scholarly journals Measuring the time course of spatial frequency use for face recognition from East to West

2016 ◽  
Vol 16 (12) ◽  
pp. 1393
Author(s):  
Amanda Estephan ◽  
Camille Saumure Regimbald ◽  
Daniel Fiset ◽  
Dan Sun ◽  
Ye Zhang ◽  
...  
Keyword(s):  
Face Recognition ◽  
Spatial Frequency ◽  
Time Course

Receptive Field Size and Response Latency Are Correlated Within the Cat Visual Thalamus

2005 ◽  
Vol 93 (6) ◽  
pp. 3537-3547 ◽  
Author(s):  
Chong Weng ◽  
Chun-I Yeh ◽  
Carl R. Stoelzel ◽  
Jose-Manuel Alonso
Keyword(s):  
Receptive Field ◽  
Spatial Frequency ◽  
Response Latency ◽  
Time Course ◽  
Frequency Tuning ◽  
Receptive Fields ◽  
Cortical Cell ◽  
Field Size ◽  
Receptive Field Size ◽  
Spatial Frequency Tuning

Each point in visual space is encoded at the level of the thalamus by a group of neighboring cells with overlapping receptive fields. Here we show that the receptive fields of these cells differ in size and response latency but not at random. We have found that in the cat lateral geniculate nucleus (LGN) the receptive field size and response latency of neighboring neurons are significantly correlated: the larger the receptive field, the faster the response to visual stimuli. This correlation is widespread in LGN. It is found in groups of cells belonging to the same type (e.g., Y cells), and of different types (i.e., X and Y), within a specific layer or across different layers. These results indicate that the inputs from the multiple geniculate afferents that converge onto a cortical cell (approximately 30) are likely to arrive in a sequence determined by the receptive field size of the geniculate afferents. Recent studies have shown that the peak of the spatial frequency tuning of a cortical cell shifts toward higher frequencies as the response progresses in time. Our results are consistent with the idea that these shifts in spatial frequency tuning arise from differences in the response time course of the thalamic inputs.

scholarly journals Link between initial fixation location and spatial frequency utilization in face recognition

2019 ◽  
Vol 19 (10) ◽  
pp. 216a
Author(s):  
Amanda Estéphan ◽  
Carine Charbonneau ◽  
Virginie Leblanc ◽  
Daniel Fiset ◽  
Caroline Blais
Keyword(s):  
Face Recognition ◽  
Spatial Frequency ◽  
Fixation Location ◽  
Initial Fixation

Exposure-Time and Spatial-Frequency Effects in the Tilt Illusion

Perception ◽  
1979 ◽  
Vol 8 (5) ◽  
pp. 557-564 ◽  
Author(s):  
Brian I O'Toole
Keyword(s):  
Spatial Frequency ◽  
Indirect Effects ◽  
Time Course ◽  
Test Line ◽  
Acute Angle ◽  
Direct Effects ◽  
Time Constants ◽  
Frequency Effects ◽  
Tilt Illusion ◽  
Vertical Test

The exposure durations of a vertical test line and a tilted inducing grating were varied and the tilt illusion thus generated was found to change as a function of this variation. Significant direct effects (acute-angle expansion) and indirect effects (acute-angle contraction) were found to occur at times consistent with Andrews's estimate of the time course of inhibition in the visual system when the inducing grating had a spatial frequency of 10 cycles deg−1. However, a 2 · 71 cycles deg−1 grating gave significant effects at exposure durations of 10 as well as 1000 ms, while in a further experiment a 10 · 91 cycles deg−1 grating gave significant effects at 1000 ms only. These results seem to suggest that orientation interactions thought to be due to inhibition (direct effect) and disinhibition (indirect effect) may occur within both sustained and transient channels with concomitant differences in time constants.

scholarly journals Face Recognition Is Affected by Similarity in Spatial Frequency Range to a Greater Degree Than Within-Category Object Recognition.

