## 6 General Discussion of Findings  
Experiment 1 summary of findings  
Results from experiment 1 suggest adults rated congruent test events more likely than incongruent test events. These findings suggest that our computer-generated collision events are in line with adults' assumptions of size-appropriate and size-inappropriate distances the cube is propelled to by the small and large ball. Furthermore, the size and congruency interaction further supports this. Adults rated the congruent test events for both sizes higher than incongruent test events for both sizes. For that reason, we conclude that our computer-generated collision events are validated by our adult sample. Experiment 2 summary of findings  
Results from experiment 2 suggest infants distinguished between the sizes by preferring to look at the large ball longer than the small ball. Infants did not differ in their looking times for congruent and incongruent test events. Similarly, infants did not differ in their looking times for congruent and incongruent test events for both a small and large size ball. For that reason, we conclude infants can distinguish between the sizes of the balls but are unable to perceive the size and mass associations in collision events. General discussion of findings  
Results from Experiment 1 validate the use of our version of the computer-generated collision events. Rating differences between the congruent and incongruent test events for large and small ball test events suggest that adults think our collision events are in line with their expectations of these physical events happening in real life. Results obtained from Experiment 2 suggest that 6-to-7-month-old infants are sensitive to size differences across stimuli, indicated by their longer looking time at larger objects irrespective of test conditions (shorter or longer distance the cube is propelled to). The collision events introduced in this paper demonstrated an alternative methodology to [PERSON] and [PERSON]'s [3; 8] version of collision events to examine infants' expectations  
Figure 3: Looking time for small and large ball congruent and incongruent test events. Data are presented as grouped dot plots and mean and 95% confidence intervals. AU = arbitrary units. about object size in collision events. The results obtained with the infants within this paper did not produce results in line with [PERSON] and [PERSON]'s [3] findings. Previous studies that have investigated size in collision events have found a difference in looking time between the large and small ball events in which the cube is propelled to the endpoint of the screen [3,4]. In these studies, both 5.5-6.5 and 10-month-old infants looked longer at the small ball event compared to the large ball event. This suggests that infants find the small ball event to violate their expectations. In line with these findings, we were expecting similar results regardless of the two extra conditions we introduced in which small and large ball propels the stationary object to a short distance. On the assumption that infants use size to infer mass in collision events as concluded by [PERSON] and [PERSON] [3], infants should be able to discriminate between object sizes in the short distance condition similar to the long distance condition found in the study. Based on this assumption, infants should have looked longer at the event in which a large ball propels a stationary object to a short distance compared to a small ball displaying the same behaviour. Instead, we found infants looked longer at large ball events compared to small ball events, irrespective of distance. Large and tall objects may catch infants' attention for several reasons. Larger objects might signal danger (evolutionary hypothesis) or be more prominent. However, past research suggests that despite infants' gradual move from a preference for larger size to more complex features of objects, object size is still vital in their visual preference during the first 12 months of life [13].