Psychologists have documented what they believe to be a clinical first - the case of an amnesic woman whose memory for new material is erased each night that she goes to sleep (movie fans will recognise this as a plot device in the 2004 film 50 First Dates. 2013 update: this is also the premise of the hit novel Before I Go To Sleep). Referred to as case FL, the woman developed these symptoms after she hit her head in a car accident in 2005, aged 48. Brain scans and neurological exams revealed no signs of brain damage, thus suggesting the woman is exhibiting what's known as psychogenic or functional amnesia - that is, symptoms in the absence of any detectable organic cause.
So was FL faking it, perhaps in pursuit of a compensation claim? Smith's team don't think so. Although healthy controls who were asked to fake FL's symptoms performed similarly on the memory tests, there were also differences. For example, unlike the healthy fakers, FL showed deficits in motor learning, and her confidence for test items dropped with repeated testing whereas theirs increased.
The researchers' theory is that FL truly believes she has the memory deficit that she describes and that unconscious processes may be involved in its manifestation. FL denied having seen the film 50 First Dates, which was released a year before her accident. However, she admitted that the film's female lead, Drew Barrymore, was her favourite actress, so she may have been aware of its plot. The film 'may have influenced FL's concept of how memory could fail after a car accident', the researchers said. 'The brain uses preexisting concepts of memory and through altered brain function creates a particular constellation of symptoms.'
What about treatment? Reassuring FL that evidence had been found for the intact functioning of her overnight memory proved unsuccessful. What did work was testing the limits of FL's memory-washing system. Thirty-six hours without sleep and her memories were okay. An hour's nap during the day and they were okay. In the end, it was established that FL can sleep at night for up to four to six hours at a time without experiencing the sense that she's lost the day's memories. By setting an alarm each night to wake her after bouts of three and a half hours sleep, FL has managed to overcome her strange condition. 'At our most recent contact (March 2010), she and her husband reported that she continues to use this regimen successfully,' the researchers said.
Smith, C., Frascino, J., Kripke, D., McHugh, P., Treisman, G., & Squire, L. (2010). Losing memories overnight: A unique form of human amnesia. Neuropsychologia, 48 (10), 2833-2840 DOI: 10.1016/j.neuropsychologia.2010.05.025
Post written by Christian Jarrett (@psych_writer) for the BPS Research Digest.
Real life cases of amnesia that are stranger than fiction.