Perceptions of cause and control in people with Alzheimer's disease.

Purpose Of The Study: To explore cause and control illness representations in older adults with Alzheimer's disease (AD).

Design And Methods: Six older adults living in the North West of England completed semi-structured interviews that were subject to an interpretative phenomenological analysis.

Results: Three main themes emerged indicating that participants were trying to make sense of their AD by comparing it with their previous experience of physical health illnesses.

Task switching and subjective duration.

Three experiments investigated the effects of switching from a nontiming task (addition of rapidly presented digits) to estimation of the duration of short tones or visual stimuli (Experiments 1 and 2), or the production of time intervals (Experiment 3). In general, compared with trials without a task-switch, trials involving a switch resulted in shorter duration estimates, but longer productions. The difficulty of the nontiming task, and the gap between the nontiming task and the timing task, also played a role, at least in some cases.