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.
Miall RC, Gowen E, Tchalenko J. Drawing cartoon faces a functional imaging study of the cognitive neuroscience of drawing, Cortex (2008), doi:10.1016/j.cortex.2007.10.013
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 plans.
Finally their work shows that brain imaging, in combination with eye and hand tracking, can dissect complex visually guided tasks into separate functional stages.
This work is an important step towards a full understanding of how sensory information is used to guide actions. The implications are that the brain translates sensory information into action plans as soon possible, rather than maintaining and later copying from a mental image.
Article: "Drawing cartoon faces – a functional imaging study of the cognitive neuroscience of drawing" by Emma Gowen, R. Chris Miall and John Tchalenko, Cortex, Volume 45, Issue 3 (March 2009), Elsevier in Italy. doi:10.1016/j.cortex.2007.10.013