The authors describe ACT-R/perceptual-motor (ACT-R/PM), an integrated theory of cognition, perception, and action that consists of the ACT-R production system and a set of perceptual-motor modules. Each module (including cognition) is essentially serial, but modules run in parallel with one another. ACT-R/PM can model simple dual tasks such as the psychological refractory period (PRP), includin...

We give new examples of discrete Schrδdinger operators with potentials taking finitely many values that have purely singular continuous spectrum. If the hull X of the potential is strictly ergodic, then the existence of just one potential x in X for which the operator has no eigenvalues implies that there is a generic set in X for which the operator has purely singular continuous spectrum. A su...

Most studies using the psychological refractory period (PRP) design suggest that dual-task performance is limited by a central bottleneck. Because subjects are usually told to emphasize Task 1, however, the bottleneck might reflect a strategic choice rather than a structural limitation. To evaluate the possibility that central operations can proceed in parallel, albeit with capacity limitations...

one of the basic subjects in political sociology of every society is the nature of stat in that society. the states have different economical social culture and political nature. the essay studies the political nature of the state in studies the political nature of the state in iran during pahlavi period , from the view point of transition to democracy. the aim of study the political nature of ...

The main guidelines for Muslims in living life are the Qur'an and Hadith. Therefore, Islamic teachings contained Hadith must be taught from an early age. For children Madrasah Ibtidaiyah (MI), learning about Quran begins with reading writing activities, or what is known as basic literacy. This study seeks to explain how MI teachers principals new normal era continue improve Koran literacy stude...