[Abstract Title]. - Society for Neuroscience

the temporal visual cortex of monkeys are tuned to image-based spatial frequencies or retinabased
spatial frequencies by changing the retinal size of the face images. We used a face image
set that combined the center image-based spatial frequencies (2, 2.8, 4, 5.7, 8, 11.3, 16
cycles/image) of 7 band-pass filters and 5 image sizes (3.8, 5.4, 7.7, 11, 15.3 degrees). We
recorded 60 face responsive neurons in the inferior temporal gyrus and the upper and lower
banks of the superior temporal sulcus (A18 - A24) from an awake, fixating monkey (Macaca
fuscata). Among them, 43 neurons were selective for center image-based spatial frequencies in at
least one image size. We examined the effects of image size on image-based spatial frequency
tuning by assessing the shift in preferred image-based spatial frequencies. Some neurons showed
a preferred image-based spatial frequency across different image sizes. Others showed a shift in
the preferred image-based spatial frequencies depending on image size. Overall, despite a wide
variety of shifts in the tuning curves, image-based spatial frequency tuning as a whole depended
only weakly on image size. Furthermore, the neurons were tuned to image-based spatial
frequency rather than retina-based spatial frequency. The results suggest that the neural
representation of the face in the temporal visual cortex is made by integrating various ranges of
retina-based spatial frequencies and is minimally dependent on the retinal size of the face image.
Disclosures: M. Inagaki , None; I. Fujita, None.
Poster
261. Object and Faces: Neuronal Representation I
Time: Sunday, November 16, 2008, 1:00 pm - 5:00 pm
Program#/Poster#: 261.13/CC10
Topic: D.04.j. Processing of objects and faces
Support: DARPA
Lions Foundation
NDSEG Fellowship
Title: Neural representations of cluttered scenes in macaque ventral visual cortex
Authors: *E. M. MEYERS 1 , H. EMBARK 2 , T. SERRE 1 , G. KREIMAN 3 , W. A. FREIWALD 2 ,
T. POGGIO 1 ;
1 Brain & Cognitive Sci., MIT, Cambridge, MA; 2 Ctr. for Cognitive Science, Brain Res. Inst.,
Univ. of Bremen, Bremen, Germany; 3 Ophthalmology and Program in Neurosci., Children's
Hosp. Boston, Harvard Med. Sch., Boston, MA