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

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.

Time course of influence on the allocation of attentional resources caused by unconscious fearful faces

2018 ◽  
Vol 113 ◽  
pp. 104-110 ◽  
Author(s):  
Yunpeng Jiang ◽  
Xia Wu ◽  
Rami Saab ◽  
Yi Xiao ◽  
Xiaorong Gao
Keyword(s):  
Time Course ◽  
Attentional Resources ◽  
Fearful Faces

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 The electrophysiological time course of somatosensory spatial remapping: vision of the hands modulates effects of posture on somatosensory evoked potentials

2014 ◽  
Vol 39 (4) ◽  
pp. 703-703
Author(s):  
Silvia Rigato ◽  
Andrew J. Bremner ◽  
Luke Mason ◽  
Alan Pickering ◽  
Rob Davis ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Time Course

The effects of spatial frequency adaptation on human evoked potentials

1976 ◽  
Vol 16 (5) ◽  
pp. 477-479 ◽  
Author(s):  
Luciano Mecacci ◽  
Donatella Spinelli
Keyword(s):  
Spatial Frequency ◽  
Evoked Potentials ◽  
Frequency Adaptation
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