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Development of cortical responses to optic flow

Published online by Cambridge University Press:  20 December 2007

RICK O. GILMORE ,
C. HOU ,
M.W. PETTET  and
A.M. NORCIA
RICK O. GILMORE
Affiliation:
The Pennsylvania State University, University Park, Pennsylvania
C. HOU
Affiliation:
The Smith-Kettlewell Eye Research Institute, San Francisco, California
M.W. PETTET
Affiliation:
The Smith-Kettlewell Eye Research Institute, San Francisco, California
A.M. NORCIA
Affiliation:
The Smith-Kettlewell Eye Research Institute, San Francisco, California
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Abstract

Humans discriminate approaching objects from receding ones shortly after birth, and optic flow associated with self-motion may activate distinctive brain networks, including the human MT+ complex. We sought evidence for evoked brain activity that distinguished radial motion from other optic flow patterns, such as translation or rotation by recording steady-state visual evoked potentials (ssVEPs), in both adults and 4–6 month-old infants to direction-reversing optic flow patterns. In adults, radial flow evoked distinctive brain responses in both the time and frequency domains. Differences between expansion/contraction and both translation and rotation were especially strong in lateral channels (PO7 and PO8), and there was an asymmetry between responses to expansion and contraction. In contrast, infants' evoked response waveforms to all flow types were equivalent, and showed no evidence of the expansion/contraction asymmetry. Infants' responses were largest and most reliable for the translation patterns in which all dots moved in the same direction. This pattern of response is consistent with an account in which motion processing systems detecting locally uniform motion develop earlier than do systems specializing in complex, globally non-uniform patterns of motion, and with evidence suggesting that motion processing undergoes prolonged postnatal development.

Keywords

Optic flowDevelopmentV5/MT+HumanInfants
Type
Research Article
Information
Visual Neuroscience , Volume 24 , Issue 6 , November 2007 , pp. 845 - 856
Copyright
2007 Cambridge University Press

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