"These first three reels offer a priceless opportunity to study his visual and narrative ideas when they were first taking shape, " he added.

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Another study metric, called Visual Attention Pattern, also found the iPhone and iPad drawing more attention than rival Android devices.

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Cell-phone conversations and other forms of multitasking may slow down the mental and visual processing required to gauge the distance and speed of oncoming cars, the study suggests.

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The study results could help distinguish between normal and abnormal processes within the visual cortex and identify what parts of the brain are targets for the treatment of anxiety disorders.

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