The analysis of brain activation during judging the motion of different velocity

Human visual system has been frequently studied. Anatomical and physiological investigations indicate functional streams within the extrastriate visual cortex of the macaque monkey. It shows that V5 area participates in motion perception. However, the region participating motion judgment was not very investigated. In this paper, we tried to reveal the region of motion judgment. We used functional magnetic resonance imaging (fMRI) to explore. The short videos of moving ball (lasting 1 s to 5 s) and stationary ball (lasting 1 s to 5 s) were prepared. And the pair of moving and stationary balls with same duration was selected and they were randomly presented to subjects repeatedly. Each paradigm consisted of two main conditions (control and activation condition). During control, subjects continued tapping regardless of stimuli. During activation condition, subjects tap only when the video of moving ball was presented (motion judgment). When subjects judge motion, activity was revealed in frontal cortex (Brodmann 9). And the intensity of activations was changed with the duration of presented movie pair. In general, shorter movie pair was selected, intensity became larger.