The effect of oral tactile sensitivity on texture perception and mastication behavior.

Mastication is a notable source of interindividual variation in texture perception and could be linked to oral tactile sensitivity. To better understand the influence of oral tactile sensitivity on mastication behavior, this study measured masticatory behavior and texture discrimination in participants of high (n = 20) and low (n = 21) oral tactile sensitivity. Overall, there was no significant difference between high and low sensitivity participants in their ability to distinguish texture changes (p = .486). However, there were significant differences found between the groups based on their masticatory behaviors including chewing pattern and overall number of chewing cycles. Additionally, those in the high sensitivity group used more stochastic chewing movements, while those in the low sensitivity group were found to use crescent-shaped chewing cycles. It was also noted that in the high sensitivity group, the jaw moved further distances in all phases and moved at a higher velocity when opening but not when closing, when compared to the low sensitivity group. These results show what particular aspects of mastication are most influenced by oral tactile feedback. Chewing patterns have been shown to influence texture and flavor perception, as well as energy intake. However, much of the person-to-person variability in chewing patters comes from unknown sources. This study shows which chewing behaviors are different between a group of individuals with high oral tactile sensitivity and another with low oral tactile sensitivity. These findings highlight the manner in which tactile feedback from the mouth influences chewing.