The Name-Leash Hypothesis: Maternal Separation and the Origins of Displaced Reference

How did human communication first escape the "here and now"? The capacity for displaced reference — referring to entities not present in the immediate perceptual environment — is widely recognized as a defining feature of human language (Hockett, 1960), and Bickerton (2009) rightly placed it at the center of the language origins problem. Yet the dominant scenario, which locates displacement in the need to recruit coalition members to distant food sources, does not compellingly explain why an offline representational system would be selected when pointing, leading, and pantomime would suffice.

The Name-Leash hypothesis proposes that the first displaced signal was not a food reference but a proper name — an individualized vocalization addressed to an absent infant. In cooperative breeding contexts characteristic of early Homo (Hrdy, 2009; Burkart et al., 2025), mothers regularly transferred infants to allomothers and departed to forage, generating an irreducible affective pressure — separation anxiety directed at a specific, non-fungible child — that no perceptually grounded gesture could resolve.

The hypothesis identifies a semiotic mechanism for this transition: when the referent of an indexical signal disappears, the index "breaks," creating pressure for a vocal substitute that maintains the referent's mental representation in absence. The proper name fills this role as a repaired index — preserving the singularity of indexical pointing while acquiring the context-independence of a symbol. In Kripke's (1980) terms, the name functions as a rigid designator: it carries no descriptive content requiring environmental verification, making it the only signal type that operates precisely when there is nothing to perceive.

The mechanism is grounded in the physiological platform created by habitual upright walking (decoupled respiration, enhanced vagal regulation), in the neural architecture of invariant identity representation (concept cells; dedicated name-retrieval systems in the left temporal pole), and in the ethology of cooperative breeding. Developmental evidence — the coincidence of peak solitary babbling with separation anxiety, Freud's Fort/Da, and Porshnev's analysis of the first word as self-regulatory — independently supports the proposed dynamic. Comparative data show that the two prerequisites for the mechanism — vocal individuation and vocal mimesis — exist separately in other species but converge only in cooperative-breeding hominins.

The proto-name, born as a tool of affective self-regulation, already carries relational (genitive) structure and functions as an implicit promise of return — suggesting that reference and social obligation may have co-emerged as properties of the same vocal gesture.

Version 2: expanded sections on conventionalization (§6.4–6.7), decomposition and proto-syntax (§10.1–10.6), comparison with Porshnev (§12); Figure 1 updated (extended causal chain through conventionalization, decomposition, proto-syntax, and recursive kinship).