Results 21 to 30 of about 530,690 (264)

Spatial frequency discrimination in schizophrenia. [PDF]

Journal of Abnormal Psychology, 2002
Pathways within the visual system can be distinguished on the basis of selectivity for low or high spatial frequencies. Spatial frequency discrimination was evaluated in 17 medicated male patients with schizophrenia and 19 male control subjects. Subjects were required to discriminate whether pairs of high contrast, sinusoidally modulated gratings were ...
Brian F. O'Donnell, Geoffrey F. Potts, Paul G. Nestor, Kiriaki C Stylianopoulos, Martha E. Shenton, Robert W. McCarley   +5 more
openaire   +6 more sources

Literacy acquisition facilitates inversion effects for faces with full-, low-, and high-spatial frequency: evidence from illiterate and literate adults

Frontiers in Psychology, 2023
Previous studies have found that literacy acquisition modulates configural face processing (i.e., holistic and second-order configural processing). However, it remains unclear how literacy acquisition impacts the configural processing indexed by the ...
Qi Yang, Qi Yang, Lina Zhang, Changming Chen, Xiaohua Cao, Xiaohua Cao, Xiaohua Cao   +6 more
doaj   +1 more source

Numerical Method for Analysis of Waveguide Modes in Planar Gradient Waveguides

Medžiagotyra, 2014
This paper presents a numerical method developed to find propagation constants of planar waveguide localized modes. The method is based on both the Fourier transform application and the wave equation solution in a frequency domain.
Volodymyr Mykhailovych FITIO, Volodymyr Volodymyrovych ROMAKH, Yaroslav Vasylovych BOBITSKI   +2 more
doaj   +1 more source

Resolution Enhancement in Extreme Ultraviolet Ptychography Using a Refined Illumination Probe and Small-Etendue Source

Photonics
Extreme ultraviolet (EUV) ptychography is a promising actinic mask metrology technique capable of providing aberration-free images with subwavelength resolution.
Seungchan Moon, Junho Hong, Taeho Lee, Jinho Ahn   +3 more
doaj   +1 more source

Lower Internal Additive Noise and Better Perceptual Template Characterize Binocular Contrast Sensitivity Summation

Frontiers in Psychology, 2021
Binocular summation is generally defined as the superiority of binocular over monocular performance. Here, we investigated how external noise modulates the effect of binocular summation on the contrast sensitivity function (CSF) and clarified the ...
Pan Zhang, Hanlin Wang, Weicong Ren, Qing Lu, Chenxi Li, Ge Chen, Shilei Zhang, Jiayu Tao, Ying Li, Di Wu, Zeng Wang   +10 more
doaj   +1 more source

The Impact of Spatial Frequency on the Perception of Crowd Emotion: An fMRI Study

Brain Sciences, 2023
Recognizing the emotions of faces in a crowd is crucial for understanding overall behavior and intention as well as for smooth and friendly social interactions.
Dongfang Zhao, Xiangnan Shen, Shuaixia Li, Weiqi He   +3 more
doaj   +1 more source

Attention to local and global levels of hierarchical Navon figures affects rapid scene categorization

Frontiers in Psychology, 2014
In four experiments, we investigated how attention to local and global levels of hierarchical Navon figures affected the selection of diagnostic spatial scale information used in scene categorization.
John eBrand, Aaron Paul Johnson, Aaron Paul Johnson   +2 more
doaj   +1 more source

Impaired Adaptation and Laminar Processing of the Oddball Paradigm in the Primary Visual Cortex of Fmr1 KO Mouse

Frontiers in Cellular Neuroscience, 2021
Both adaptation and novelty detection are an integral part of sensory processing. Recent animal oddball studies have advanced our understanding of circuitry underlying contextual processing in early sensory areas.
Alexandr Pak, Samuel T. Kissinger, Alexander A. Chubykin   +2 more
doaj   +1 more source

The development of spatial frequency discrimination

Journal of Vision, 2010
We compared thresholds for discriminating spatial frequency for children aged 5, 7, and 9 years, and adults at two baseline spatial frequencies (1 and 3 cpd). In Experiment 1, the minimum change from baseline necessary to detect a change in spatial frequency from either baseline decreased with age from 34% in 5-year-olds to 11% in 7-year-olds, 8% in 9 ...
Ashna, Patel, Daphne, Maurer, Terri L, Lewis   +2 more
openaire   +2 more sources

Adaptation to a ‘Spatial-Frequency Doubled’ Stimulus [PDF]

Perception, 1980
The perceived spatial frequency of low-frequency sinusoidal gratings is elevated when the gratings are temporally modulated sufficiently rapidly. Although this phenomenon is usually called ‘spatial-frequency doubling’, the magnitude of this spatial-frequency elevation depends on the spatial and temporal parameters of the grating and may be less than ...
Thompson, Peter Gage, Murphy, Brian
openaire   +3 more sources