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Traumatic Memory

Traumatic Memory

Emotionally traumatic events often lead to memories that are exceptionally vivid and enduring, sometimes persisting with remarkable clarity throughout an individual's life. A classic example of this phenomenon is a person who survives a car accident. Even years later, they may recall every detail of the event with startling accuracy — the screeching of the tires, the jarring impact, and the acrid smell of burning rubber. Such vividness contrasts sharply with how an individual remembers mundane...

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Controlled Cortical Impact Model for Traumatic Brain Injury

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Trauma-Exposed Adolescents Show Reduced Cortical Glutamate Modulation during Inhibitory Control with Negative

John McClellan France, Dalal Khatib, Shaurel A Valbrun

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Summary

Childhood trauma impacts cognitive control in adolescents. Higher trauma exposure was linked to altered dorsal anterior cingulate cortex (dACC) glutamate levels during emotional tasks, suggesting neurochemical changes affecting brain function.

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Area of Science:

Neuroscience
Psychiatry
Neuroimaging

Background:

Childhood trauma exposure (TE) is linked to heightened negative emotions, impaired cognitive control, and increased anxiety disorder risk.
Cognitive control relies on dorsal anterior cingulate cortex (dACC) glutamatergic (Glu) neurotransmission.
Investigating dynamic dACC Glu levels via ¹H functional magnetic resonance spectroscopy (¹H fMRS) can reveal impacts of emotional processing on cognitive control in youth with TE.

Purpose of the Study:

To assess the impact of negative emotional processing on cognitive control mechanisms in adolescents with a history of trauma.
To investigate dynamic changes in dACC Glu levels using ¹H fMRS in relation to trauma exposure and emotional stimuli.

Main Methods:

Fifty adolescents were divided into Higher and Lower childhood trauma exposure groups.
¹H fMRS measured dACC Glu modulation during an inhibitory motor control task with emotional (Faces) and non-emotional (Squares) stimuli.
Task involved selective and non-selective response modes to assess cognitive control under different conditions.

Main Results:

A significant interaction between trauma exposure group and stimuli condition was found (p=0.031).
Adolescents with higher TE showed significantly lower dACC Glu modulation during emotional (Faces) compared to non-emotional (Squares) stimuli (p=0.023).
Within the higher TE group, Glu levels were significantly reduced during emotional stimuli processing.

Conclusions:

Trauma exposure group differences in adolescent dACC Glu modulation were evident during cognitive control with emotional stimuli.
¹H fMRS is valuable for detecting trauma-related differences in task-related excitatory neurochemical dynamics.
Findings highlight neurochemical alterations in dACC associated with emotional processing and cognitive control deficits in adolescents with childhood trauma.