Memory

Repetition helps transform fragile memory into durable memory. Intellectual engagement can support memory by stimulating the brain. Short-term cortisol can strengthen emotionally significant memories, while chronic exposure has the opposite effect. Confidence and vividness do not guarantee memory accuracy. The hippocampus has one of the brain's highest concentrations of cortisol receptors. Human memory is reconstructive rather than a perfect recording of life events. Long-term memory involves anatomical synaptic change driven by altered gene expression. Retellings, omissions, embellishments, and stories from others can reshape later memories. Short-term memory involves temporary functional synaptic change rather than necessary anatomical remodeling. Emotion can affect which memories are retrieved and can impair how an event is stored. Meaningful or emotionally important experiences are more likely to persist as memories. Pleasurable and traumatic memories both involve synaptic-strength changes, but they use different systems. Sustained glucocorticoid exposure is described as causing measurable atrophy of hippocampal neurons. The article states that cortisol-associated hippocampal…