Title: Identification of Brain Activity Patterns in Tactile Information Processes
Speaker: Dr. Junsuk Kim (IBS Center for Neuroscience Imaging Research, Sungkyunkwan University)
Date: Nov. 12, (Mon.), 2018
Time: 05:00 PM
Location: Woo Jung Information & Communication bldg., Room 601
Hosted by Dept. of Brain & Cognitive Engineering, Korea University / Institute of Brain and Cognitive Engineering, Korea University / BK21+ Global Leader Development Division in Brain Engineering, Korea University / Interdisciplinary Major in Brain and Cognitive Science
The perception of surface texture is of great importance to interact with the environment in our daily life. Since most natural objects are characterized not only by its shape but also by its surface texture, a precise tactile perception with one's hands plays an essential role in object recognition and manipulation. To date, a number of psychophysical studies have investigated how humans perceive surface texture properties. However, it remains largely unknown about the neural substrates underlying surface texture perception.
In this colloquium, I will introduce two recent fMRI studies. The first study investigated the neural underpinnings of the perceptual grouping of vibrotactile frequencies. The searchlight pattern analyses showed that vibrotactile frequency information could be decoded from neural activity in the contralateral postcentral gyrus and supramarginal gyrus. Follow-up categorization analyses revealed that the neural activity patterns in these regions may be closely related to perceptual grouping of vibrotactile frequency. The second study examined neural activities dependent on stickiness perception using two different stimulation types: touch a sticky surface with a bare and a gloved hand. As results, the postcentral gyrus, the posterior parietal cortex, the supplementary motor area, and the bilateral insula play important roles in stickiness information processing regardless of the stimulation types.