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Duke team explains a longtime visual puzzler in new way
Date:10/13/2008

ories that the effect is a mismatch between systems dedicated to the perception of speed and the perception of position, and also theories of how stimuli are integrated over time.

The researchers measured the flash-lag effect over its full range, with objects moving at different speeds in the field of vision.

Study subjects viewed a projection screen through a hole and used a remote control to reposition an LED (light-emitting diode) light so that it would align with the center of a moving vertical bar of laser light. The vertical bar moved at different speeds.

Purves and colleagues found that the lag time increased in a nonlinear manner as the moving object increased its speed. The empirical relationship between moving objects in a simulated world and their projection onto a simulated retina accurately predicted the function derived in this way.

The study thus showed that the perception of lag is the result of accumulated experience with image speeds, which allows successful visual behavior in response to real-world sources whose speeds and positions cannot be known directly, Purves said.

The lag is present in all normal motion perceptions, but has to be demonstrated in the lab. "We are simply not aware of it since we have no trouble dealing with moving objects," he said.


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Contact: Mary Jane Gore
mary.gore@duke.edu
919-660-1309
Duke University Medical Center
Source:Eurekalert

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