Handwriting Leads to Lasting Changes in Brain Function During Visual Symbol Perception

Abstract

While much research has examined the relationship between action and perception, the mechanisms by which fine-motor actions affect perception remain unclear. Handwriting, a fine-motor skill, improves visual recognition; however, these improvements outlast concurrent changes in communication between relevant brain regions, suggesting that neural communication may not directly support lasting recognition. This investigation evaluates the hypothesis that transient changes in neural communication are followed by changes in brain activation within relevant brain regions for lasting changes in recognition, consistent with the theory of interactive specialization that neural communication fine-tunes localized processing. Fifteen adult participants trained by handwriting unfamiliar symbols and were tested on visual recognition for those symbols on four days within one week. Participants underwent fMRI scans before training, immediately after training, and one week after training; at each scan, they viewed both trained and untrained symbols in a blocked design. Region of interest analyses were conducted within functional communities that underwent changes in neural communication after handwriting training in prior research. Results revealed significant changes in activation at the one-week post-training scan that was not observed at the pre-training and post-training scans. Whole-brain contrast analyses also revealed a significant difference in brain activation, again only at the one-week post-training scan. These results suggest that lasting differences in brain activation emerge after training as the neural communication changes observed immediately after training taper off. Findings suggest that fine-motor actions, such as handwriting, improve visual recognition by first inducing temporary increases in neural communication, followed by a refinement of activity into specialized activation patterns, supporting sustained perceptual and behavioral changes.