Alzheimer's disease, visual search and instrumental activities of daily living: A review and a new perspective on attention and eye movements

International audienc

The relationships between perceived control and episodic memory in adulthood

International audienc

Alzheimer's disease, visual search and instrumental activities of daily living: A review and a new perspective on attention and eye movements

International audienc

Manuel de neuropsychologie

International audienc

Perturbations du langage après lésion de l'hémisphère cérébral droit

Summary : Language disorders after right cerebral hemisphere damage. Language disorders after right cerebral hemisphere damage are known and documented since the fifties. However, the question of the nature of these disorders remains unresolved. This paper, reviewing recent data and hypothetical frameworks is aimed at addressing this question : are the cognitive processes involved in the expression of difficulties in verbal task specifically linguistic ? Rather, is it a question of an impairment of basic non-specific functions required for efficient verbal functioning ? Implications for the experimental approach of verbal dysfunctions in right brain damaged patients are discussed. Key-words : right hemisphere, language, cerebral damage.Résumé Les perturbations du langage après lésion de l'hémisphère cérébral droit sont connues et documentées depuis les années 1950. Cependant, la question de la nature de ces perturbations reste non résolue. Cet article tente de poser cette question : les processus cognitifs en cause dans l'expression de difficultés verbales sont-ils spécifiquement linguistiques ? A-t-on plutôt affaire à l'atteinte de fonctions de base, non spécifiques mais requises pour un fonctionnement langagier efficace ? A partir de la revue critique des données et cadres hypothétiques récents, les implications pour l'approche expérimentale des dysfonctionnements de la sphère verbale chez les patients cérébrolésés droits sont discutées. Mots clés : hémisphère droit, langage, lésion cérébrale.Faure Sylvane. Perturbations du langage après lésion de l'hémisphère cérébral droit. In: L'année psychologique. 1993 vol. 93, n°1. pp. 85-112

The relationships between perceived control and episodic memory in adulthood

International audienc

Gestures and related skills in developmental coordination disorder: A production-system deficit?

International audienc

Change Detection in Complex Scenes: Hemispheric Contribution and the Role of Perceptual and Semantic Factors

The perceptual salience and semantic relevance of objects for the meaning of a scene were evaluated with multiple criteria and then manipulated in a change-detection experiment that used an original combination of one-shot and tachistoscopic divided-visual-field paradigms to study behavioural hemispheric asymmetry. Coloured drawings that depicted meaningful situations were presented centrally and very briefly (120 ms) and only the changes were lateralised by adding an object in the right or in the left visual hemifield. High salience and high relevance improved both response times (RTs) and accuracy, although the overall contribution of salience was greater than that of relevance. Moreover, only for low-salience changes did relevance affect speed. RTs were shorter when a change occurred in the left visual hemifield, suggesting a right-hemisphere advantage for detection of visual change. Also, men responded faster than women. The theoretical and methodological implications are discussed

The right hemisphere advantage in visual change detection depends on temporal factors

What accounts for the Right Hemisphere (RH) functional superiority in visual change detection? An original task which combines one-shot and divided visual field paradigms allowed us to direct change information initially to the RH or the Left Hemisphere (LH) by deleting, respectively, an object included in the left or right half of a scene presented centrally. We manipulated the perceptual salience and semantic relevance of the change as well as the duration of the Inter-Stimulus Interval (ISI) between the scenes in order to clarify the role of the RH in memory and attention processes, and to explore whether lengthening the ISI would enhance the contribution of the LH. When analyzing data collapsed over the two levels (high vs. low) of salience and of relevance, changes were better detected in the left visual field (lvf) than in the right visual field (rvf) in the case of a short ISI, while no difference emerged in the case of a long ISI. Moreover, lengthening the ISI resulted in a performance decrement in the lvf, both for accuracy and response speed. The fact that the RH superiority was limited to short intervals indicates that stimulus-driven orienting contributes more than perceptual processing to this hemispheric asymmetry. When considering perceptual and semantic properties of the change, the effect of the ISI duration seemed to specifically emerge in the case of low relevance, with an enhancement of accuracy in the rvf when comparing the long with the short ISI. This suggests that the ISI influence on hemispheric performance operates on different levels

Detezione del cambiamento in scene visive complesse (salienza percettiva, rivelanza semantica e cpntributo degli emisferi cerebrali)

NICE-BU Lettres Arts Sci.Hum. (060882104) / SudocSudocItalyFranceITF