Which neurotransmitter is decreased in Alzheimer's disease and is closely linked to memory processes?

Which neurotransmitter is decreased in Alzheimer's disease and is closely linked to memory processes?

• A. Acetylcholine
• B. Dopamine
• C. GABA
• D. Glutamate

Answer: (A)

A key idea here is that acetylcholine signaling is diminished in Alzheimer's disease and is closely tied to memory processes. Acetylcholine is essential for attention, learning, and the encoding and retrieval of memories. In Alzheimer's, degeneration of the basal forebrain, particularly the nucleus basalis of Meynert, reduces cholinergic input to the hippocampus and cortex, leading to the hallmark memory impairments. Dopamine, while important for motivation, movement, and reward, is not the neurotransmitter most characteristically decreased to explain memory deficits in Alzheimer's. GABA and glutamate play broad roles in neural signaling and plasticity, but the scenario described points to a specific cholinergic deficit that underpins memory problems. Glutamate can contribute to excitotoxicity in the disease, but it is not the neurotransmitter that is characteristically decreased to drive memory decline.

A key idea here is that acetylcholine signaling is diminished in Alzheimer's disease and is closely tied to memory processes. Acetylcholine is essential for attention, learning, and the encoding and retrieval of memories. In Alzheimer's, degeneration of the basal forebrain, particularly the nucleus basalis of Meynert, reduces cholinergic input to the hippocampus and cortex, leading to the hallmark memory impairments.

Dopamine, while important for motivation, movement, and reward, is not the neurotransmitter most characteristically decreased to explain memory deficits in Alzheimer's. GABA and glutamate play broad roles in neural signaling and plasticity, but the scenario described points to a specific cholinergic deficit that underpins memory problems. Glutamate can contribute to excitotoxicity in the disease, but it is not the neurotransmitter that is characteristically decreased to drive memory decline.