Knowing how the brain processes emotion during REM sleep may open the door to new mental health therapies, say researchers.
Neurons have three key parts, Aime explains – dendrites, axons, and the cell body . Dendrites receive information and send it to the cell body. Then the information is transferred to axons that help send it to other neurons. So, dendrites pull information in, and axons send it out.
But the researchers discovered that during REM, emotional content was stored at the dendritic level, and the “output” part of the cell stopped communicating. “This means that the dendrites, active during REM sleep, provided a substrate for consolidation,” Aime says, blocking any outgoing messages related to danger. Think of it as a game of “whisper down the lane” that stops short when someone receives a scary or negative whisper and doesn’t pass it on to the next person.
Aime calls the mechanism “bi-directional” because different parts of the neuron behave in opposite ways. “This is essential to optimize the consolidation of emotional memories,” Aime says. “Dendrites store information, cell bodies [become] inactive to avoid over-storage.”
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