optic flow

Compiled with AI assistance and selectively reviewed. Please consult the cited passages; the books remain the authoritative source. About this companion

Editorial synthesis · provisional

Definition

Optic flow is the structured change in the visual array associated with relative movement between perceiver and surroundings. RB2 uses driving, infant locomotion and vehicle learning to show how such patterns guide action while movement alters the patterns available. Flow is relational information within skilled control, rather than a fixed retinal picture, an infallible depth estimate or a complete explanation of every perceptual task.

Explanation

The direct driving example links the apparent motion of the road scene to steering. The driver’s action changes subsequent flow, so the information is part of a circular relation rather than a passive movie watched internally. RB2 includes other higher-order optical patterns without making all of them identical to optic flow.

The infant-learning discussion connects optical and proprioceptive information with calibration to the child’s current abilities. Adult bicycle and vehicle examples similarly require practice and sensitivity to controller dynamics. This supports a source-grounded role for attunement rather than the assumption that merely receiving moving images produces accurate locomotor skill.

Lee’s tau is a more specific relation involving relative image expansion and projected contact time. It is not synonymous with the whole field of optical flow. The proposed subentry preserves that distinction and the wider ecological debate, without assigning a unique numerical value, universal decoding algorithm or guaranteed distance estimate absent from the source.

Scope and attribution

Retain relative movement, feedback, learning and vehicle dynamics without inventing numerical measures or universal decoding rules.

RB2 — The Real Book, Volume II: Becoming Is Being

Flow patterns participate in locomotor feedback and learned calibration; tau remains a specific distinct variable.

Occurrence locators: 65, 66, 73, 74.

Background used in the editorial explanation

Optic flow is distinguished from generic affordance learning; tau remains a specific optical relation.