What the place-cell and head-direction framework actually maps
The framework describes two kinds of cells that together give an animal a sense of where it is and which way it faces. Place cells fire when the animal is in a particular spot, and head-direction cells fire according to which way the head is pointing, regardless of location [2]. Neighboring brain regions feed into this system, and place-cell firing is strongly shaped by input from the head-direction system, which is how the two signals get tied together into a map-like representation [3].
That representation has been worked out almost entirely at close range. The classic experiments put rats in small enclosures and then change the environment—rotate it, remove landmarks, alter the cues—to see how the head-direction signal responds [4]. This is a map of the space an animal can walk around in and see, built from local landmarks and self-motion. Nothing in that setup requires the animal to find its way across a continent.
Why migration keeps appearing without being tested
Migration shows up in this literature as a reference point rather than a subject of study. A history of head-direction cell discovery notes that the bird migration literature discusses the sense of direction extensively, while the rodent work on head-direction cells treats direction as something separate from place [2]. Similarly, a study of how head-direction and place-cell representations interact points to bird homing and migration as data that bear on the question [4]. In both cases the migration work is cited to frame the rodent findings, not to test whether the same cells do the same job over long distances.
The one line of work that directly connects the cellular machinery to migration is a proposal, not a result. A project aimed at magnetic-field effects on head-direction and place cells set out to ask which of the primary mechanisms for detecting the Earth's field in migratory animals might be at work, and how head-direction cells respond [1]. That framing treats magnetic sensing as a possible input to the head-direction system—a hypothesis about a mechanism, not a demonstration that the near-space map scales up.
What would count as scaling, and why the current evidence doesn't get there
For the framework to scale, the same cells would need to support navigation across distances far beyond a room, presumably using cues that don't depend on local landmarks. The cellular work on the presubiculum—a region central to the head-direction system—lays out how head-direction, grid, and place signals are organized together, and how that organization develops [5]. That is a detailed account of the circuitry behind near-space orientation. It does not address whether those signals carry information at migratory scales [5].
The gap is not a small loose end. A cognitive-map account built from maze experiments explains how place cells and head-direction input produce a spatial representation of an environment the animal explores [3]. Extending that to a journey of thousands of kilometers would require evidence about how the system behaves when the animal is far from any familiar landmark and moving for days or weeks. None of these studies provides that evidence; the migration connection remains a motivating analogy [1][2][4].
So what should a curious reader take away?
The honest answer is that the near-space map framework is well supported for the spaces animals actually walk through, and the migration question is still open. The head-direction system is real and well characterized in rodents [4][5], and its influence on place cells is documented [3]. But the studies that mention migration treat it as a neighboring field with a shared interest in direction, not as a domain where the place-cell/head-direction map has been validated [2][4].
If you want to know whether insects or birds navigate long distances using a place-cell-like map, this body of work does not answer it. What it offers is a candidate mechanism—magnetic sensing feeding into head-direction cells—that someone proposed to test [1], and a clear picture of how direction and place are wired together at small scales [3][5]. The scaling question is a reasonable next step, not a settled finding.
Sources used in this answer
EAGER: Magnetic Field Effects on Head Direction and Subicular Place Cell Responses
Proposes investigating whether magnetic-field detection mechanisms in migratory animals affect head-direction and place-cell responses, framing magnetic sensing as a possible input to the head-direction system.
Foreword: history of the discovery of head direction cells
Notes that the bird migration literature discusses the sense of direction extensively, while rodent head-direction cell work treats direction as distinct from place-cell firing.
The neural basis of a cognitive map
Describes place-cell firing as strongly modulated by inputs from the head-direction system, supporting a model of how the two signals combine into a spatial representation in maze settings.
Head-direction cells recorded from the postsubiculum in freely moving rats. II. Effects of environmental manipulations
Shows that manipulating the environment alters head-direction cell firing in rats, and cites bird homing and migration as related data on how head-direction and place-cell representations interact.
Cellular components and circuitry of the presubiculum and its functional role in the head direction system
Details how head-direction, grid, and place signals are organized together in the presubiculum and how that organization develops, without addressing migratory-scale navigation.