Word frequency and cognitive effort in turns-at-talk: turn structure affects processing load in natural conversation.

All four polynomial terms of position were very highly significant (p < 0.001), suggesting that the percentages of hapax nouns out of all words across positions in turns develop across three points of inflection, of which the last sets the stage for a steep rise in percentages of hapax nouns toward turn-final position ( Figure 6 ).

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Post-hoc tests controlling for multiple testing found that speakers show a significant inverse relation of pupil size slope and frequency slope ( p < 0.005) and recipients show a marginally significant direct relation of pupil size slope and frequency slope ( p = 0.08).

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