In 1931, Norman Maier designed an elegantly simple experiment about human reasoning. Subjects entered a large room at the University of Chicago where two cords hung from the ceiling: one near the wall, the other from the center of the room. Their task was to tie the ends of the two cords together.
The catch was that the cords were too far apart. If a subject held one cord, the other was out of reach. The room contained objects that could help: chairs, poles, clamps, pliers, extension cords, tables. Maier was not interested in whether people could find any solution. In fact, several solutions were available. A person could anchor one cord to a chair and bring the other over. They could lengthen one cord with an extension cord. They could pull one cord closer with a pole.
But Maier was especially interested in a fourth, less obvious solution: tie a weight to the cord in the center of the room, set it swinging like a pendulum, grab the other cord, and catch the swinging cord when it returned. This kind of solution requires a shift from viewing a cord not as a cord, but as a pendulum. These kinds of mental shifts are interesting because they often lead to more creative solutions.
Once a subject found one solution, Maier simply said, “Now do it a different way.” The experiment continued until the person either discovered the pendulum solution or became stuck. If the subject worked for at least ten minutes and insisted there was no other way, Maier introduced what he called “helps.” The first help was subtle. The experimenter walked across the room, brushed the center cord, and set it slightly in motion. The subject was not told that this was a hint. If that failed, the subject was handed a pair of pliers and told there was another way to solve the problem using them.
The results fell into three groups. The first group discovered the pendulum solution without help. The third group failed to find it even after help was given. But the second group was the most revealing one as they solved the problem only after receiving Maier’s hints.
With this group Maier could compare what had objectively influenced the solution with what people consciously reported afterward. The hint had often worked. In fact, the solution appeared on average only 42 seconds after the effective help was given. Yet many subjects did not identify the swinging cord as the cause of their insight.
Instead, they produced explanations that sounded plausible. One said, “It just dawned on me.” Another thought that a course in physics may have suggested it. A psychology professor reported thinking of “monkeys swinging from trees.” These were not necessarily dishonest answers. They were stories constructed from what was available to consciousness.
Maier’s own conclusion was that when a solution finally appears, “the cue which sets it off is not consciously experienced.”
Maier’s study was about the hidden architecture of human judgment. We often know what we decided and we can usually offer a reason. But we may not know what moved the rope.
The Mind’s Coherent Narrative
Nearly half a century later, psychologists Richard Nisbett and Timothy Wilson gave this phenomenon one of its most memorable descriptions: people often “tell more than they can know.” Their argument was that we have access to some mental content: our feelings, beliefs, images, intentions, and fragments of thought. But we often do not have direct access to the cognitive processes that produce our judgments.
So when someone asks, “Why did you choose that?” the mind does something useful but often incorrect. It generates an explanation that sounds reasonable and may even contain part of the truth.
But it is not necessarily a faithful transcript of the decision process. It is more like a press briefing after a complex geopolitical event. A spokesperson stands at the podium and offers a coherent account. The account may be polished but is a simplified version of the more complex reality.
The same happens inside our minds. We take one or two visible causes and elevate them into “the reason.” We say the strategy was selected because of market opportunity or that the candidate was hired because of their leadership presence.
Sometimes those explanations are right. Often, they are incomplete. And occasionally, they are beautifully wrong.
Reasons That Sound Right
One of the most important patterns in this research is that people tend to explain decisions using reasons that are socially available. By “socially available,” I mean reasons that are easy to defend and likely to be accepted by the audience.
This matters because many real influences are hard to confess or hard to detect. A person rarely says, “I trusted him because he reminded me of myself.” Or, a team rarely says, “We preferred the familiar option because uncertainty made us anxious.” Instead, we reach for explanations that sound objective, competent, and culturally approved.
We emphasize one or two dimensions and ignore others that may have played a larger role.
This is not necessarily a moral failure but a cognitive one. In a choice blindness experiment, researchers showed participants two options, such as two faces, and asked them to choose which they preferred. Through a sleight of hand, the researchers sometimes gave participants the option they had rejected and asked them to explain why they had chosen it. Many participants did not notice the switch. Instead, they confidently explained why they preferred the face they had not actually selected.
The mind did not say, “Something is wrong here.” It said, “Let me explain.”
This also helps explain why our reasoning so often has a persuasive quality. Hugo Mercier and Dan Sperber have argued that human reasoning may have evolved less as a truth-finding machine and more as a social tool for argumentation. Reasoning helps us justify ourselves, challenge others, and coordinate within groups. In other words, reasoning evolved to improve communication and coordination. But internally, the process of inference is very different from what the external argument we make.
The AI Mirror
This brings us to artificial intelligence.
When a large language model gives an answer and then explains its reasoning, we are tempted to treat the explanation as a window into how the answer was produced. This temptation grows stronger when the reasoning is step-by-step, articulate, and professionally formatted. It feels like the model is transparent and showing its work.
But recent research on chain-of-thought reasoning suggests that this confidence can be misplaced. Models can produce explanations that are plausible but unfaithful. In one experiment, researchers introduced hidden biases into prompts, such as making a particular answer option more likely. The model’s final answer changed, but its explanation often failed to mention the true influence. Instead, it rationalized the answer after the fact.
This is the AI version of Maier’s rope.
Why does this happen? AI has been trained on vast amounts of human language, and human language is full of post-hoc justification. The model learns what explanations sound like. It learns which reasons tend to accompany which conclusions. It learns the socially available vocabulary of justification like efficiency, fairness, or customer value.
In that sense, AI mirrors one of our oldest habits. When the real causal path is inaccessible or difficult to articulate, produce a reason that is coherent, acceptable, and close enough to the surface.
Navigating Reasoning Hallucinations
Both humans and AI can produce narratives that are coherent without being causally faithful. Both can overemphasize one or two salient dimensions while ignoring other (and potentially larger) variables. Both can justify a conclusion using reasons that are more available than accurate.
This creates a new kind of risk. We may begin outsourcing not only analysis to AI, but also justification. A model recommends a course of action, summarizes the rationale, and the rationale sounds reasonable. The explanation appears to increase transparency but if the explanation is unfaithful, it may instead increase misplaced confidence.
The answer is not to reject human intuition or AI reasoning. The answer is to treat explanations differently.
An explanation should not be seen as the end of inquiry. It should be treated as a hypothesis about causality. When a person says, “I chose this because of X,” we should hear, “X is the reason currently available to me.” When an AI says, “The answer is Y because of these steps,” we should hear, “Here is a plausible reconstruction that may or may not reflect the actual basis of the output.”
For humans, that means comparing stated reasons with behavior, context, incentives, and patterns over time. For AI, it means testing explanations against interventions. Does the answer change when irrelevant details change? Does it remain consistent when the same question is reframed?
The great irony of our time is that in building intelligent machines, we have inadvertently created a perfect explanatory mirror of ourselves. We built systems that generate language, and language is where human reasoning most often performs its magic trick. We tell the story we can live with, and that story serves a vital purpose: it allows for coordination, communication, and forward momentum in communities. But we also need to accept the limits of that story. Progress depends on knowing when the language that comforts us and allows us to coordinate is not the same as the underlying, unarticulated process that actually moved the rope.
