PT  - JOURNAL ARTICLE
AU  - Cesar Echavarria
AU  - Shahin Nasr
AU  - Roger Tootell
TI  - Smooth versus Textured Surfaces: Feature-Based Category Selectivity in Human Visual Cortex
AID  - 10.1523/ENEURO.0051-16.2016
DP  - 2016 Sep 01
TA  - eneuro
PG  - ENEURO.0051-16.2016
VI  - 3
IP  - 5
4099  - http://www.eneuro.org/content/3/5/ENEURO.0051-16.2016.short
4100  - http://www.eneuro.org/content/3/5/ENEURO.0051-16.2016.full
SO  - eNeuro2016 Sep 01; 3
AB  - In fMRI studies, human lateral occipital (LO) cortex is thought to respond selectively to images of objects, compared with nonobjects. However, it remains unresolved whether all objects evoke equivalent levels of activity in LO, and, if not, which image features produce stronger activation. Here, we used an unbiased parametric texture model to predict preferred versus nonpreferred stimuli in LO. Observation and psychophysical results showed that predicted preferred stimuli (both objects and nonobjects) had smooth (rather than textured) surfaces. These predictions were confirmed using fMRI, for objects and nonobjects. Similar preferences were also found in the fusiform face area (FFA). Consistent with this: (1) FFA and LO responded more strongly to nonfreckled (smooth) faces, compared with otherwise identical freckled (textured) faces; and (2) strong functional connections were found between LO and FFA. Thus, LO and FFA may be part of an information-processing stream distinguished by feature-based category selectivity (smooth > textured).