Unlike noncommutative space, when space and time are noncommutative, it seems necessary to modify the usual scheme of quantum mechanics. We propose in this paper a simple generalization of the time evolution equation in quantum mechanics to incorporate the feature of a noncommutative spacetime. This equation is much more constraining than the usual Schrödinger equation in that the spatial dimen...

This review aims at clarifying the concept of first language attrition by tracing its limits, identifying phenomenological and contextual constraints, discussing controversies associated with definition, suggesting potential directions for future research. We start reviewing different definitions as well inconsistencies. then discuss underlying mechanisms available evidence supporting backgroun...