The ability to perceive visual motion is one of the most fundamental and essential facets of vision. While much has been learned over the years about the psychophysics and neurophysiology of motion processing in adults, little is known about its development in infants. The long-term objective of this research is to characterize the development of visual motion perception in human infants, and to understand how underlying neural mechanisms can account for the progression from an immature to an adult-like state. To this end, visual psychophysical experiments are conducted in infants 1-5 months of age, and the results are modeled in terms of known or hypothetical neural mechanisms. Data are collected from infants using simple observational techniques that rely on the fact that infants preferentially stare at a patterned stimulus rather than a blank field and that infants exhibit directionally appropriate eye movements in response to moving targets. Together, we use these techniques to ask questions regarding the development of: (1) direction and speed discrimination; (2) motion integration across visual space; (3) chromatic (red/green) input to motion processing; and 4) contextual effects on motion processing. The study of infant motion processing is particularly appealing as much is known about the neural basis of motion processing in adults. Thus, discovering the time course of development for different aspects of motion processing will improve our understanding of the neural development of specific visual areas known to be involved in motion processing. From the clinical standpoint, assessment of motion processing capacities could potentially be used to diagnose damage to motion processing areas during development. For example, there is recent evidence that dyslexia (e.g., Livingstone et al., 1991; Galaburda & Livingstone, 1993; Demb et al., 1997; 1998), autism (Spencer, et al., 2000; Gepner & Mestre, 2002; Blake et al., 2003) and Williams Syndrome (Atkinson et al., 1997) are associated with damage to motion-related areas of the brain. In virtue of such findings, it is quite possible that early detection of these disorders could be aided by simple tests of motion processing capabilities. Thus, assessment of the normal development of visual functions, such as motion processing, is likely to play an important role in clinical diagnosis and in monitoring the effects of treatment in infants and children with visual disabilities.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY012153-08
Application #
7034515
Study Section
Central Visual Processing Study Section (CVP)
Program Officer
Oberdorfer, Michael
Project Start
1998-03-01
Project End
2008-03-31
Budget Start
2006-04-01
Budget End
2007-03-31
Support Year
8
Fiscal Year
2006
Total Cost
$338,573
Indirect Cost
Name
University of California San Diego
Department
Psychology
Type
Schools of Arts and Sciences
DUNS #
804355790
City
La Jolla
State
CA
Country
United States
Zip Code
92093
Dobkins, Karen R (2009) Does visual modularity increase over the course of development? Optom Vis Sci 86:E583-8
Dobkins, Karen R; Bosworth, Rain G; McCleery, Joseph P (2009) Effects of gestational length, gender, postnatal age, and birth order on visual contrast sensitivity in infants. J Vis 9:19.1-21