Mommy Brain Effect: There’s a Good Reason
by Sandi Schwartz
Feb 01, 2024
After you had your baby, did you feel like your brain went to mush? Between exhaustion, stress, and hormonal changes, so many women feel like their brain is not working anymore and that they can’t remember one minute to the next. Well, it turns out that this forgetfulness associated with “Mommy Brain” may actually have a necessary scientific function.

 A study published in the journal Neuron found that forgetfulness (for anyone, not just moms) could be caused by a safety mechanism in the brain designed to make sure we are not overloaded by too much information. Our brain is set up to flush out unnecessary memories in order to help us survive and thrive.

 The two researchers who conducted the study at the University of Toronto in Canada explain that our memory is not for us to convey the most accurate information. Instead, it is meant to help us make smart decisions using the information provided to us. We need our brain to forget irrelevant details so that we can focus on the most useful information that aids in our decision-making every day.

 The researches came to this assessment after reviewing several previously published papers analyzing different approaches about memory. Some of these studies looked at the neurobiology of remembering, or persistence, while others looked at the neurobiology of forgetting, or transience. They found lots of evidence that there are parts of our brain developed to promote memory loss, which are different from those that store information. One study, for example, involved scientists who trained mice to find a water maze. The maze location was moved, and then some of the mice were given a drug to help them forget where the original maze was. The mice who forgot the first round of training located the new maze more quickly.

 This new research suggests how a certain level of forgetfulness is designed to make us smarter. The point of memory is to guide us in making decisions—not to remember every detail of every event we experience. The brain actually spends energy causing us to forget information by generating new neurons that overwrite the old ones. As it turns out, memory is not supposed to act like a video recorder, but instead like a list of rules that help us make better decisions. It is productive for us if we forget outdated, irrelevant information that might confuse us or lead us in the wrong direction.

 In the report, the researchers outlined two key reasons why we need to forget information. First, it helps us adjust to new situations by letting go of past memories that we no longer need to hang on to. Forgetting old information allows us to be more efficient in our lives. Second, it keeps us from generalizing past events to make decisions about new ones. Our brains tend to forget memories of things that happened (episodic memories) more quickly than general knowledge (semantic memories). If we are trying to make decisions and our brain is constantly bringing up details of multiple conflicting memories, it makes it very difficult for us to make choices. Overall, the brain’s goal is to forget everything except those instances that really stand out. This is an amazing process shaped by evolution to help us survive.

 The researchers also think the amount of forgetting we do could depend on our environment. The faster pace of change causes a faster pace of forgetting information. This is fascinating given our current world filled with tweets, Facebook feeds, and 24/7 news cycles. Think about all the parenting articles you read as a new mom. The more you read, the less you will actually retain. Based on this research, you will only remember the really critical information that you need to help your child.

 So, what does this all mean? Although you may be frustrated that your memory is not as sharp as it once was and overwhelmed by the abundance of information being thrown at you on a daily basis, your brain is naturally filtering out the information that you truly need to care for your child. Our instincts are taking over so that you can be prepared to quickly react and make decisions as challenges come up.


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