Modulations in Low-Frequency EEG Oscillations in the Processing of Tactile Surfaces
The present study investigated low-oscillatory (theta band, 3-7 Hz) modulations induced by tactile roughness stimulations under two attention-demanding conditions. Four levels of roughness were presented under low-demanding and high-demanding conditions. In both conditions, an oddball paradigm was used to present three target surfaces varying in roughness (low, mid, and high levels of roughness), and a nontarget flat surface. The results showed that centro-parietal theta oscillations are involved in allocating attentional resources when participants have to update new information induced by incoming haptic stimuli. Theta power was higher in the high-demanding task compared to the low-demanding. Furthermore, theta power varied depending on tactile roughness but not in a linear manner. This was interpreted as that theta oscillations were sensitive not only to task difficulty but also to physical properties.
Keywordstactile roughness perception brain oscillations attentional demands theta band
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- 6.Ishii, R., Canuet, L., Herdman, A., Gunji, A., Iwase, M., Takahashi, H., Nakahachi, T., Hirata, M., Robinson, S.E., Pantev, C., Takeda, M.: Cortical oscillatory power changes during auditory oddball task revealed by spatially filtered magnetoencephalography. Clinical Neurophysiology 120, 497–504 (2009)CrossRefGoogle Scholar