Saturday, December 31, 2011

Alcohol Blackout

This post is for all you New Year's Eve party goers who don't remember where you were or what you did. If that's the case, then you experienced an alcohol-induced blackout. Haven't you always wondered about the clinical manifestations and neurobiological mechanisms of alcohol-induced blackouts? Maybe you have, but you can't remember.

A definitive review of the phenomenon by Rose and Grant (2010) explains that there are two different types of blackout: en bloc, a complete loss of memory for the affected time period; and fragmentary, where bits and pieces of memories remain. The en bloc blackout is more likely to occur when a large quantity of alcohol is ingested within a small time period.

What causes an alcohol blackout? A good source of information on the topic is the NIAAA website: What Happened? Alcohol, Memory Blackouts, and the Brain:
Alcohol primarily interferes with the ability to form new long–term memories, leaving intact previously established long–term memories and the ability to keep new information active in memory for brief periods. ... Blackouts are much more common among social drinkers—including college drinkers—than was previously assumed, and have been found to encompass events ranging from conversations to intercourse. Mechanisms underlying alcohol–induced memory impairments include disruption of activity in the hippocampus, a brain region that plays a central role in the formation of new autobiographical memories.
Rose and Grant (2010) summarize the suspected hippocampal mechanisms as follows:
Blackouts are caused by breakdown in the transfer of short-term memory into long-term storage and subsequent retrieval primarily through dose-dependent disruption of hippocampal CA1 pyramidal cell activity. The exact mechanism is believed to involve potentiation of gamma-aminobutyric acid-alpha [GABA-A]-mediated inhibition and interference with excitatory hippocampal N-methyl-d-aspartate [NMDA] receptor activation, resulting in decreased long-term potentiation [LTP].
In addition...
Another possible mechanism involves disrupted septohippocampal theta rhythm activity because of enhanced medial septal area gamma-aminobutyric acid [GABA]-ergic neurotransmission.

Women are more susceptible to alcohol blackouts than men (and recover more slowly) because of their generally less muscular body composition, and gender differences in pharmacokinetics.

Cheers to knowing what's happening in your brain after downing a few too many Jell-O shots. If you can remember tomorrow...


Rose, M., & Grant, J. (2010). Alcohol-Induced Blackout Journal of Addiction Medicine, 4 (2), 61-73 DOI: 10.1097/ADM.0b013e3181e1299d

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At March 05, 2012 6:17 AM, Anonymous Anonymous said...

What can you tell me about that thing when you get up in the morning after a dream and can remember it all, then as soon as your feet hits the floor you can't remember a thing about it.

What is that all about?

At March 05, 2012 9:13 AM, Blogger The Neurocritic said...

I would say it's about the very fragile nature of memory during the transition from REM sleep to wakefulness. You can forget very quickly because the dream is poorly consolidated. Sometimes the memory of a dream will pop into your head later in the day, when a related cue arises. Other times you'll remember when getting into bed the next night, because the context triggers the memory.


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