Sony ERS-312 - Manual (Page 74)

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If you cannot register a name
If you are to register a name that is same as or similar with another word or action
name AIBO already knows, or if AIBO cannot hear you due to noise, AIBO lets
you know with shaking its head that it cannot register the name you said. If you
failed to register a name three times, AIBO lowers its head to show you its
disappointment, and then finishes the current training.
To name the action registered during action registration
Tell AIBO “Action number xx” at Step 3 (on page 72). When AIBO shows the
corresponding action, proceed to Step 4.