Which of the following statements represent/s evidence that synaptic plasticity among engram cells is involved in memory processing?

Question

BlackTom AI · Accepted Answer

NMDA receptor dependence provides a direct mechanistic link between synaptic plasticity and memory encoding, and this principle underlies why “All of the above” is the correct choice.

1. Relevant knowledge points and concepts
- Engram cells: neuronal ensembles whose activity encodes a specific memory.
- Synaptic plasticity: activity-dependent changes in synaptic strength (e.g., LTP/LTD).
- NMDA receptors: required for calcium influx that triggers plasticity and many forms of memory encoding.
- Protein synthesis dependence: late-phase LTP and memory consolidation require new protein synthesis.
- Correlations between behavioral memory strength and synaptic modifications among engram cells support a causal role for plasticity.

2. Step-by-step reasoning
- Option (a): Both memory processing (encoding/consolidation/retrieval) and synaptic plasticity are triggered by neuronal activity. This establishes shared dependence on activity, consistent with plastic changes mediating memory.
- Option (b): Numerous experiments show NMDA receptor blockade impairs the formation of many memory types and prevents LTP induction. This molecular overlap points to the same mechanisms being necessary for both processes.
- Option (c): Late-phase LTP (maintenance of synaptic changes) and memory consolidation require de novo protein synthesis; pharmacological blockade of protein synthesis disrupts both.
- Option (d): Empirical studies demonstrate that stronger memories correspond to larger or more persistent synaptic potentiation among identified engram cells, indicating a direct correlation.

3. Calculations/intermediate steps
- No numerical calculations are required. Logical chaining: activity → NMDA activation → Ca2+ signaling → protein synthesis-dependent plasticity → persistent synaptic change → memory encoding/robustness.

4. Why the correct answer is correct
Each listed statement provides independent experimental or mechanistic evidence linking synaptic plasticity at engram cell synapses to memory processes. Together they form a convergent set of findings that make the comprehensive statement (“All of the above”) accurate.

5. Why other options are incorrect
None of the individual options are incorrect; each is a true, experimentally supported claim. Therefore no single option alone is the complete picture, and “All of the above” best captures the full evidence.

6. Conclusion
All four specific statements are valid pieces of evidence that synaptic plasticity among engram cells is involved in memory processing. Final answer: All of the above.

Which of the following statements represent/s evidence that synaptic plasticity among engram cells is involved in memory processing?单项选择题

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