Cognitive neuroimaging: cognitive science out of the armchair

Cognitive scientists were not quick to embrace the functional neuroimaging technologies that emerged during the late 20th century. In this new century, cognitive scientists continue to question, not unreasonably, the relevance of functional neuroimaging investigations that fail to address questions of interest to cognitive science. However, some ultra-cognitive scientists assert that these experiments can never be of relevance to the study of cognition. Their reasoning reflects an adherence to a functionalist philosophy that arbitrarily and purposefully distinguishes mental information-processing systems from brain or brain-like operations. This article addresses whether data from properly conducted functional neuroimaging studies can inform and subsequently constrain the assumptions of theoretical cognitive models. The article commences with a focus upon the functionalist philosophy espoused by the ultra-cognitive scientists, contrasting it with the materialist philosophy that motivates both cognitive neuroimaging investigations and connectionist modelling of cognitive systems. Connectionism and cognitive neuroimaging share many features, including an emphasis on unified cognitive and neural models of systems that combine localist and distributed representations. The utility of designing cognitive neuroimaging studies to test (primarily) connectionist models of cognitive phenomena is illustrated using data from functional magnetic resonance imaging (fMRI) investigations of language production and episodic memory.     

Neuromuscular-skeletal origins of predominant patterns of coordination in rhythmic two-joint arm movement

The authors tested for predominant patterns of coordination in the combination of rhythmic flexion-extension (FE) and supination- (SP) at the elbow-joint complex. Participants (N=10) spontaneously established in-phase (supination synchronized with flexion) and antiphase (pronation synchronized with flexion) patterns. In addition, the authors used a motorized robot arm to generate involuntary SP movements with different phase relations with respect to voluntary FE. The involuntarily induced in-phase pattern was accentuated and was more consistent than other patterns. The result provides evidence that the predominance of the in-phase pattern originates in the influence of neuromuscular-skeletal constraints rather than in a preference dictated by perceptual-cognitive factors implicated in voluntary control. Neuromuscular-skeletal constraints involved in the predominance of the in-phase and the antiphase patterns are discussed.     

Partial support from a non-replication: comment on Roma, Silberberg, Ruggiero, and Suomi (2006)

A purported replication by P. G. Roma, A. Silberberg, A. M. Ruggiero, and S. J. Suomi of the authors' previous study claims to contradict their finding that capuchin monkeys (Cebus apella) refuse to exchange with an experimenter if their partner receives a superior reward. Roma et al. used no exchange task, however, or any other task. Roma et al. offered frustration as explanation of their findings, yet failed to statistically prove that the effect of frustration is stronger than that of inequity. They also misrepresented the dependent measure of the authors' study. Reanalysis of the authors' own data indicated no role of frustration, that is, no effect of previous experience with a superior reward. The authors conclude that Roma et al.'s study is not a replication and does not disprove the authors' findings.     

Goal setting in acquisition of a volleyball skill late in motor learning

To examine the effects of different types of goal setting on motor skill acquisition during advanced stages of learning. 44 female volleyball players were tested in four experimental training groups with generic goals, specific long-term goals, specific short-term goals, and as a control group. This study's pretest, training, and retention test phases used performance of a volleyball dig/forearm pass oriented to a target. Analyses yielded no significant differences among groups, although performance increased from pre- to retention test.     

Accounting for sequential trial effects in the flanker task: Conflict adaptation or associative priming?

The conflict-control loop theory proposes that the detection of conflict in information processing triggers an increase in cognitive control, resulting in improved performance on the subsequent trial. This theory seems consistent with the robust finding that conflict susceptibility is reduced following correct trials associated with high conflict: the conflict adaptation effect. However, despite providing favorable conditions for eliciting and detecting conflict-triggered performance adjustments, none of the five experiments reported here provide unequivocal evidence of such adjustments. Instead, the results corroborate and extend earlier findings by demonstrating that the conflict adaptation effect, at least in the flanker task, is only present for a specific subset of trial sequences that is characterized by a response repetition. This pattern of results provides strong evidence that the conflict adaptation effect reflects associative stimulus-response priming instead of conflict-driven adaptations in cognitive control.     

Assessment of Functional Impairment in Spanish Children

Le pressent travaux vérifie l’applicabilité et la validité du CAFAS, un instrument pour évaluer l’incapacité fonctionnel dans une population espagnole. L’échantillon est formé par 441 malades ambulatoires psychiatriques d’entre 8 et 17 années et leurs parents, et aussi par un échantillon de 74 malades ambulatoires pédiatriques. On a applique différents instruments pour évaluer l’incapacité fonctionnel, la psychopathologie, et autres variables psychologiques. La fiabilité intra observateur varie entre modérée et bonne. L’accord entre les ponctuations obtenues avec l’information des parents et des infants varie entre faible et modérée. Les corrélations avec autres mesures d’incapacité et du fonctionnement sont significatives mais modérée. Les ponctuations CAFAS différencient significativement les enfants avec et sans psychopathologie. Les résultats obtenus avalisent l’utilisation du CAFAS pour les études en psychopathologie, en incapacité fonctionnel et pour planifier interventions et services de santé mental. The present work tests the applicability and validity of the CAFAS, an instrument for assessing functional impairment, in the Spanish population. The sample included 441 psychiatric outpatients from 8 to 17 years old and their parents, and a pediatric group of 74 outpatients. Different instruments for assessing functional impairment, psychopathology, and other related variables were used. Interrater reliability ranged from moderate to very good. Weak‐to‐moderate agreement between CAFAS scores based on information from parents and children was obtained. Correlations with other measures of impairment and functioning were moderate. CAFAS scores differentiated significantly between children with and without psychopathology. These results permit the use of the instrument for studies on psychopathology and functional impairment, and for planning intervention and mental health services.