Poster Session A11 (Thursday 12:10-2:00 EDT) I will be happy to answer your questions through email (tingtingwang@ku.edu), Zoom (https://kansas.zoom.us/j/4054202415; ID 405-420-2415) and OSF comments! Abstract: Recent studies have suggested that children’s comprehension errors involving the universal quantifier every persist into adulthood and that their errors are modulated by individual differences, calling for further investigation of the origins of adults’ errors and the impact of individual differences throughout development. We examined adult speakers’ processing of every-sentences using the visual-world eye-tracking paradigm, together with measures of vocabulary, executive function, working memory and non-verbal IQ. We found that participants with weaker executive function exhibited erroneous eye movement patterns, findings that are similar to those for children. Our findings thus revealed similarities between children and adults, cautioning against interpreting children’s every-errors as indicative of a non-adult linguistic competence.