The Commentary on the Categories by Abū l-Farağ ibn aṭ-Ṭayyib is an important representative of the Aristotelian tradition in Arabic culture.

Gemass der Intention der Reihe "Orient und Okzident" steht die Darstellung und Analyse der mannigfaltigen Vernetzung beider Kulturraume von der Antike bis zur Gegenwart im Fokus. Das philosophiegeschichtliche und systematische Band, welches das Gros der Beitrage eint, ist der gemeinsame Bezug der diskutierten Denker (darunter al-Farabi, Avicenna und Thomas von Aquin) auf den Seelenbegriff des Aristoteles. Dabei stellt die aristotelische Seelenlehre in "De anima" die Basis fur die nachfolgende islamisch-arabische und christliche Debatte zum Seelenbegriff dar. Die religios-dogmatisch bedingten Differenzen im (...) Seelenkonzept mittelalterlicher islamischer und christlicher Autoren werden dabei ebenso berucksichtigt wie die historische Perspektive, welche die wechselseitige Befruchtung mittelalterlicher, neuzeitlicher und zeitgenossischer Diskussionen deutlich macht. (shrink)

In a recently published study combining transcranial magnetic stimulation and electroencephalography (TMS-EEG), an early component of TMS-evoked potentials (TEPs), i.e., M1-P15, was proposed as a measure of transcallosal inhibition between motor cortices. Given that early TEPs are known to be highly variable, further evidence is needed before M1-P15 can be considered a reliable index of effective connectivity. Here, we conceived a new preregistered TMS-EEG study with two aims. The first aim was validating the M1-P15 as a cortical index of transcallosal (...) inhibition by replicating previous findings on its relationship with the ipsilateral silent period (iSP) and with performance in bimanual coordination. The second aim was inducing a task-dependent modulation of transcallosal inhibition. A new sample of 32 healthy right-handed participants underwent behavioral motor tasks and TMS-EEG recording, in which left and right M1 were stimulated both during bimanual tasks and during an iSP paradigm. Hypotheses and methods were preregistered before data collection. Results show a replication of our previous findings on the positive relationship between M1-P15 amplitude and the iSP normalized area. Differently, the relationship between M1-P15 latency and bimanual coordination was not confirmed. Finally, M1-P15 amplitude was modulated by the characteristics of the bimanual task the participants were performing, and not by the contralateral hand activity during the iSP paradigm. In sum, the present results corroborate our previous findings in validating the M1-P15 as a cortical marker of transcallosal inhibition and provide novel evidence of its task-dependent modulation. Importantly, we demonstrate the feasibility of preregistration in the TMS-EEG field to increase methodological rigor and transparency. (shrink)