This study examined the use of elderspeak, a speech register targeted
at older listeners, during a referential communication task. The task
required the listener to reproduce a route drawn on a map following th
e speaker's instructions. Young adults were paired with older adults w
ho performed naturally or who followed a script simulating dementia to
determine if the young adults would modify their fluency, prosody, gr
ammatical complexity, semantic content, or discourse style. When paire
d with older adults simulating dementia, the young adults' instruction
s were longer, more informative, and more repetitious; however, the yo
ung adults did not alter their prosody or grammatical complexity. Toge
ther with previous findings on practice effects on elderspeak, these f
indings suggest that young adults adjust their speech to the perceived
communicative needs of older listeners by varying information content
but not by varying information delivery.