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The brain 'joins the dots' when drawing a cartoon face from memory
Date:3/19/2009

Milan, Italy, 19 March 2009 - In a study by Miall, Gowen and Tchalenko published by Elsevier, in the March issue of Cortex (http://www.elsevier.com/locate/cortex), a brain scanner was used to record the brain's activity in each stage of the process of drawing faces. The researchers found that the captured visual information is stored as a series of locations or action plans to reach those locations. It is as if the brain remembers key locations and then "joins the dots" with a straight or curved line to achieve the desired image on the page.

Participants who had no particular expertise as artists were studied using an MRI scanner to measure levels of oxygen in the brain. They viewed black and white cartoons of faces and were asked to reproduce them using pencil and paper.

The results show that looking at the cartoons activated visual processing areas of the brain, that are known to be responsive to faces, especially if the cartoon was displayed at the same time as they produced the drawing. But when the subjects had to wait before drawing, there was no maintained activity in these areas. This suggests that the memory of the cartoon face is transformed into a different, non-visual form. Instead, there was increased activity in parietal cortex and frontal areas consistent with the encoding and retention of the spatial information as an action plan, representing a series of targets for ocular fixation or as spatial targets for the drawing action.

In other experiments, the scientists have also precisely measured where people look as they perform these tasks. They conclude that facial information is captured during a sequence of eye movements towards certain features of the cartoons, and the information is stored as spatial locations for subsequent eye and hand actions. The drawing process then recreates these spatial features as the eye and hand are guided by the retained action pla
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Contact: Valeria Brancolini
v.brancolini@elsevier.com
39-028-818-4260
Elsevier
Source:Eurekalert

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