and task repetition in a task-switching paradigm. The effects of expectancy and repetition on response time tended to interact underadditively, but only because the traditional binary task-repetition variable lumps together all switch trials, ignoring variation in task lag. When the task-recency variable was scaled continuously, all 4 experiments instead showed additivity between expectancy and recency. The results indicated that expectancy and recency influence different stages of mental processing. One specific possibility (the configuration-execution model) is that task expectancy affects the time required to configure upcoming central operations, whereas task recency affects the time required to actually execute those central operations.     

The relationship between cognitive ability and positive and negative priming in identity and spatial priming tasks

The authors examined whether stimulus activation and inhibition in the identity priming task are related to the temporal lobe, and whether these processes in the spatial priming task are related to the parietal lobe. Forty participants performed spatial and identity positive and negative priming tasks, the Vandenberg Mental Rotation task, and the Digit Span task. Both men and women showed significant positive and negative priming in the identity and spatial tasks with no gender difference. The magnitude of identity positive priming was predicted by the Digit Span task, and the magnitude of spatial positive priming was predicted by the mental rotation task. Only women showed a correlation between spatial ability and spatial negative priming. The results are partially consistent with the dorsal-ventral model of cognitive inhibition.     

Contribution of strategy use to performance on complex and simple span tasks

Simple and complex span tasks are widely thought to measure related but separable memory constructs. Recently, however, research has demonstrated that simple and complex span tasks may tap, in part, the same construct because both similarly predict performance on measures of fluid intelligence (Gf) when the number of items retrieved from secondary memory (SM) is equated (Unsworth & Engle, Journal of Memory and Language 54:68–80 2006). Two studies (n = 105 and n = 152) evaluated whether retrieval from SM is influenced by individual differences in the use of encoding strategies during span tasks. Results demonstrated that, after equating the number of items retrieved from SM, simple and complex span performance similarly predicted Gf performance, but rates of effective strategy use did not mediate the span-Gf relationships. Moreover, at the level of individual differences, effective strategy use was more highly related to complex span performance than to simple span performance. Thus, even though individual differences in effective strategy use influenced span performance on trials that required retrieval from SM, strategic behavior at encoding cannot account for the similarities between simple and complex span tasks.     

Movement-based compatibility in simple response tasks

Previous studies reported that movement observation affected movement execution. Using one and the same set of responses (i.e., lifting or tapping the finger), correspondence effects were observed for simple responses when the go-signals were similar to the responses (i.e., movies of finger movements) but not when they were dissimilar (i.e., moving squares). The difference was attributed to a higher degree of ideomotor compatibility with visible limb movements. We tried to provide further evidence for ideomotor theory by manipulating the degree to which different responses matched one and the same set of stimuli (drifting sine-wave gratings). To this end, we measured simple reaction time of dynamic (hand movements) or static (key presses) movements in response to the onset of object motion. Object motion and dynamic responses showed ideomotor compatibility without looking alike; however, both stimulus and response involved continuous displacements. Correspondence effects were observed for dynamic responses, but not for static responses.