What is an exogram in cognitive archaeology?

In cognitive archaeology and cognitive science, an exogram is an external memory trace or symbol that stores information outside the brain. The concept, developed by Merlin Donald, contrasts exograms with engrams (memory traces inside the brain) and covers things like marks, diagrams, writing and artefacts that function as external symbolic storage.

How is the term exogram used for rock art and portable paleoart?

Some researchers, most notably Robert Bednarik, have extended the concept of exograms to palaeoart. In this usage, the earliest rock art, engravings, cupules and portable palaeoart are described as exograms because they are seen as externalised memory traces, bridging internal neural engrams and later symbolic systems.

Why does Eoliths.org not call portable paleoart exograms?

Eoliths.org treats figurative flint tools, portable rock art and figure stones as intentional communication, not just memory off-loading. The placement of motifs, repeatable conventions, directional imagery and their integration with working edges suggest they were made to do something in social space—signal identity, narrate, teach, warn or mark ownership—rather than merely store information as passive exograms.

What does portable paleoart mean on this site?

On Eoliths.org, portable paleoart refers to intentionally modified stones and tools that carry figurative or symbolic imagery and can be carried or handled: flint tools with faces, animals and composite scenes, and figure stones with integrated iconography. These objects are treated as prehistoric art with communicative and social functions, not simply as incidental doodles.

How are portable paleoart, portable rock art and figure stones related?

Portable rock art is a broad label for worked or selected stones that bear imagery and can be moved. Portable paleoart narrows this to prehistoric contexts, and figure stones emphasise natural or worked forms that suggest repeated figurative motifs. On Eoliths.org, all three categories overlap but are grounded in technological and contextual evidence, not in imaginative pareidolia.

Are exograms and portable paleoart mutually exclusive ideas?

They are different analytical frames. Any portable palaeoart object could, in principle, be treated as an exogram if it stores information outside the brain, but Eoliths.org argues that this framing is too thin for flint sculptures and figure stones whose main role appears to be communication, teaching and social signalling rather than simple memory storage.

Exograms vs Portable Paleoart and Prehistoric Art

1. What is an exogram? (Standard definition)

In cognitive science and cognitive archaeology the word exogram is used for an external memory trace – a symbol or mark outside the brain that stores information over time. It is contrasted with an engram, a memory trace inside the brain. Exograms include things like tally marks, diagrams, maps, writing, archives and digital data: structured traces that work as external symbolic storage rather than as mere decoration.

Under this definition an exogram is:

Intentionally created.
Structured enough to carry information.
Available to be re-read or re-used later, outside the original creator’s mind.

Exograms are important to theories of cognitive evolution because they allow off-loading memory into the environment: storing and manipulating information in durable marks, objects and networks rather than only in living brains.

2. How “exograms” are applied to rock art and portable paleoart

Some rock art researchers have borrowed this cognitive-science term and applied it to palaeoart – both fixed rock art and portable paleoart. In this usage, the earliest deliberate markings (cupules, engravings, linear motifs, beads, scratched stones) are treated as the first exograms: external memory traces that bridge the gap between internal neural engrams and later, more explicit symbol systems.

Within that framework:

Rock art panels can be described as exogram fields – surfaces that accumulate marks and stories over time.
Portable paleoart (engraved or modified stones, beads, figurines) becomes a mobile exogram medium that can circulate in a group.
The focus is on memory off-loading and externalisation: how early humans stored information outside their brains.

This is a legitimate research angle at the level of theory. The question on this site is whether calling every figurative flint tool or figure stone an “exogram” actually clarifies, or instead blurs, what is happening in the artefacts themselves.

3. Why Eoliths.org does not call these objects “exograms”

From my perspective, calling the Southdowns assemblage and similar material “exograms” muddies what is actually happening. In the exogram framework, the emphasis falls on off-loading memory into an external record – a kind of cognitive storage technology. But the figurative images in flint tools and other lithics on this site are better understood as intentional, situated communication.

