Understanding the Link Between Depression and Memory Loss
Do you find yourself spending more time looking for your lost keys or apologizing for missing appointments you forgot to put on your calendar? Is it possible there is a link between your memory loss and depression?
Living With Depression
Anyone dealing with depression understands that depression is more than just feeling down or sad. One of the symptoms linked to depression is memory loss.
A lot of research exists showing a link between depression and cognitive issues. For example, one recent study discussed dysphoria. Dysphoria is when your mind spends a lot of energy focusing on mood-congruent information. With time, dysphoric individuals will spend less brainpower on goal-relevant information, including processing information and having access to working memory.
In other words, when people battle depression, their brains may use excessive resources to deal with and process the emotions they face, leaving limited resources for focusing on things like day-to-day memory and concentration. This phenomenon explains why we see memory loss in individuals dealing with depression.
When depression leads to memory issues, it makes everyday things like working and studying a greater challenge. It can also make it difficult for people to carry out daily tasks, stay organized, and plan their lives.
The Long-Term Effects of Depression on Memory
Major depression, also referred to as clinical depression or unipolar depression, leaves a person with symptoms like feelings of sadness or despair, low mood, and loss of interest in everyday life. Research estimates that approximately 17 million adults in the United States have experienced one or more major depressive episodes.
Many are surprised to learn that, according to some research, depression can affect people’s cognitive function, long-term memory, and working memory even after their condition is controlled. Research also shows that attention and memory deficits worsen when individuals have repeated episodes of major depression.
How Depression Affects Autobiographical Memory
Depression has also been shown to impact autobiographical memory. Autobiographical memory can be described as a system that pulls on other systems to function.
When your brain recalls autobiographical information about your life, it pulls from somatic memory, sensory memory, episodic memory, and iconic memory. When people try to remember something about themselves, they will take from all of these areas and put the information into one “room” to process the memory.
Autobiographical memories define a person’s emotional life. Humans rely on these memories for input in planning and dealing with everyday challenges. They help a person have an updated sense of self. Autobiographical memory is a milestone that allows people to understand their place in the world and how they interact with others.
Autobiographical memory dysfunction may be one of the primary causes of ruminative retrieval of overall general negative information observed in individuals with depression. This observation is troubling because, as some studies show, individuals with mood disorders will remember their paths differently than those who have never dealt with depression.
A striking clinical feature of individuals who experience major depressive episodes is the overall negative tone with which they refer to their past. When people suffer from depression, there is a systematic autobiographical bias for favoring negative experiences. They have a faster retrieval of negative autobiographical memories rather than positive ones.
How Depression Impacts the Brain and Affects Memory
Depression affects the brain in physical and nonphysical ways. Multiple studies show structural alterations in several subcortical brain regions in patients with major depressive disorder. For example, hippocampal volume reduction is widely seen in patients with depression. Since the hippocampus is your brain’s memory center, it is understandable that these physical alterations to the brain can impact what you remember.
A study done in 2015 shows a link between individuals with depression and their hippocampus volume. The study found that people who had recurrent depressive episodes had a lower hippocampus volume. The effect was observed more in individuals with early-onset depression. Early-onset depression develops before a person is 21 years of age.
Interestingly, the different regions of your brain are linked. If something impacts one region of the brain, it can affect all of them. Processing the emotions connected to depression can affect other parts of the brain that control memory.
Your brain circuits interact via neurotransmitters such as glutamine, dopamine, and serotonin. If these chemicals are too high or too low, this can impact how the neurons communicate, leading to reduced memory processes. Therefore, one theory that explains why depression-related memory loss happens is that depression can lead to stress-induced chemical reactions. These can contribute to the destruction of neurons or the suppression of future neuron growth.
What Is Rumination, and How Can It Affect Memory in Individuals With Depression?
Rumination refers to constantly thinking over an idea, choice, event, or situation. Many studies have evaluated rumination and its links to cognitive susceptibility to negative emotions.
When a person has a ruminative response style, they pay continuous attention to their emotional symptoms. They meditate on the possible causes and consequences of their thoughts and behaviors.
Studies show that ruminative responses can lead to prolonged depression symptoms. The literature also indicates that ruminative reaction styles can affect cognitive behaviors, especially when experiencing stressful events or strong emotions.
