This question quietly assumes that a mapping already exists between depth-scale scores and brain images taken during hypnotic amnesia. That mapping is mostly aspirational. The pieces it would require do exist separately, but they have not been joined in the clean way the wording implies.
Start with the scales. Instruments like the Stanford Hypnotic Susceptibility Scale and the Harvard Group Scale measure how responsive a person is to a standard set of suggestions, including suggestions to forget. They are best understood as measures of hypnotic responsiveness rather than of a graded internal “depth,” and researchers debate how much a single number really captures.
The neuroimaging side is real and worth describing accurately. Functional MRI work on hypnosis has reported state-related changes in large-scale networks: reduced activity in parts of the anterior cingulate cortex, altered connectivity between the dorsolateral prefrontal cortex and the salience network, and changed coupling between executive regions and the default mode network, which is tied to self-referential thought. Highly hypnotizable people also tend to show stronger baseline connectivity between the left dorsolateral prefrontal cortex and the dorsal anterior cingulate. These are findings about the hypnotic state and about trait hypnotizability, not about amnesia specifically.
Now the gap. To answer the question as posed, a study would need to score people on a depth scale, induce amnesia in the scanner, and show that the scale scores track a particular pattern of network activity during the forgetting. That combined, replicated result is not something the literature has delivered. Reviewers have noted there is no single neural signature for hypnosis at all, which makes a tidy depth-to-network correlation during a narrow task even less likely.
It helps to separate what is solid from what is assumed:
- depth scales reliably sort people by responsiveness, including to amnesia suggestions
- fMRI shows the hypnotic state shifts attention and control networks
- a validated correlation of depth scores with imaging during induced amnesia has not been established
What the original framing gets wrong is treating proposed mechanisms as confirmed ones. Specific claims that high scorers show reduced hippocampal engagement during forgetting, or that fMRI could pre-screen for hypnotic responsiveness, run ahead of the data. They are reasonable hypotheses, not reported facts.
Two errors bracket the honest answer. It would be wrong to say hypnosis has no measurable brain correlates, because it plainly does. It would be just as wrong to claim a settled, scale-by-network map of induced amnesia, because that map has yet to be drawn.…