Researchers have recently discovered the benefit of forgotten memories, which can still be retrieved with the right cues.
As a child in the early 1980s, I was enamored with My Little Pony, the colorful plastic horse figurines with long manes. I also had the brand’s Show Stable, which was parked in our TV room and filled with my beloved ponies. But as I progressed through grade school, I eventually packed up my stable and forgot about the toys I once loved.
Luckily for me, scientists are continuing to learn where our long-term memories go when they aren’t in use. For people who don’t experience memory loss or other neurological impairments, dormant ones aren’t necessarily forgotten. But they do require the right retrieval cue to be recalled.Scientists have a classification system for different types of memories: two broad categories known as explicit and implicit memories.
The Twinkle-Eyed variety of My Little Pony was not important for my survival, but Bonakdarpour says it must have been emotionally significant and played with on a regular basis. That’s because repeated exposure matters. It’s even possible for a person’s own thoughts to trigger a memory. “Sometimes thoughts bring back concepts and experiences that are related to the past. It’s not an external stimulus, it’s internal. That’s how we troubleshoot as humans — you have a memory for how things worked.”
We can also experience positive associations with certain smells, Igarashi says, since dopamine assists in memory formation. His research has identified how fan cells, which are found in the lateral entorhinal cortex of the medial temporal lobe and controlled by dopamine, are responsible for receiving new associative memories.
As scientists conduct memory research in hopes of alleviating Alzheimer’s symptoms, they have also learned more about memory recall from patients. Bonakdarpour says people with Alzheimer’s and dementia lose their short-term memory and eventually forget their age. “At some point, they start living in their teenage years and they enjoy things from their teenage years,” he says.
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