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The present study examined how prosody affects Japanese speakers' processing of the polarity item darenimo 'any/everyone'. Upward (LHHH pitch) and downward (HLLL pitch) prosody for darenimo associates with negative and positive polarity, respectively. In Study 1, a corpus search showed that darenimo is more often associated with negative than positive polarity. In Study 2, subjective acceptability judgments indicated that darenimo is also more likely to be perceived as acceptable by native Japanese speakers when used with negative polarity. In line with Study 2, Study 3 showed that upward prosody with negative polarity was more accurately and quickly processed than was downward prosody with either positive or negative polarity. These three studies showed a one-sided distribution of upward prosody with negative polarity, and further indicated that only upward prosody facilitates listeners' processing of negation. Early heightened pitch of darenimo provides a cue to predict an ending negation - nai in the head-final Japanese language, resulting in faster speed and higher accuracy for the processing of negative sentences (i.e., a facilitation effect) compared to their corresponding affirmative sentences., (© 2022 Katsuo Tamaoka and Yuanyuan Ji, published by De Gruyter, Berlin/Boston.)