Poster E104, Monday, March 27, 2:30 – 4:30 pm, Pacific Concourse
Face and place selectivity develop in tandem with the visual field representations along the VTC in children
Golijeh Golarai1, Alina Liberman1, Kalanit Grill-Spector1; 1Stanford University
In adults face-selective regions across the ventral temporal cortex (VTC) overlap with representations of central visual field, and place-selective regions with peripheral representations, perhaps due to the habitual patterns of viewing faces with central and places with peripheral vision. We previously reported the slow and differential development of category selective regions, whereby parahippocampal place selective regions (PPA) become adult-like by the teens, but face-selective regions in the fusiform gyrus (FFA) develop more slowely into adulthood. However, the developmental time course of center-periphery representations in VTC and their spatial relation to the developing category selective regions are unknown. Thus, we examined the development of center-periphery organization in the FFA and PPA in children (ages 8 - 10 , n = 12 ), adolescents (ages 12 -16, n = 13 ) and adults (ages 18 - 40, n= 12). During fMRI, subjects fixated on a central point while viewing faces and places, presented either centrally spanning 3°, or peripherally within a 12°-24° ring. Using a localizer experiment we also identified the FFA and PPA in each subject. After validating fixation performance, we found an age related increase during childhood in the peripheral bias of the left PPA and foveal bias of the FFA bilaterally, that reached adult levels during the teens. Thus, development of category selectivity and eccentricity bias overlap temporally and spatially during childhood, but face selectivity continues to develop during the teens, even after local foveal bias becomes adult like.
Topic Area: PERCEPTION & ACTION: Development & aging