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Fig. 3. Interruption rate as a function of session. Interruption rate for early
sessions (white bars) and later sessions (dark bars) for the Begin, End and
Random experimental conditions. Interruption rate was lower in the Begin
condition than in either the End or Random conditions, and interruption rate
was lower in later sessions than in early sessions in all three conditions,
however, neither of these trends were significant. Values are means ±
s.e.m. (for number of calls in each condition, see
Table 1).