Symmetry is considered as an important geometric feature impacting object segmentation into parts. It is also noted that partly occluded objects can still be identified according to the remaining visible parts (Winter & Wagemans 2006). In two sets of experiments, we used 13 geometric figures distinguished by symmetry types. In the first experiment, participants (n=52) had to cut the figures into two parts along a straight line and in another experiment, participants (n=44) had to create 5 sets of two figure combinations where the overlapping of the figures was allowed. The results confirmed the importance of the symmetry axis in both tasks. Other relevant criteria were cutting into half (based on angle, edge or area) and precise connecting along edges or corners. This contribution allows comparing the impact of symmetry type on the segmentation and combination of geometric figures. This research is supported by the ERDF grant No 1.1.1.2/VIAA/3/19/506.

Eye tracking is a promising and non-invasive method for assessing cognitive processes in neurodegeneration. Our study focuses on the use of stimulus-driven eye tracking as a tool for discovering neurodegenerative conditions. In this study, we examine perceptual organisation (grouping, segmentation), and accentuation (Pinna & Sirigu, 2011) in neurologically impaired and healthy individuals. Based on a preliminary analysis, there are differences in the average number of fixations between clinical and control groups. Additionally, there are variations in the scanned area within specific sets of stimuli between the control and clinical groups. By identifying these differences, our study contributes to a deeper understanding of the mid-level perceptual processes in neurodegeneration.