Blackout Drunk: Signs, Causes, and Dangers of Blackout Drinking
In other words, as a result of the patterned input, cells at position B now are more responsive to signals sent from cells at position A. The potentiated response often lasts for an extended period of time, hence the term long-term potentiation. During the first half of the 20th century, two theoretical hurdles hampered progress toward an understanding of the mechanisms underlying the effects of alcohol on memory.
Why Does Alcohol Cause Memory Loss
Based on his observations, Ryback concluded that a key predictor of blackouts was the rate at which subjects consumed their drinks. He stated, “It is important to note that all the blackout periods occurred after a rapid rise in blood alcohol level” (p. 622). The two subjects who did not black out, despite becoming extremely intoxicated, experienced slow increases in blood alcohol levels.
Individualized, evidence based treatment, to fit your needs.
Recent research with humans has yielded compelling evidence that key areas of the frontal lobes play important roles in short-term memory and the formation and retrieval of long-term explicit memories (e.g., Shastri 2002; Curtis and D’Esposito 2003; Ranganath et al. 2003). Damage to the frontal lobes leads to profound cognitive impairments, one of which is a difficulty forming new memories. Despite the increase in research on and our understanding of alcohol-induced blackouts, additional 6 signs alcohol is hurting your relationship rigorous research is still needed. Studies examining potential genetic and environmental influences, as well as their interactions, are clearly warranted given recent research findings of Marino and Fromme (2015). Sex differences in alcohol-induced blackouts are another area in need of study. These inconsistent findings could be due in part to methodological differences across research studies and assessment of alcohol-induced blackouts, and future studies should address this issue.
Alcohol, Memory, and the Hippocampus
Although alcohol may act as a subjective, physiologic cue [2], a much more influential effect is its impairment of encoding [7,38]. An alcoholic blackout is amnesia for the events of any part of a drinking episode without loss of consciousness. It is characterized by memory impairment during intoxication in the relative absence of other skill deficits. Early documentation from Alcoholics Anonymous describes a variety of blackout behavior, especially in the en-bloc type, which includes driving for long distances or carrying on apparently normal conversations at parties.
- Their impaired state of mind puts them at higher risk of compulsive behavior, physical injury, alcohol poisoning, and death.
- Alcohol can affect brain function and memory.1 While the exact ways alcohol affects brain chemistry can be complex, heavy alcohol use can have negative short-term and long-term health outcomes regarding one’s memory.
- Hypnotics or sedatives and benzodiazepines like flunitrazepam (also known as Rohypnol or roofies) can also lead to blackouts or brownouts.
- Indeed, in rats, putting alcohol directly into the medial septum alone produces memory impairments (Givens and McMahon 1997).
- If you’re having difficulty concentrating, remembering recent events or keeping track of a conversation, you may be close to getting blackout drunk.
Recuerdos Interrumpidos: Lagunas mentales inducidas por el alcohol
CBT helps people identify stressful triggers and put techniques in place to cope when they feel overwhelmed. Many different symptoms could accompany epileptic blackouts, depending on the type of seizure that a person is experiencing. The American Heart Association (AHA) describe a syncope blackout as a short temporary loss of consciousness that happens when not enough blood reaches the brain. According to the National Institute on Alcohol Abuse and Alcoholism, a very high blood-alcohol concentration may result in a person struggling to remain conscious. In the most severe cases of alcohol intoxication, they may even fall into a coma. Due to this, it is really important to get someone emergency help if their condition is deteriorating.
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. As the amount of alcohol consumed increases, so does the magnitude of the memory impairments. Large amounts of alcohol, particularly if consumed rapidly, can produce partial (i.e., fragmentary) or complete (i.e., en bloc) blackouts, which are periods of memory loss for events that transpired while a person was drinking. Blackouts are much more common among gray death is the latest “scariest” opioid drug threat 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 auotbiographical memories. Perhaps the greatest impediment to rigorous tests of alcohol-induced blackouts and behavior is that researchers are not ethically permitted to provide alcohol in sufficient doses to cause a blackout to occur.
Another complicating factor for research on blackouts is the potential use of other drugs (illicit or prescription) that might also contribute to memory loss. Although several research studies statistically control for or exclude individuals who report co-occurring illicit drug use, research clearly indicates that some individuals who report blackouts also report other drug use (Baldwin et al., 2011; Haas et al., 2015). Thus, researchers must be cautious and account for factors other than alcohol that might contribute to blackouts. Based on the Marino and Fromme (2015) findings, one could speculate that a genetic vulnerability to alcohol-induced blackouts is expressed only under certain environmental conditions, representing a possible gene by environment interaction.
