  Embodied conversation agents (ECAs) are increasingly being developed for
older adults as assistants or companions. Older adults may not be familiar with
ECAs, influencing uptake and acceptability. First impressions can correlate
strongly with subsequent judgments, even of computer agents, and could
influence acceptance. Using the circumplex model of affect, we developed three
versions of an ECA -- laughing, smiling, and neutral in expression -- to
evaluate how positive first impressions affect acceptance. Results from 249
older adults indicated no statistically significant effects except for general
attitudes towards technology and intelligent agents. This questions the
potential of laughter, jokes, puns, and smiles as a method of initial
engagement for older adults.