2004 ◽  
Vol 30 (5) ◽  
pp. 975-987 ◽  
Author(s):  
Charles A. Collin ◽  
Chang Hong Liu ◽  
Nikolaus F. Troje ◽  
Patricia A. McMullen ◽  
Avi Chaudhuri
Keyword(s):  
Face Recognition ◽  
Object Recognition ◽  
Spatial Frequency ◽  
Frequency Range

scholarly journals Enhanced extrastriate visual response to bandpass spatial frequency filtered fearful faces: Time course and topographic evoked-potentials mapping

2005 ◽  
Vol 26 (1) ◽  
pp. 65-79 ◽  
Author(s):  
Gilles Pourtois ◽  
Elise S. Dan ◽  
Didier Grandjean ◽  
David Sander ◽  
Patrik Vuilleumier
Keyword(s):  
Spatial Frequency ◽  
Evoked Potentials ◽  
Time Course ◽  
Visual Response ◽  
Fearful Faces

scholarly journals Brief Report: Developing Spatial Frequency Biases for Face Recognition in Autism and Williams Syndrome

2010 ◽  
Vol 41 (7) ◽  
pp. 968-973 ◽  
Author(s):  
Hayley C. Leonard ◽  
Dagmara Annaz ◽  
Annette Karmiloff-Smith ◽  
Mark H. Johnson
Keyword(s):  
Face Recognition ◽  
Spatial Frequency ◽  
Williams Syndrome

scholarly journals Effects of image background on spatial frequency thresholds for face recognition

2005 ◽  
Vol 5 (8) ◽  
pp. 829-829
Author(s):  
C. A. Collin ◽  
B. O'Byrne ◽  
L. Wang
Keyword(s):  
Face Recognition ◽  
Spatial Frequency

Dynamic Contrast Perception Assessed by Pattern Masking

Perception ◽  
1996 ◽  
Vol 25 (1_suppl) ◽  
pp. 19-19
Author(s):  
R W Bowen ◽  
H de Ridder
Keyword(s):  
Spatial Frequency ◽  
Contrast Enhancement ◽  
Time Course ◽  
Negative Contrast ◽  
Positive Contrast ◽  
Opposite Polarity ◽  
Enhancement Effect ◽  
Mask Duration ◽  
Pattern Masking ◽  
Contrast Perception

The perceived contrast of a pulsed grating of about 100 ms duration can exceed that of shorter or longer exposures. We investigated this contrast enhancement effect with pattern masking. The pulsed mask patterns were extended cosines (5 deg square, 35 cd m−2 mean luminance, 0.3 contrast) of 50 to 500 ms duration. Mask spatial frequency was 1 or 6 cycles deg−1. The test patterns (of equivalent spatial frequency) were sixth derivative Gaussians, either positive (ON pathway mediation) or negative (OFF pathway mediation) and of 30 ms duration. The test pattern could be centred on a light bar of the cosine (positive contrast) or a dark bar (negative contrast). Test and mask had simultaneous onset. For a 1 cycle deg−1 test and mask of the same polarity, the test threshold/mask duration function is nonmonotonic (peak at 83 – 100 ms). The function was similar for either positive or negative stimuli. Thus, we measured an analogue to the contrast enhancement effect, and found enhancement for negative as well as positive contrast components. For same-polarity 6 cycles deg−1 test and mask, threshold increased monotonically to 500 ms (no enhancement). For both 1 and 6 cycles deg−1 stimuli of opposite polarity, the threshold/mask duration function is sharply elevated and constant for masks of 83 ms or more. The same-polarity masking functions imply activation of either transient (1 cycle deg−1 stimuli) or sustained (6 cycles deg−1 stimuli) ON or OFF pathways. The opposite-polarity functions suggest that the time course of ON — OFF pathway interaction is similar for sustained and transient pathways.

scholarly journals Typical and atypical development of a mid-band spatial frequency bias in face recognition

2010 ◽  
Vol 10 (7) ◽  
pp. 586-586
Author(s):  
H. C. Leonard ◽  
D. Annaz ◽  
A. Karmiloff-Smith ◽  
M. H. Johnson
Keyword(s):  
Face Recognition ◽  
Spatial Frequency ◽  
Atypical Development
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