Cumulative level test: Mechanisms, representations, and the logic of neural evidence

Check understanding, separately from reading

12 questions · 80% to pass · no timer. This longer test revisits both units in the level. These authored questions assess recognition and application of the taught distinctions, not professional qualification. You may review the lessons and retry. Repeat attempts reuse the question bank; a remembered answer is not proof of transfer to a new situation.

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Question 1

A learned cue now evokes a larger EPSP, but the postsynaptic cell still does not fire when other inputs arrive late. Which combined explanation is defensible?Synaptic efficacy increased while the integration conditions still failed to reach spike threshold.A potentiated synapse must generate a postsynaptic spike regardless of timing or membrane state.

Question 2

An inhibitory conductance suppresses coincident excitation, yet the associated region shows a positive BOLD contrast. Is that a contradiction?Yes; positive BOLD means all local synaptic influences must be excitatory.No; target-cell inhibition and a vascular population contrast describe different properties.

Question 3

A decoder distinguishes edge positions from ganglion-cell activity but stops working when the contrast pattern changes. What should be investigated before claiming an abstract edge code?Whether receptive-field responses and the decoder generalize across the changed contrast conditions.Whether each successful trial proves that one ganglion cell stores the complete visual scene.

Question 4

A hippocampal pattern is reinstated during recall, and a synaptic study separately demonstrates LTP. What additional claim remains a hypothesis?That synaptic plasticity and distributed retrieval are legitimate topics for neuroscience.That the specific observed potentiation implements indexing for the recalled event.

Question 5

A drug prevents a later EPSP increase but also strongly weakens baseline transmission. Why is the claim of selective induction blockade uncertain?Reduced general transmission may prevent the induction conditions rather than selectively targeting the plasticity step.Any drug-induced change automatically identifies a unique molecular mechanism.

Question 6

An experiment finds stronger BOLD during contextual recall than during visual matching and calls the region an exclusive episodic store. Which revision is best?The image directly photographs the recalled event and proves that no other region participates.The region showed a task-related vascular contrast; exclusivity and literal storage require additional evidence.

Question 7

A researcher abolishes a retinal surround response while preserving center responses, then restores it with a targeted rescue. What follows most reasonably?The convergent manipulations strengthen a causal account of surround processing, subject to specificity checks.The findings prove that every perceptual illusion uses exactly this molecular pathway.

Question 8

A classifier trained on two instructed mental tasks predicts their labels well, while an intervention on the recorded region leaves performance unchanged. Must one result be false?Yes; anything an analyst decodes must be necessary for behavior.No; decodable information does not establish necessity, and a null intervention also has limits.

Question 9

Training improves practiced-item accuracy and changes a hippocampal BOLD contrast. Which proposed follow-up most directly addresses durable transfer rather than a synaptic mechanism?Use delayed unpracticed-item assessment with a suitable active comparison condition.Rename the observed BOLD difference NMDA potentiation without changing the design.

Question 10

Two excitatory pathways are equally active overall, but only the one coincident with strong postsynaptic depolarization potentiates. How do integration and plasticity jointly explain this?The total number of active pathways alone determines potentiation of every synapse.Timing shapes the membrane state that enables a coincidence-dependent induction process.

Question 11

A partial cue fails to elicit recall after a disruption, but complete-cue recognition and simple perception remain intact. Which conclusion balances evidence and uncertainty?The pattern supports a selective contribution to cue-dependent retrieval, without proving stored content was erased.The missed recall proves that all distributed memory content was permanently destroyed.

Question 12

A final report combines a retinal circuit experiment, a monkey BOLD calibration study, and human training behavior as proof of one universal learning mechanism. What should an evidence memo do?Treat the number of different methods as proof that every inferred link is correct.Assign each result to its preparation and claim, then identify untested bridges across mechanisms, species, and tasks.

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