a failure to remember positive events, with the explanation being that the depressed individual had an excess of negative memories. However, in 1986, J. Mark G. Williams and Keith Broadbent examined patterns of autobiographical memory in people who recently attempted suicide. When compared to a healthy control group, the suicidal group displayed a general memory, especially for positively valenced cues. This study contradicted past research by explaining that the bias to remember negative events is not due to an excess of negative memories, but is because of an overgeneral memory. Since this initial study, research on OGM has expanded and has been further implicated in the risk to and maintenance of depression and PTSD. References External links Memory