Distinct and Convergent Visual Processing of High and Low Spatial Frequency Information in Faces

Rotshtein P, Vuilleumier P, Winston J, Driver J, Dolan R.
Cereb Cortex. 2007 Feb 5

We tested for differential brain response to distinct spatial frequency (SF) components in faces. During a functional magnetic resonance imaging experiment, participants were presented with "hybrid" faces containing superimposed low and high SF information from different identities. We used a repetition paradigm where faces at either SF range were independently repeated or changed across consecutive trials. In addition, we manipulated which SF band was attended. Our results suggest that repetition and attention affected partly overlapping occipitotemporal regions but did not interact. Changes of high SF faces increased responses of the right inferior occipital gyrus (IOG) and left inferior temporal gyrus (ITG), with the latter response being also modulated additively by attention. In contrast, the bilateral middle occipital gyrus (MOG) responded to repetition and attention manipulations of low SF. A common effect of high and low SF repetition was observed in the right fusiform gyrus (FFG). Follow-up connectivity analyses suggested direct influence of the MOG (low SF), IOG, and ITG (high SF) on the FFG responses. Our results reveal that different regions within occipitotemporal cortex extract distinct visual cues at different SF ranges in faces and that the outputs from these separate processes project forward to the right FFG, where the different visual cues may converge.

PMID: 17283203

Free Fulltext: http://cercor.oxfordjournals.org/cgi/reprint/bhl180v1

The Perception of Emotion and Social Cues in Faces

Hi, Folks!
Thanks for inviting me in your weblog, specially my dear Ali ... And I'm sorry for the the terrible mess I'm going to make of your weblog in advance. My condolences!

OK, I don't know what can be said and what not in this weblog, so I save my jokes and introduce you scientific craps:
Recently, say January 2007, an almost decent, very-well-IF-scored journal called "Neuropsychologia" published a special issue on face perception. You can find some famous names like James Haxby, Edmund T. Rolls among editors and authors.
Ed Rolls has a review article in this issue which is from cover to cover about his works and papers as you may guess. But it is a Pretty good one:

Edmund T. Rolls
The representation of information about faces in the temporal and frontal lobes.
Neuropsychologia Volume 45, Issue 1 , 2007, Pages 124-143 The Perception of Emotion and Social Cues in Faces

You may find another interesting paper as fun stuff in this issue by David I. Perrett. At least you can evaluate you GF with it if know enough about advance math the paper used.

Brain systems for assessing facial attractiveness.
Neuropsychologia Volume 45, Issue 1 , 2007, Pages 195-206

OK, That's all.
CU

The fusiform face area: a cortical region specialized for the perception of faces

Nancy Kanwisher1, Galit Yovel
A comprehensive review of face recognition literature, with focus on human data.
Phil. Trans. R. Soc. B (2006) 361, 2109–2128
doi:10.1098