When do we find it difficult to do more than one thing at a time? What theories have been proposed to account for such difficulties?

Essay from the year 2004 in the subject Psychology - General, grade: 67% = 2:1, University of Nottingham (School of Psychology), language: English, abstract: In some situations humans can do two things at the same time quite easily, for example writing an essay and listening to an album. In other cases attempting to do two tasks simultaneously will lead to serious disruption of both tasks, for exa...