Abstract:
:The present experiment uses a quadrature motion paradigm to investigate the motion correspondence cues used by young infants for coding the direction of motion of red/green isoluminant gratings. Three-month-old infants and adults were tested with 0.25 c/d luminance-modulated or red/green isoluminant gratings, either moving continuously or shifted in spatial quadrature. Both direction-of-motion and detection thresholds were measured, and motion:detection (M:D) threshold ratios were examined. Infants, like adults, could code the direction of motion of red/green quadrature-shifted gratings. In adults, M:D ratios were similar for continuous and quadrature motion. In infants, M:D ratios were higher for quadrature than for continuous motion, but elevations of similar magnitude were seen for both luminance-modulated and red/green gratings. The results suggest that frequency-doubled signals, such as those often seen in the magnocellular (M-cell) pathway, are not necessary for coding the direction of motion of isoluminant gratings in infant subjects. Two other theoretical options--mediation by the scatter of isoluminance points in the M-cell population, and parvocellular (P-cell) mediation--are discussed.
journal_name
Vision Resjournal_title
Vision researchauthors
Lia B,Dobkins KR,Palmer J,Teller DYdoi
10.1016/s0042-6989(98)00202-8subject
Has Abstractpub_date
1999-05-01 00:00:00pages
1783-94issue
10eissn
0042-6989issn
1878-5646pii
S0042-6989(98)00202-8journal_volume
39pub_type
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