According to the predictive coding framework, prior knowledge is conveyed…

Question

BlackTom AI · Accepted Answer

Predictive coding treats the brain as a hierarchical Bayesian machine: higher levels encode expectations (priors) and send predictions down, while lower levels compare incoming sensory input to those predictions and send prediction errors back up.

1. Relevant knowledge points and concepts
- Hierarchical processing: cortical areas arranged in layers from lower (sensory) to higher (abstract).
- Priors/predictions vs. prediction errors: priors are top-down expectations; prediction errors are bottom-up signals encoding mismatch.
- Anatomical implementation: feedback (descending) projections carry predictions; feedforward (ascending) projections carry error signals. Lateral connections modulate local computations but do not primarily transmit priors between hierarchical levels.

2. Step-by-step reasoning process
- Predictive coding formalism posits that perceptual inference minimizes prediction errors by updating priors.
- To reduce error, higher areas must supply predictions to lower areas so sensory input can be compared to those predictions.
- Therefore, the transmission route for priors is the descending (top-down) pathway from higher to lower cortical levels.

3. Intermediate logical steps (no numeric calculations)
- Define roles: If priors were sent bottom-up, they could not shape lower-level processing before comparison with sensory input.
- Bottom-up pathways are observed to carry error-like signals; thus they are not the main carriers of priors.
- Lateral pathways influence neighboring units but do not implement hierarchical prior transmission.

4. Why the correct answer is correct
- Because predictive coding explicitly distinguishes descending predictions (priors) from ascending prediction errors, the framework assigns priors to top-down connections. This matches neuroanatomical and electrophysiological evidence for feedback-mediated expectations.

5. Why other options are incorrect
- "Mostly via bottom-up connections": incorrect — bottom-up conveys prediction errors/sensory evidence, not priors.
- "Via lateral connections": incorrect — lateral links modulate local processing but are not the main route for hierarchical priors.
- "Mostly via bottom-up and some top-down": incorrect — reverses the roles; priors primarily descend, not ascend.

6. Conclusion
The correct answer is: via top-down connections. This matches the provided answer.

According to the predictive coding framework, prior knowledge is conveyed…单项选择题

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