Article

Orientation and motion-specific visual cortex responses in infants born preterm.

Department of Experimental Psychology, University of Oxford, Oxford, UK.
Neuroreport (impact factor: 1.66). 12/2007; 18(18):1975-9. DOI:10.1097/WNR.0b013e3282f228c8
Source: PubMed

ABSTRACT Orientation-specific cortical responses develop earlier in infancy than motion-specific responses. The maturation of orientation-reversal and direction-reversal visual evoked potentials was evaluated in 17 healthy, low risk, preterm infants (born <32 weeks gestation), compared with a group of 26 infants born at term. Both groups were studied at a corrected age of 2-4 months. The age function and magnitude of the orientation-reversal responses was similar in the two groups. Direction-reversal responses across the age range, however, were smaller in the preterm infants, suggesting a delayed maturation of motion processing. Reasons for the vulnerability of motion processing are discussed; the results may reflect anomalies of white matter development in preterm infants that are undetected by ultrasonography.

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Keywords

26 infants
 
<32 weeks gestation
 
age function
 
age range
 
anomalies
 
corrected age
 
delayed maturation
 
direction-reversal visual evoked potentials
 
maturation
 
motion processing
 
motion-specific responses
 
Orientation-specific cortical responses
 
preterm infants
 
Reasons
 
ultrasonography
 
white matter development