A study in the June 2003 issue of Alcoholism: Clinical & Experimental Research uses internet-based methodology to find that heavy alcohol consumption has a negative impact on day-to-day memory.
"Prospective memory impairments include things like forgetting to send someone a birthday card on time, or forgetting what you're going to say in the middle of a sentence," said Jonathan Ling, a senior lecturer in psychology at the University of Teesside in the United Kingdom and first author of the paper. "Everyday memory failures include telling someone a story that you've told them before, or forgetting where things are normally kept. Obviously we all forget things from time to time, however, heavy users of alcohol make noticeably more of these mistakes than either non- or low-users of alcohol." Ling added that most of what is known about heavy drinkers' retrospective memory function is based on laboratory research, and even less is known about alcohol's effects on normal memory-related tasks that people perform from day to day.
For this study, researchers collected data from 763 participants (465 female, 298 males) using a specially created website on the University of Westminster web server. Memory was assessed using two self-report questionnaires: the Prospective Memory Questionnaire (PMQ), and the Everyday Memory Questionnaire (EMQ). The PMQ has three sub-scales that measure short-term habitual PM, long-term episodic PM, and internally cued PM. Respondents also self-reported their level of use of alcohol and other drugs by responding to the UEL (University of East London) Recreational Drug Use Questionnaire.
The results indicate a dose-dependent effect of alcohol use on day-to-day memory function.
"We found that heavy users of alcohol reported making consistently more errors than those who said that they consumed little or no alcohol," said Ling. "A typical heavy user of alcohol reported over 30 percent more memory-related problems than someone who reportedly did not drink, and almost 25 percent more problems than those who stated they drank only small amounts of alcohol. More specifically, those participants who reported higher levels of alcohol consumption were more likely to miss appointments, forget birthdays and pay bills on time. Deficits in everyday memory included problems with remembering whether they had done something, like locking the door or switching off the lights or oven, or forgetting where they put items like house keys."
Colin R. Martin, a lecturer in mental health in the department of health sciences at the University of York, and honorary consultant psychologist to the Addiction Service and National Monitoring and Evaluation Center of the Salvation Army, said these results "contribute to the increasing evidence base that a diverse range of memory impairment is associated with excessive alcohol consumption. This study is important because it extends our knowledge of alcohol-related memory impairment to everyday situations that most people can identify with, in contrast to laboratory-based memory tasks."
"We also found a significant increase in reported memory problems by people who claimed to drink between 10 and 25 units each week in comparison to non-drinkers," added Ling. "This is an important finding, as it indicates that even if people are using alcohol within the limits suggested by U.K. government guidelines, these individuals still report experiencing memory problems."
Source: University of Teesside News Release.