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Published in:
2010 | OriginalPaper | Chapter
Modulations in Low-Frequency EEG Oscillations in the Processing of Tactile Surfaces
Authors : Francisco Muñoz, Manuel Sebastián, José Manuel Reales, Soledad Ballesteros
Published in: Haptics: Generating and Perceiving Tangible Sensations
Publisher: Springer Berlin Heidelberg
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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.