Perceptual Grouping & Psychophysical Scaling

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Abstractions about ensemble perception, common fate, ambient awareness, perceptual scaling laws, attribute judgments, and social effects on perception.

10 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Ambient Awareness — Peripheral social knowledge that emerges as many small, recurrent social-media updates accumulate into a coherent sense of other people's activities, moods, interests, and availability without sustained one-to-one conversation.
• Cheerleader Effect — Explain why a face is rated more attractive in a group than alone by ensemble coding — the visual system assimilates each individual percept toward the group's averaged, and thus more attractive, mean.
• Common Fate — Group visual elements that change together — moving, flickering, or co-varying synchronously — into one perceived object, on the inference that things sharing a fate usually share an origin.
• Ensemble Coding — Extract a statistical summary of a set of items in parallel — faster than any individual item can be encoded — and treat that summary as the default percept of the group.
• Psychophysical Scaling — Relate controlled changes in measurable physical stimulation to changes in sensation or discrimination by fitting a modality-specific response law over an explicitly bounded operating range.
• Sequential Clarity — Judge how well each item in an ordered presentation stands out not by its own quality but by how much it contrasts with its immediate temporal neighbours inside the working-memory window.
• Stereotype Threat — The situational performance drop that occurs when a negative group stereotype is made salient in an evaluative setting, consuming the working-memory capacity the task itself requires.
• Stevens's Power Law — Relate the perceived magnitude of a sensation to the physical intensity of the stimulus by a power function ψ = k·I^β, whose modality-characteristic exponent β compresses the sense (β < 1), expands it (β > 1), or leaves it near-linear — recovered as the slope of magnitude estimates plotted on log-log axes.
• Theory of Indispensable Attributes — Identify a perceptual modality's indispensable organizational media by testing which attribute collapses perceived numerosity when its separations are removed, then describe how features group elements distributed over those media into phenomenal partitions.
• Weber's Law — The just-noticeable difference in a stimulus is a constant fraction of the baseline magnitude, not a fixed absolute amount (ΔI/I = k), so a perceiving system compares ratios rather than differences across its dynamic range.