Past research has shown that older adults' reduced inhibitory control causes them to hyper-bind, or form erroneous associations between task-relevant and -irrelevant information. In the current study, we aimed to extend hyper-binding to a novel, implicit memory paradigm. In two experiments, participants viewed pictures of objects superimposed with text and their task was to make speeded categorization judgments about the objects. The encoding phase contained three blocks that varied the potential for binding: no-binding, some-binding, and full-binding. During the no/some-binding blocks, participants decided if the pictured object alone could fit inside a common desk drawer while ignoring the superimposed text. In the no-binding block, the text was a nonword; in the some-binding block, it was an object word. During the full-binding block, participants attended to both the picture and word and decided if both items could fit inside a drawer together. After a delay, participants completed the test phase during which they viewed intact and rearranged pairs from the three encoding blocks and decided if both items could fit in a drawer together. In both experiments, older adults responded faster to intact than rearranged pairs from both the some-and full-binding blocks, suggesting that they had learned both targettarget and target-distractor pairs. Young adults showed no difference in RTs to pairs from either block. These findings suggest that the binding mechanism itself is spared with age; what declines instead is inhibitory control, which serves to limit attention, and ergo binding, to task-relevant information.iii Acknowledgements I would like to thank Dr. Campbell for her constant support and mentorship over the last two years. I have become a much better researcher because of her knowledge, expertise, and the time that she dedicates to her graduate students. I am thankful every day that I was able to complete my degree in her lab. Thank you to my committee members Dr. Emrich and Dr. Mahy for their invaluable insight and support. I would like to thank Sarah Henderson for being an amazing teammate and a sounding board. I could not have asked for a better office-mate and friend to enjoy the highs and lows of graduate school with. I could not imagine the next four years of my Ph.D. without her partnership (and "sad" afternoon muffins). This research could not have been done without Amy Holliday who poured hours of her time into calling older adults, training research assistants, and going above and beyond her responsibilities to help with this project. Finally, thank you to all members of Campbell's Neurocognitive Aging lab, extended BUCAN Lab, and the Face Perception Lab, who all piloted experiments, helped with programming, tested participants, searched for older adults in parking lots, made fresh coffee in the morning, and shared intel on free food from 600F.
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