Author:Henshilwood, C; D'Errico, F; Vanhaeren, M; Van Niekerk, K; Jacobs, ZDate:16 Apr 2004There are two competing models for the emergence of modern human behaviour: first, a late emergence in Africa or Eurasia similar to 50 to 40 thousand years ago and second, and a gradual transition in Africa between 250 to 50 ka. The earliest ...Read more
Author:Tönsing, KM; Van Niekerk, K; Schlunz, Georg I; Wilken, IlanaDate:Apr 2019Background: Augmentative and alternative communication (AAC) can assist persons with complex communication needs to communicate competently with a variety of communication partners in a variety of contexts. However, AAC systems and intervention ...Read more