When we have to learn something new, that new information has to get through what you might think of as “gates”: first it has to be perceived, then pass into working (or short-term) memory, and then finally into long-term memory. Moving information from working to long-term memory usually requires rehearsal, like repeating someone’s name to yourself over and over again until you have it memorized. This experiment by Sahan and colleagues shows that the same is true of visual information and answers the question: how exactly do we rehearse visual information? Their answer: we rehearse visual information with help from our eyes!
Abstract
The human eye scans visual information through scan paths, series of fixations. Analogous to these scan paths during the process of actual “seeing,” we investigated whether similar scan paths are also observed while subjects are “rehearsing” stimuli in visuospatial working memory. Participants performed a continuous recall task in which they rehearsed the precise location and color of three serially presented discs during a retention interval, and later reproduced either the precise location or the color of a single probed item. In two experiments, we varied the direction along which the items were presented and investigated whether scan paths during rehearsal followed the pattern of stimulus presentation during encoding (left-to-right in Experiment 1; left-to-right/right-to-left in Experiment 2). In both experiments, we confirmed that the eyes follow similar scan paths during encoding and rehearsal. Specifically, we observed that during rehearsal participants refixated the memorized locations they saw during encoding. Most interestingly, the precision with which these locations were refixated was associated with smaller recall errors. Assuming that eye position reflects the focus of attention, our findings suggest a functional contribution of spatial attention shifts to working memory and are in line with the hypothesis that maintenance of information in visuospatial working memory is supported by attention-based rehearsal.
Citation
Sahan, M. I., Siugzdaite, R., Mathôt, S., & Fias, W. (2024). Attention-based rehearsal: Eye movements reveal how visuospatial information is maintained in working memory. Journal of Experimental Psychology: Learning, Memory, and Cognition, 50(5), 687–698.
Dr Martin Fracker 