Prefrontal hemodynamic activation while watching movies H Kojima1, S Kato |
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1Human Sciences, Kanazawa University, Japan
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| Self-referential properties, such as attention, interests, preference, influence the observer’s perception of visual scene. Such properties are related to the functions of prefrontal cortex [Jenkins et al, 2008, PNAS, 105(11), 4507-4512]. We measured hemodynamic changes around prefrontal cortex while observers watched movies, and examined the relationship between the subjective evaluation of the movies and prefrontal activation. Method: Stimuli consisted of twenty silent movies, such as dogs playing, a scene of driving a car, a popular cartoon movie, etc. After a 20 sec resting-time, observers watched a movie for 15 sec followed by another 20 sec resting-time. Then they responded to four questions about the movie on a five-point scale; 1.whether s/he was interested in the movie, 2.wanted to see the movie more, 3.liked it or not, 4.was familiar with the scene. Oxy-hemoglobin change around prefrontal cortex was monitored before to after the stimulus presentation by a 22ch Near-Infrared-Spectroscopy (Hitachi, ETG-4000). Twenty-one volunteers participated in the experiment. Results: The oxy-hemoglobin change generally started to increase before stimulus presentation, presumably reflecting expectations, and to decrease during watching stimulus movies. The magnitude of oxy-hemoglobin change showed inverse correlations with observers’ interests and preferences to the movies, but not with familiarity. |
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