Which type of memory is most likely affected in those with severe traumatic brain injury?

• A. Short-term memory
• B. Procedural memory
• C. Implicit memory
• D. Long-term memory

Answer: (A)

In cases of severe traumatic brain injury, short-term memory is significantly affected due to the location and extent of the injury. The brain regions primarily responsible for short-term memory, such as the prefrontal cortex and parts of the limbic system, can sustain damage during trauma. This often results in difficulties with holding onto new information for brief periods or recalling recent events.

Short-term memory functions as a temporary storage system for information before it is encoded into long-term memory. After severe brain injury, individuals may find it challenging to maintain attention and focus, which are essential for short-term memory consolidation. Additionally, the disruption of neural pathways involved in immediate recall contributes to these memory difficulties.

In contrast, procedural memory — which pertains to motor skills and tasks learned through repetition — and implicit memory, which involves memory that occurs without conscious awareness, can remain intact because they are primarily associated with more basal ganglia functions and less reliant on the frontal regions that short-term memory relies upon. Long-term memory may also be affected but often remains more stable unless there is extensive damage to the hippocampus or surrounding areas responsible for its storage and retrieval.