Where does binding collide?

The physical association of a small molecule, called a ligand, with a specific site on a protein such as a receptor or enzyme, held by weak, reversible interactions and described by an affinity constant (the dissociation constant, Kd) that says how tightly the two stay together. Scatchard's 1949 The attractions of proteins for small molecules and ions set out the quantitative method, still in use, for measuring how many sites a protein offers and how strongly each holds its ligand. The referent is a chemical event between molecules, measured as an equilibrium affinity, and it is not a grammatical rule linking words, the brain's merging of features, or a name tied to a value in a program.[1]

Unit

One ligand-protein association, scaled by its dissociation constant (Kd)

Recovery means

The interaction is reversible: the ligand dissociates and rebinds as concentrations change

Measured by

Quantified by binding assays and equilibrium analysis, for example a Scatchard plot, to find affinity and the number of sites

In generative grammar, binding is the set of structural conditions that govern when one nominal element can, must, or may not take its reference from another element in the same sentence, for example when "himself" must point back to an earlier noun and when "him" may not. Chomsky's 1981 Lectures on Government and Binding formalised these conditions as the binding principles that constrain reflexives, pronouns, and referring expressions. The referent is a rule about how words within a sentence share reference, and it is not a molecule gripping a protein, the brain uniting a percept, or a name linked to a value in code.[2]

Unit

One structural dependency between an element and its antecedent

Recovery means

Not applicable

Measured by

Tested by native-speaker grammaticality judgements across different structural configurations

In perception research, binding is the process by which the brain combines the separately analysed attributes of an object, such as its colour, shape, and motion, into a single unified experience, and the "binding problem" is the question of how this integration happens when those features are handled by different neural populations. Treisman's 1996 The binding problem reviewed the evidence that attention and timing help stitch features together, and the errors, known as illusory conjunctions, that appear when binding fails. The referent is the brain's integration of perceptual features into one object, and it is not a ligand meeting a receptor, a grammatical constraint on reference, or a name attached to a value in software.[3]

Unit

One integrated percept assembled from separate feature maps

Recovery means

Not applicable

Measured by

Probed by attention experiments, illusory-conjunction errors, and recordings of neural synchrony

In programming languages, binding is the association of a name, an identifier such as a variable or function name, with an entity such as a value, a memory location, or a type, and the word also marks when that association is fixed, whether early, at compile time, or late, at run time. Strachey's Fundamental Concepts in Programming Languages, written in 1967 and published in 2000, set out how names are bound to values and how scope decides which binding is in force. The referent is a link between a symbol and a value inside a program, resolved at compile or run time, and it is not a chemical grip on a protein, a rule about pronouns, or the brain's fusing of a percept.[4]

Unit

One association of an identifier with a value, location, or type

Recovery means

Not applicable

Measured by

Determined by a language's scope and lookup rules at compile time or run time