Health News
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Health News
Study suggests that adolescent exposure to alcohol can negatively affect learning, memory and behavior in adulthood
A study at Duke University suggests that repeated exposure to alcohol during adolescence causes long-lasting changes in the part of the brain that controls learning and memory. The study, published in the journal Alcoholism: Clinical & Experimental Research, helped explain how exposure to alcohol before the brain has fully developed can cause cellular and synaptic abnormalities and negatively affect behavior. Kentucky is ranked 9th in the nation for the percentage of children who drank alcohol before age 13 (25.1 percent), according to the state Department for Public Health.
"In the eyes of the law, once people reach the age of 18, they are considered adult, but the brain continues to mature and refine all the way into the mid-20s," said lead author Mary-Louise Risher, a post-doctoral researcher in Duke's Department of Psychiatry and Behavioral Sciences. "It's important for young people to know that when they drink heavily during this period of development, there could be changes occurring that have a lasting impact on memory and other cognitive functions.
Studies had shown that animals exposed to alcohol at an early age do not perform as well in memory tasks as those not exposed to it. The new study, which involved exposing young rodents to alcohol and waiting for them to grow into adulthood, found that the exposure also affects the hippocampus, the area of the brain that controls memory and learning. The researchers measured a cellular mechanism called long-term potentiation, which involves the strengthening of brain synapses being used to learn new tasks or bring up memories. Ideally, LTP should be high, especially in young people. The researchers found that the adult rodents exposed to the alcohol during adolescence had higher levels of LTP, which may seem to be a positive outcome but is actually not.
"If you produce too much LTP in one of these circuits, there is a period of time where you can't produce any more," said senior author Scott Swartzwelder, a Duke professor. "The circuit is saturated, and the animal stops learning. For learning to be efficient, your brain needs a delicate balance of excitation and inhibition?too much in either direction, and the circuits do not work optimally."
The researchers also observed a structural change in individual nerve cells: those exposed to alcohol at a young age have brain cells that appear immature, even in adulthood. "It's quite possible that alcohol disrupts the maturation process, which can affect these cognitive functions later on," Risher said. She also noted that the immature appearance of the cells might be associated with behavioral immaturity.
"In the eyes of the law, once people reach the age of 18, they are considered adult, but the brain continues to mature and refine all the way into the mid-20s," said lead author Mary-Louise Risher, a post-doctoral researcher in Duke's Department of Psychiatry and Behavioral Sciences. "It's important for young people to know that when they drink heavily during this period of development, there could be changes occurring that have a lasting impact on memory and other cognitive functions.
Studies had shown that animals exposed to alcohol at an early age do not perform as well in memory tasks as those not exposed to it. The new study, which involved exposing young rodents to alcohol and waiting for them to grow into adulthood, found that the exposure also affects the hippocampus, the area of the brain that controls memory and learning. The researchers measured a cellular mechanism called long-term potentiation, which involves the strengthening of brain synapses being used to learn new tasks or bring up memories. Ideally, LTP should be high, especially in young people. The researchers found that the adult rodents exposed to the alcohol during adolescence had higher levels of LTP, which may seem to be a positive outcome but is actually not.
"If you produce too much LTP in one of these circuits, there is a period of time where you can't produce any more," said senior author Scott Swartzwelder, a Duke professor. "The circuit is saturated, and the animal stops learning. For learning to be efficient, your brain needs a delicate balance of excitation and inhibition?too much in either direction, and the circuits do not work optimally."
The researchers also observed a structural change in individual nerve cells: those exposed to alcohol at a young age have brain cells that appear immature, even in adulthood. "It's quite possible that alcohol disrupts the maturation process, which can affect these cognitive functions later on," Risher said. She also noted that the immature appearance of the cells might be associated with behavioral immaturity.
- Deep In The Brain May Lie The Secret Of Why Some Smokers Quit Easily And Some Find It Nearly Impossible
When a person tries to quit smoking, the cravings, headaches and lethargy that come from the nicotine withdrawal makes it near impossible for many to be successful. But this lack of success could also be a result of how a smoker's brain is wired,...
- Soon-to-be Published Uk Study Begins To Unravel Why Prescription Pain-killing Drug Tramadol Is Habit-forming
In an attempt to get closer to understanding the plague of prescription pain-killer abuse, a study by a team of University of Kentucky researchers has shed new light on the potential habit-forming properties of the popular pain medication Tramadol. The...
- Kentuckians Binge Drink More Often Than Residents Of Any Other State, National Survey For Federal Health Agency Finds
By Tara Kaprowy Kentucky Health News Kentuckians binge drink an average of about six times per month, more often than people living in any other state, a report by the Centers for Disease Control and Prevention found. Binge drinking is defined as consuming...
- April 7 Is National Alcohol Screening Day
Every year thousands of people fall victim to alcohol-related injuries. The scary fact is that many of these injuries are caused by alcoholics who took their first drink when they were underage. The Screening for Mental Health website says ?Approximately...
- Exercising Your Brain
Physical exercise does more than help your heart - it also helps your brain. The reduction of cholesterol and avoiding plaque buildup in blood vessels, as well as maintaining a reasonable weight, may help keep your memory sharp. In an Owings Mills Times...