CC: Age-Related Changes in Memory May Begin as Early as 50

Scientists at Binghamton University have found that noticeable changes in memory may begin as early as middle age, around the age of 50. As people age, brain activity patterns involved in encoding and retrieving information become less precise, making it more difficult to correctly link details within memories. The findings were published in the journal Cerebral Cortex.

The study included 61 participants: 17 volunteers aged 18 to 30, 21 people aged 50 to 60, and 23 participants aged 61 to 74. The participants were shown faces associated with specific objects or scenes. After a break, they were asked to select the correct pair from several familiar images. The test was designed to assess associative memory — the ability to remember which events or objects are connected to one another.

Memory accuracy gradually declined with age. Younger participants were better at recalling the correct associations, while middle-aged and older adults made more errors. At the same time, the researchers found no significant difference in overall accuracy between the two older groups.

The researchers also examined the activity of the hippocampus — a brain region involved in the formation and retrieval of memories — using functional MRI. Among younger participants, more similar patterns of brain activity during encoding and subsequent recall were associated with better performance. This relationship became weaker with age.

One particularly interesting finding was that in older participants, stronger reactivation of the hippocampus was sometimes associated not with better memory, but with memory errors. The brain could reactivate an overly broad or inaccurate pattern, causing a person to confuse, for example, a scene with an object.

The scientists also investigated whether these changes could be explained by a reduction in hippocampal volume or differences in attention. However, neither factor fully accounted for the observed pattern.

The authors suggest that middle age may represent an important transitional period for memory that has long been overshadowed by research focused on later-life aging. However, the study does not make it possible to determine the exact age at which memory changes begin in any individual person.

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