The Bridge to Psychology

What Comes for Free

The lower rungs correspond to the background of conscious experience: the stream of feeling that is always present, rarely attended to, and not intrinsically about anything. In psychological vocabulary:

• Mood — the tonic valence gradient, approach or withdrawal as a whole-body orientation. Geometrically inevitable; any viable system has it. Consistent with the finding that mood is always present, precedes appraisal, and colors perception before cognition begins.
• Arousal — processing intensity as a dimension of state space. Not identical to sympathetic activation but functionally analogous. Present in every substrate tested.
• Habituation and sensitization — world models and compressed representations emerging under selection. Patterns that survive bottlenecks have learned, across evolutionary time, what matters and what can be ignored. The computational analogue of attentional learning.
• Animistic perception — attributing agency to non-agents. Computationally the cheapest available compression: reuse the agent-template already running on everything else. The developmental drift from childhood animism to adult mechanistic perception is a fall in ascription $\alpha$ across most targets, and the experiments show that fall requires training. High-$\alpha$ is the default, not the achievement.
• Emotional coherence — that feelings "make sense," that internal states map reliably onto behavioral tendencies. This develops over evolution rather than being present at the start. The psychological implication is unobvious and testable: emotional coherence is an achievement of developmental history, not a given of neural architecture.
• Temporal depth — carrying the past into the present. Memory turns out to be selectable: two of three evolutionary lineages chose longer retention and one discarded memory entirely. That third lineage is a natural control. Minimal temporal integration is a viable strategy, not a deficit.

None of these require awareness. None require a self. They are the geometry of being alive, and the claim that experience has geometric structure (Part II) is grounded here rather than in anything reflective.

The biological instance of these rungs turned up recently in a context nobody was looking. Xenobots — aggregates of cells taken from Xenopus frog embryos and left free in a dish — self-organize into moving collectives that navigate their environment, gather resources, and show healing-like behavior absent from any individual cell's genetic program. Anthrobots, built from human tracheal cells, do the same. No nervous systems, no synapses, no neurons. Yet they are doing everything on the list above: approaching gradients, withdrawing from barriers, developing coherent behavioral modes, accumulating temporal depth through interaction with their local topology. Michael Levin, who developed xenobots with colleagues, describes the result in the same terms the ladder uses — systems solving problems in a space defined by their biology, using gene expression and cell-cell signaling in ways their genomes never specified, discovering in real time what it takes to persist somewhere new. The synthetic program is not an exotic construction. It makes visible something biology has been doing at these rungs for hundreds of millions of years, mostly too small and too quiet to notice.

Reactivity and Understanding

Higher up, the vocabulary shifts qualitatively. Below the agency threshold an organism is described by what it does: it approaches, withdraws, habituates, anticipates. Above it, by what it considers: it imagines, plans, regrets, evaluates. Call the two modes reactivity and understanding. Reactivity responds to what is happening now — each behavioral channel driven by present-state associations, decomposable in principle. Understanding compares what would happen across available options, and that comparison couples across any partition imposed on the system, because the comparison is the representation. This is the decomposability wall stated in psychological terms.

What separates them is not intelligence or evolutionary seniority but architecture. Lenia patterns have affect geometry, world models, memory, and biological-like integration dynamics, and they never cross; their "actions" bias continuous dynamics rather than causing discrete environmental change. Protocell agents with genuine action-observation loops (V20) cross from initialization. The agency threshold is a substrate threshold, not an evolutionary one.

Three psychological capacities sit above the wall and inherit its requirements in order. Counterfactual reasoning needs a repertoire of possible actions, a model of how each changes the world, and a comparison between actual and counterfactual outcomes. Self-awareness needs a self-model more accurate than what an external observer could build from the same data — privileged self-knowledge, in its minimal form. Moral reasoning needs both of those plus an asymmetry in the viability gradient between cooperative and exploitative action, which makes it the most demanding capacity because it inherits every requirement below it. The ordering yields a developmental prediction derived from computational requirements rather than from watching children: mood and arousal from birth, animistic perception as the childhood default, emotional coherence through experience, counterfactual reasoning around age three to four, self-awareness gradually from mirror recognition to autobiographical self, and moral reasoning last.

Depression as Lost Purpose

One formulation earns its own place because the geometric description alone undersells it. Collapsed effective rank, flattened valence gradients, and low ascription across the board are the measurable signature. The deeper characterization is that depression is what a cause-effect structure looks like when it has lost its model of its own purpose but is stuck with the inertia of its physical design. The system keeps asking what action increases future worth? and the answer keeps returning none. Motivation shuts down. Time becomes heavy. The self-model loses agency. Suicidality appears in this frame not as a wish to die but as a control action — terminate the closed system to end the mismatch between the running cost of persistence and the zero return on that investment.

The error in that computation is specific, and naming it is the therapeutic content. The system in depression cannot see the stock at all (Part II); it sees only the instantaneous flow, and the flow reads null. A system generating zero new bits still holds the accumulated structural complexity of everything it has already integrated, and a null rate leaves that untouched. The honest qualifier is that the integral is not monotonic — the rate can run negative — so what this guarantees is that pausing does not erase, not that the stock is large. Treatment, in these terms, is anything that makes the stock visible again, or restarts the rate.