These objects are made to do something to a viewer. They are not simply a way to remember what animals look like, or a private notebook for one brain. They operate in social space.

3.1 From memory storage to communication

If someone engraves an elephant into a tool, it is not primarily so they can later remember what elephants look like. The elephant is already in the shared mind of the group. Instead, the image is placed and shaped to:

Signal identity or affiliation.
Communicate stories, dangers or rules.
Demonstrate knowledge and skill.
Mark ownership or status.
Embed shared ideas into objects that travel between people and places.

That is, these are meaning-bearing artefacts operating in social space, not just memory devices.

3.2 Motifs, conventions and directional imagery

In the Southdowns material and other portable rock art, we see:

Repeatable motifs – the same animal heads, profiles, faces and composite scenes appearing again and again.
Directional ability – figures that can face left or right, up or down, without losing recognisability.
Intercontinental conventions – similar motif grammars appearing on widely separated sites, sometimes separated by millions of years.
Careful integration with working edges – the imagery is not added randomly, it wraps around cutting edges, platforms and striking areas.

All of this is more consistent with purposeful design with an audience – whether that audience is individuals, clans or rituals – than with the idea of a passive memory store.

3.3 Objects that act in social space

Yes, portable paleoart and portable rock art can be “art” in any normal sense – they show skill, play with form, and use aesthetic choices. But the key point here is that their function is active and relational:

They message (“this is who we are”, “this is ours”).
They teach (“this is how the world works”, “this is the animal”).
They warn or invoke (“beware”, “remember this event”).
They carry shared stories across contexts – from camp to camp, from one generation to the next.

Using “exogram” here risks reducing a communicative, culturally charged act into a generic cognitive mechanism. The evidence fits better with deliberate depiction, symbolism and social transmission than with mere external storage.

4. Working terms on this site: portable paleoart, portable rock art, figure stones

To keep things clear, Eoliths.org uses the following working labels:

Portable paleoart – intentionally modified stones and tools from prehistoric contexts that bear figurative or symbolic imagery and can be carried or handled (for example, flint tools with faces or animals carved into their surfaces).
Portable rock art – a broader term for any imagery on stones that can be moved: engraved pebbles, painted stones, carved nodules and so on.
Figure stones – natural or worked stones whose forms and surfaces have been selected or modified to bring out repeated figurative motifs, often poly-iconic and readable in multiple orientations.

All three categories overlap. What matters on this site is that the case for each object rests on technology, context and repeatability rather than on free-floating pareidolia. These are not random “faces in clouds”; they are patterns that recur, obey tool-logic and travel through archaeological contexts.

5. FAQ: Exograms, portable paleoart and prehistoric art

Are all portable paleoart objects exograms?

In the broadest sense, any portable object with meaningful marks could be classed as an exogram – it stores information outside the brain. But this page argues that such a label is too blunt to capture what figurative flint tools and figure stones are actually doing. They behave like messages and symbols, not just like memory devices.

Does rejecting “exogram” mean rejecting cognitive archaeology?

No. The cognitive-archaeology insight that humans externalise thought into marks and artefacts is valid and useful. The disagreement here is narrower: it concerns whether branding portable paleoart as “exograms” helps or hinders our understanding of these objects as social, communicative artefacts.

Is portable paleoart always figurative?

Not necessarily. Some portable rock art may be purely geometric or conceptual. The emphasis on Eoliths.org is on repeated, recognisable motifs – faces, animals, composite figures – that interact with tool geometry and appear again and again in the assemblage, making a strong case for intentional prehistoric art.

How does this relate to the eolith debate?

Eoliths are usually dismissed as geofacts or misinterpreted natural breaks. When the same objects also carry portable paleoart – layered motifs, directional imagery, prepared surfaces – it becomes increasingly implausible to treat them as random fracture. The art side and the tool side reinforce each other; neither is well described by a thin “exogram” label alone.

Where can I see examples of portable paleoart and figure stones?

The best starting points are the Gallery and the Atlas, where you can browse curated examples with contextual notes, zoomable images and references back to classic plates and monographs.