Probing the link between space and number: influence of perceptual flanker variation in line bisection tasks

This study investigated the spatial-numerical association in adults using four versions of a line bisection task with central lines flanked by numerical stimuli in symbolic or non-symbolic formats. Results indicated a bias towards the dot matrix of numerosity 8 when flankers differed, irrespective of their position, but no bias when lateral flankers were identical, regardless of format. In conclusion, the experiments demonstrated a significant influence of the perceptual characteristics of lateral flankers on line bisection performance involving numerical information.