p487fig13.11 The three main properties of CogEM that help to explain how attentional blocking occurs.<BR>||  CogEM explanation of attentional blocking.  Internal drive input <-> Conditioned reinforcer learning (self-recurrent) <-> Competition for STM <- Motor learning.  1. Sensory representations compete for limited capacity STM.  2. Previously reinforced cues amplify their STM via positive feedback.  3. Other dues lose STM via competition.