Wattam-Bell J, Nyström P, Braddick O, Birtles D, Atkinson J, Rosander K, von Hofsten C, 2007, "High-density VERPs to global form and motion in adults and infants" Perception 36 ECVP Abstract Supplement
High-density VERPs to global form and motion in adults and infants
J Wattam-Bell, P Nyström, O Braddick, D Birtles, J Atkinson, K Rosander, C von Hofsten
Sensitivity to global form and global motion are presumed indicators of ventral- and dorsal-stream processing, respectively. We have studied the development of the two streams with high-density (128 channel) VERPs, to explore topographic differences in the responses to global form and motion. The form stimulus had dots arranged in short concentric arcs giving a static global circular pattern. The motion stimulus dots moved along similar arcs, producing global rotation. These patterns alternated at 2 Hz with randomly arranged dot trajectories with no global structure. Adults showed posterior responses to form and motion with significantly different topographies. Of thirty 3 - 5-month-olds, 60% showed motion responses, while only 20% showed a form response. In infants showing responses to both, there was, as in adults, a significant difference in the topography. Global form and motion responses have distinct scalp distributions, implying distinct neural sources, in both adults and infants. The high-density multichannel method opens the possibility of tracking developmental changes, and the effects of perinatal risk factors, in the relationship between these sources.
[Supported by the UK Medical Research Council grant number G0601007, and the Swedish Research Council.]
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