Noting that recovering alcoholics frequently reported having experienced alcohol-induced amnesia while they were drinking, Jellinek concluded that the occurrence of blackouts is a powerful indicator of alcoholism. Nevertheless, memory formation and retrieval are also influenced by other cognitive factors such as attention and motivation [39]. Some studies suggest that alcohol may have detrimental effects on certain aspects of retrieval [2]. A recent animal research paper showed that alcohol can cause retrograde memory impairments. Rats were allowed to learn while sober, but if that learning was followed by a very high dose of alcohol, then the next day or two they showed severe memory impairment. This suggests that blackouts are not always due to deficits in encoding, attention or other memory-related processes but also can be due to consolidation or retrieval impairments.
Reminding a subject of events during the blackout often brings on more forgotten memories [4]. Such reminders, or cues, may provide contextual information during which a memory was formed, giving access to memory that was deficiently encoded. The mechanisms of an alcohol-induced blackout may be crucial in what came first, the alcohol, or the alcoholic thinking understanding its clinical implications. For a long time the effect of alcohol was thought to be a generalized depression of neural activity causing global impairment of cognitive, psychological, and behavioral domains [5–7]. An alcoholic blackout was perceived as the extreme manifestation of this effect.
The interpretation of the effects of alcohol on memory likely would vary somewhat depending on the memory model one uses. The second barrier to understanding the mechanisms underlying alcohol’s effects on memory was an incomplete understanding of how alcohol affects brain function at a cellular level. Until recently, alcohol was assumed to affect the brain in a general way, simply shutting down the activity of all cells with which it came in contact. The pervasiveness of this assumption is reflected in numerous writings during the early 20th century.
It is, however, difficult for investigators to be totally accurate because people may often fail to remember having a blackout, or do not attend to all circumstances in which they might have had a blackout, particularly fragmentary blackouts. Despite advances in human neuroimaging techniques, animal models remain absolutely essential in the study of mechanisms underlying alcohol-induced memory impairments. Hopefully, future work will reveal more regarding the ways in which the effects of alcohol on multiple transmitter systems interact to disrupt memory formation. During the 2 weeks preceding the survey, an equal percentage of males and females experienced blackouts, despite the fact that males drank significantly more often and more heavily than females. This outcome suggests that at any given level of alcohol consumption, females—a group infrequently studied in the literature on blackouts—are at greater risk than males for experiencing blackouts. The greater tendency of females to black out likely arises, in part, from well-known gender differences in physiological factors that affect alcohol distribution and metabolism, such as body weight, proportion of body fat, and levels of key enzymes.
Similar results have been observed in animal studies (White et al. 2000a). In a subsequent study, White and colleagues (2004) interviewed 50 undergraduate students, all of whom had experienced at least one blackout, to gather more information about the factors related to blackouts. As in the previous study, students reported engaging in a range of risky behaviors during blackouts, including sexual activity with both acquaintances and strangers, vandalism, getting into arguments and fights, and others. During the night of their most recent blackout, most students drank either liquor alone or in combination with beer. Only 1 student out of 50 reported that the most recent blackout occurred after drinking beer alone.
Too much alcohol can temporarily inhibit the brain’s transfer of memories from short- to long-term storage. White and Best administered several doses of alcohol in this study, ranging from 0.5 g/kg to 1.5 g/kg. (Only one of the experiments is represented in figure 3.) They found that the dose affected the degree of pyramidal cell suppression. Although 0.5 g/kg did not produce a significant change in the firing of hippocampal pyramidal cells, 1.0 and 1.5 g/kg produced significant suppression of firing during a 1-hour testing session following alcohol administration. The dose-dependent suppression of CA1 pyramidal cells is consistent with the dose-dependent effects of alcohol on episodic memory formation. Regardless of age, recent studies show more frequent blackout experiences are related to an increase in memory lapse and cognitive difficulties even after alcohol misuse is corrected.
Several factors affect the likelihood that information will be transferred into long-term memory. For decades, researchers have known that alcohol disrupts the brain’s ability to transfer memories from short-term to long-term memory, but they didn’t know how. The common consensus was that alcohol killed brain cells, causing memory loss and other cognitive impairments. Modern neuroimaging techniques, such as positron emission tomography (PET) and functional magnetic resonance imaging (fMRI), provide incredible opportunities for investigating the impact of drugs like alcohol on brain function during the performance of cognitive tasks. The use of these techniques will no doubt yield important information regarding the mechanisms underlying alcohol-induced memory impairments in the coming years. Memory formation and retrieval are highly influenced by factors such as attention and motivation (e.g., Kensinger et al. 2003).