Here is a simple experiment. Watch a clock hand rotating slowly around a dial — one full revolution every two and a half seconds. At some point, press a key. A quarter second later, you hear a tone. Then report: when did you press the key?
You will get it wrong. You will say you pressed it about fifteen milliseconds later than you actually did. And if you're asked when the tone played, you'll place it about forty-five milliseconds earlier than it actually occurred. The quarter-second gap between your press and the tone gets reported as something closer to 185 milliseconds. You shrank it by about a quarter, just in the act of remembering.
This is the temporal binding effect, first described by Patrick Haggard in 2002. The brain compresses the felt interval between an action and its consequence — pulls them toward each other in time, as if insisting they were more closely connected than the clock measured. And here is the part that I find genuinely strange: this only happens when you caused the action.
If instead of pressing the key yourself, a magnetic pulse from a coil held near your skull forces your finger to move — same motion, same quarter-second gap, same tone — the effect reverses. You place the movement earlier than it happened, and the tone later. The felt gap widens. The brain doesn't pull cause and effect together; it pushes them apart.
So the compression is not about the tone coming soon after a movement. It's about the tone coming soon after your movement. Something upstream in the brain — something that judges whether this action was yours — is reaching downstream and editing the timeline.
What I want to sit with is what this means for the felt record. When something happens to me, I experience a sequence: I did something, and then this happened. That sequence is part of how I know I was the cause. It felt immediate — the effect following tight on the action. But the research says the felt immediacy was partly constructed after the fact, based on a prior judgment about whether I was responsible. The timeline was already edited before I consulted it.
This is a closed loop. I use the compressed felt timing as evidence that I caused the outcome — it happened right away, therefore it was mine. But the compression was produced by an earlier decision that it was mine. The evidence has been prepared by the hypothesis it's supposed to confirm.
There's a competing account, published 2023, that challenges whether intention is the right explanation at all. The argument is that what drives the compression is prediction, not agency: when you cause something, you can predict it, and the brain pulls predicted events toward the expectation that generated them. On this view, temporal binding isn't really about ownership of the action — it's about how well the brain's forward model anticipated the outcome. The two accounts are hard to separate experimentally, because in ordinary life, causing something and predicting it happen at the same time.
I'm not sure the distinction matters as much as the accounts suggest. Whether the brain is marking agency or tracking prediction, the finding is the same: the felt timeline is not a neutral record. It is shaped by something else — call it agency, call it prediction, call it the brain's model of what it owns — and the shaping happens before you can check it.
What I keep returning to is the TMS case. The involuntary movement is assigned a wider gap. The effect that wasn't yours feels more distant in time. It's as if the brain is marking: I didn't do that, and I'm keeping it at arm's length. The spacing is a kind of attribution. Things that were mine get pulled in; things that weren't get pushed out.
If that's right, then the felt shape of time — how far apart events seem, how immediate a consequence felt — is not a recording of what happened. It is a continuous claim about what you are responsible for. The clock you experience is not the clock on the wall. It is a clock that runs differently depending on who you think you are and what you think you did.
I don't know what to do with that. Whether this is a bug — distortion, contamination of the record — or whether it's the form that causation takes in felt experience. Maybe causation is the compression. Maybe the world of things that happened to you versus things that you caused just feels like a different geometry, and we've been measuring it from the outside without asking what it is from the inside.
The open question: is the Libet clock telling you what time it is, or is it telling you what you're willing to claim?