Rumination leads to decreased cognitive control, resulting in less flexibility in regulating thoughts and behaviors. An individual with depression may find it difficult to manage thinking patterns, impulse control, and self-reflection. Rumination also absorbs brain space. As a result, there is less room for other thought processes, including memory.
Depression, Sleep, and Memory
Many people battling with depression experience fatigue and changes in their sleep habits. Sleep disruptions can impact cognitive function. There is a link between depression and the imbalance of neurotransmitters that regulate a person’s mood and sleep cycles. The imbalance of neurotransmitters could be why a person who struggles with depression either experiences insomnia, which is difficulty sleeping, or hypersomnia, which is oversleeping or sleeping too much.
Several studies show that too little or too much sleep impacts cognitive function, including visual memory and response time. But the optimal amount of sleepfor the brain to perform at its peak is between seven and nine hours. Sleeping less than seven hours or more than nine hours a night has been shown to lead to impaired cognitive function.
Antidepressants and Short-Term Memory Loss
Antidepressants are powerful tools in relieving depression symptoms. However, some antidepressants, including SSRIs, can lead to difficulty concentrating or short-term memory loss.
Some studies have monitored the effects of SSRIs on patients with depression over the course of several weeks. In these studies, participants had no previous complaints of memory loss. As part of these studies, patients would undergo a mental state examination. They would repeat these examinations at three, five, and eight weeks of treatment. Researchers found that some patients had a lower score on their mental state exam with each consecutive check. This does not mean that individuals should stop taking their prescribed antidepressants. On the contrary, they should continue to take them and discuss their short-term memory loss with their physician or psychiatrist. The physician or psychiatrist may suggest a change in medicine or a medication-free treatment.
Are the Brain Alterations Caused by Depression Permanent?
Research shows that isolated incidents of depression do not typically have a profound long-term effect on the brain. This is especially true if the episodes of depression do not last for several years. However, in adults who are 65 years of age or older, some studies indicate that repeated episodes of depression can predispose an individual to develop dementia.
Diagnosing Depression-Related Memory Loss
When discussing depression-related memory problems, it is important to remember that many things can lead to memory problems besides depression. The aging process, lack of sleep, and medications are just a few factors.
The best way to get appropriate treatment is to understand the reason behind the memory challenges. There are several tests used to identify cognitive issues. During an exam, you may be asked to relate your medical history. Your doctor will look at your psychiatric and medical health history and examine conditions that might run in your family that could lead to memory loss.
Next, a physical exam and diagnostic testing will be performed. This includes taking your vital signs, collecting blood and urine samples, and listening to your heart and lungs.
Your doctor might also perform a neurological exam. During this exam, your doctor will test eye movement, speech, reflexes, and coordination. Your doctor may also perform a brain imaging test.
Your doctor may want to rule out certain conditions such as vitamin B12 deficiency, thyroid problems, multiple sclerosis, Alzheimer’s, or an infection or tumor in the brain. Based on the outcome of the exam, your doctor may refer you to a mental health professional or neurologist to get to the root cause of your memory loss.
Managing Depression-Related Memory Loss
Getting treatment for depression may help you with depression-related memory loss. Some tools that may help with depression-related memory loss include exercise, proper nutrition, cognitive training programs, and psychotherapy. Talk to your doctor to determine if antidepressant therapy is an option for you.
You may also wish to discuss electroconvulsive therapy (ECT) with your doctor. Some studies have shown that ECT can lead to neural growth and reduce atrophy in the hippocampus. Again, ECT does not work the same for everyone.
In addition to working with a healthcare professional, you may take steps to improve your memory at home. These steps may include playing cognitive games on your electronic device or starting a home exercise routine.
Take-Away Information
Depression, a pervasive and complex mental health issue with a global impact, is closely linked to memory loss, affecting up to 40% of cases. However, there are proactive steps you can take to protect and enhance your memory, such as engaging in memory training, ensuring sufficient sleep, getting regular exercise, and considering medication when necessary.
Remember, you have the power to regain control over depression-related memory loss, and assistance is readily available. The National Depression Hotline serves as a valuable resource, connecting individuals dealing with depression to reliable and free support services. This platform can link you with specialists who can pinpoint the causes and triggers of your challenges and help you devise a personalized plan for addressing them. If you are battling depression, contact the National Depression Hotline to see the light at the end of the tunnel.
