scholarly journals Neural processing of high and low spatial frequency information in faces changes across development: qualitative changes in face processing during adolescence

2013 ◽  
Vol 37 (9) ◽  
pp. 1448-1457 ◽  
Author(s):  
Judith C. Peters ◽  
Petra Vlamings ◽  
Chantal Kemner
Keyword(s):  
Spatial Frequency ◽  
Face Processing ◽  
Neural Processing ◽  
Frequency Information ◽  
Qualitative Changes

Faster, stronger, lateralized: Low spatial frequency information supports face processing

2011 ◽  
Vol 49 (13) ◽  
pp. 3583-3590 ◽  
Author(s):  
Bhuvanesh Awasthi ◽  
Jason Friedman ◽  
Mark A. Williams
Keyword(s):  
Spatial Frequency ◽  
Face Processing ◽  
Frequency Information

Increased fusiform area activation in schizophrenia during processing of spatial frequency-degraded faces, as revealed by fMRI

2009 ◽  
Vol 40 (7) ◽  
pp. 1159-1169 ◽  
Author(s):  
S. M. Silverstein ◽  
S. D. All ◽  
R. Kasi ◽  
S. Berten ◽  
B. Essex ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
Perceptual Organization ◽  
Face Processing ◽  
Gender Discrimination ◽  
High Spatial Frequency ◽  
Superior Performance ◽  
Full Spectrum ◽  
Frequency Information ◽  
Form Processing ◽  
Patient Performance

BackgroundPeople with schizophrenia demonstrate perceptual organization impairments, and these are thought to contribute to their face processing difficulties.MethodWe examined the neural substrates of emotionally neutral face processing in schizophrenia by investigating neural activity under three stimulus conditions: faces characterized by the full spectrum of spatial frequencies, faces with low spatial frequency information removed [high spatial frequency (HSF) condition], and faces with high spatial frequency information removed [low spatial frequency (LSF) condition]. Face perception in the HSF condition is more reliant on local feature processing whereas perception in the LSF condition requires greater reliance on global form processing. Past studies of perceptual organization in schizophrenia indicate that patients perform relatively more poorly with degraded stimuli but also that, when global information is absent, patients may perform better than controls because of their relatively increased ability to initially process individual features. Therefore, we hypothesized that people with schizophrenia (n=14) would demonstrate greater face processing difficulties than controls (n=13) in the LSF condition, whereas they would demonstrate a smaller difference or superior performance in the HSF condition.ResultsIn a gender-discrimination task, behavioral data indicated high levels of accuracy for both groups, with a trend toward an interaction involving higher patient performance in the HSF condition and poorer patient performance in the LSF condition. Patients demonstrated greater activity in the fusiform gyrus compared to controls in both degraded conditions.ConclusionsThese data suggest that impairments in basic integration abilities may be compensated for by relatively increased activity in this region.

scholarly journals Long-term adaptation to ocular aberrations alters visual processing of spatial frequency information

2016 ◽  
Vol 16 (12) ◽  
pp. 554
Author(s):  
Antoine Barbot ◽  
Krystel Huxlin ◽  
Duje Tadin ◽  
Geunyoung Yoon
Keyword(s):  
Spatial Frequency ◽  
Visual Processing ◽  
Frequency Information ◽  
Ocular Aberrations

No Sex Differences in Contrast Sensitivity and Reaction Time to Spatial Frequency

2002 ◽  
Vol 94 (3) ◽  
pp. 1053-1055 ◽  
Author(s):  
Jennifer L. Solberg ◽  
James M. Brown
Keyword(s):  
Sex Differences ◽  
Reaction Time ◽  
Spatial Frequency ◽  
Contrast Sensitivity ◽  
Frequency Information ◽  
Frequency Processing

This study investigated the possibility of sex differences in spatial frequency processing by measuring contrast sensitivity and reaction time to spatial frequency in the same 20 men and 20 women. This is the first study to investigate sex differences in reaction time to spatial frequency and the first to study sex differences in contrast sensitivity and reaction time within the same participants. No sex differences were found in either contrast sensitivity or reaction time measures, suggesting that women and men process spatial frequency information similarly.

scholarly journals Rapid Temporal Recalibration to Audiovisual Asynchrony Occurs Across the Difference in Neural Processing Speed Based on Spatial Frequency

i-Perception ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 204166952096661
Author(s):  
Yasuhiro Takeshima
Keyword(s):  
Spatial Frequency ◽  
Processing Speed ◽  
Audiovisual Integration ◽  
Auditory Stimuli ◽  
Neural Processing ◽  
Temporal Recalibration ◽  
Synchrony Perception ◽  
The Difference ◽  
The One ◽  
The Brain

Audiovisual integration relies on temporal synchrony between visual and auditory stimuli. The brain rapidly adapts to audiovisual asynchronous events by shifting the timing of subjective synchrony in the direction of the leading modality of the most recent event, a process called rapid temporal recalibration. This phenomenon is the flexible function of audiovisual synchrony perception. Previous studies found that neural processing speed based on spatial frequency (SF) affects the timing of subjective synchrony. This study examined the effects of SF on the rapid temporal recalibration process by discriminating whether the presentation of the visual and auditory stimuli was simultaneous. I compared the magnitudes of the recalibration effect between low and high SF visual stimuli using two techniques. First, I randomly presented each SF accompanied by a tone during one session, then in a second experiment, only a single SF was paired with the tone throughout the one session. The results indicated that rapid recalibration occurred regardless of difference in presented SF between preceding and test trials. The recalibration magnitude did not significantly differ between the SF conditions. These findings confirm that intersensory temporal process is important to produce rapid recalibration and suggest that rapid recalibration can be induced by the simultaneity judgment criterion changes attributed to the low-level temporal information of audiovisual events.

scholarly journals Contrast sensitivity and behavioural evidence for lateral inhibition in octopus

2019 ◽  
Vol 15 (5) ◽  
pp. 20190134 ◽  
Author(s):  
Luis Nahmad-Rohen ◽  
Misha Vorobyev
Keyword(s):  
Spatial Frequency ◽  
Contrast Sensitivity ◽  
Lateral Inhibition ◽  
Neural Processing ◽  
Visual Systems ◽  
Maximum Value ◽  
Fixation Reflex ◽  
First Time ◽  
The Brain ◽  
Behavioural Evidence

Behavioural contrast sensitivity in Octopus tetricus was measured in the range of 0.05–12 cycles per degree (cpd) using a fixation reflex. We show that the contrast sensitivity reaches its maximum (between 1 and 4%) at 0.3 cpd, and decreases to approximately half of the maximum value at the lowest spatial frequency. Reduction of sensitivity at low spatial frequency is a signature of lateral inhibition in visual systems. In vertebrates and insects, lateral inhibition helps to overcome the bottleneck of encoding information into spikes. In octopus, photoreceptors generate spikes themselves and are directly connected to the brain through their axons. Therefore, the neural processing occurring in the octopus brain cannot help overcome the bottleneck of encoding information into spikes. We conclude that, in octopus, either the lateral inhibition occurs in the brain after information has been encoded into spikes, or photoreceptors inhibit each other. This is the first time behavioural contrast sensitivity has been measured in a cephalopod.

The importance of low spatial frequency information for recognising fearful facial expressions

2009 ◽  
Vol 21 (1) ◽  
pp. 75-83 ◽  
Author(s):  
Martial Mermillod ◽  
Patrik Vuilleumier ◽  
Carole Peyrin ◽  
David Alleysson ◽  
Christian Marendaz
Keyword(s):  
Spatial Frequency ◽  
Facial Expressions ◽  
Frequency Information
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