Although this is a very interesting finding, the pMTG activation in their study did not reach statistical significance corrected for multiple comparisons, and as the authors note, this work requires replication.
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The sentences
We tested for effects on the cusp of significance by avoiding cluster correction but did not find any significant differences in brain response.
Finally, our failure to find a lexicality effect in pMTG for tongue twisters suggests that evidence for such an effect trending toward significance in prior research may reflect a false positive result.