]. Taking these findings into consideration, it is speculated that the interaction in high-gamma oscillatory brain activity observed in BA 45 and 47 is involved in cognitive processes related to eating behavior.
In fact, the extent to which the neural responses to the pictures in the visible condition was different from those in the invisible condition observed in this study was associated with the indices of eating behavior.
The interactions were observed only in high-gamma band frequency. This suggests the importance of high-gamma band neural activity in investigating the conscious and unconscious neural processes related to eating behavior; however, further studies were need to completely understand the differential roles of neural activities in eating behavior between high-gamma band and gamma bands 1 and 2.
This study did have some limitations. First, the participants were all healthy males; therefore, additional studies involving females and/or obese individuals need to be conducted to gain a better understanding of the role of the interaction with eating behavior.
In summary, we confirmed that increased sympathetic nervous activity is induced by viewing food pictures presented below the threshold of awareness, as reported previously [], and that conscious and unconscious neural processes involved differently in the neural processes related to eating behavior.
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