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While the preparatory neural mechanisms of real and imagined body movements have been extensively studied, the underpinnings of self‑initiated, voluntary mental acts are largely unknown. Therefore, using electroencephalography (EEG), we studied the time course and patterns of changes in brain activity associated with purely mental processes which start on their own, without an external or interoceptive...
INTRODUCTION: Each human action involving tools requires transformations of motor responses of hands/ fingers (or different effectors) into mechanical actions of a tool. Whereas tools requiring a relatively low level of motor-to-mechanical transformations were extensively studied, little is known about the neural underpinnings of complex tool use, which involves compound motor‑to‑mechanical transformations...
INTRODUCTION: Using tools according to their functions requires parallel signal processing in numerous and specialized brain areas. So far, fMRI research on neural substrates underlying interactions with tools was mostly restricted to unimanual, pantomimed tool use. AIM(S): The scope of this project was to establish whether representations involved in planning bimanual grasps and subsequent usage...
There is compelling neuroimaging evidence for a common lefthemisphere praxis representation network supporting the control of meaningful actions. Yet, the idea of dissociable neural systems for tool use (transitive) and intransitive (symbolic) gestures was revived by reports of selective dissociations between imitation and pantomime of transitive and intransitive skills. Because the contribution of...
It has long been proposed that structural cortical asymmetries may underlie functional lateralization of the human brain. Given that interhemispheric differences in language processing are one of the most pronounced, most studies investigated whether this functional asymmetry has a structural correlate. Recently, it has been demonstrated that it is the insular cortex asymmetry (not the Broca’s area...
In typical right-handers, the processing of tool-related information is lateralized to the left hemisphere. Yet, the hemispheric dominance for tools in left-handers is still debated. Since visual half-field (VHF) paradigms provide a reliable measure of cerebral asymmetries, left vs. right hemisphere advantage for man-made object categorization was studied in 17 left-handers (9 women, mean age = 23...
The present study consisted of two experiments. The goal of the first experiment was to establish the just noticeable differences for the fundamental frequency of the vowel /u/ by using the 2AFC method. We obtained the threshold value for 27 cents. This value is larger than the motor reaction values which had been observed in previous experiments (e.g. 9 or 19 cents). The second experiment was intended...
Neuroimaging evidence (Kroliczak and Frey 2009) indicates that, in right-handers, the left-hemispheric praxis representation network (PRN) constitutes a general domain neural substrate for the planning of meaningful actions, whether or not they involve objects. Less is known about the relationship between PRN and motor dominance in consistent left-handers. Nevertheless, more recent neuroimaging in...
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