Wayward associations: When and why people think of similar-sounding words

Words with similar meanings sometimes sound similar, which carries both risks, such as confusion, and rewards, such as ease of comprehension. It has been argued that languages evolve to balance these competing pressures, so words more often overlap in both form and meaning when they are less likely to be confused. By measuring the phonological similarity of responses to English cues in a word association megastudy, we provide evidence of a tendency to activate similar-sounding words in response to words that reside in sparse semantic neighbourhoods and in response to words for abstract concepts. Crucially, we provide evidence that the availability of similar-sounding associates helps people retrieve and represent the meanings of words from sparse neighbourhoods and words for abstract concepts, as measured by reaction time in semantic decisions and by accuracy in recognition memory. We propose that phonological connections compensate for weak semantic connections when representing word meanings, which we discuss in terms of multiplex networks, models of word-meaning access, and theories of language evolution.