> For the complete documentation index, see [llms.txt](https://manymanys.gitbook.io/mm1-lab-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://manymanys.gitbook.io/mm1-lab-manual/procedure/phase-length-and-iti.md).

# Phase length and ITI

### Minimum Phase Length

Subjects receive a minimum of 11 trials per day. The trials must be conducted in a single session (i.e., without interruption). Once a subject reaches the learning criterion in the acquisition phase (e.g., selecting S+ on 9 out of 11 trials), the reversal phase begins as soon as possible.

### Inter-Trial Interval (ITI)

The inter-trial interval is determined by the lab/team/testing site, and must remain consistent. ITIs must be reported to the MM1 Leadership Team.


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