scholarly journals Discrimination of amplitude spectrum slope in the fovea and parafovea and the local amplitude distributions of natural scene imagery

10.1167/6.7.3 ◽  
2006 ◽  
Vol 6 (7) ◽  
pp. 3 ◽  
Author(s):  
Bruce C. Hansen ◽  
Robert F. Hess
Keyword(s):  
Amplitude Spectrum ◽  
Natural Scene ◽  
Spectrum Slope

scholarly journals Amplitude Spectrum Slope is More Important than Orientation in Rapid Scene Categorization

2012 ◽  
Vol 12 (9) ◽  
pp. 844-844
Author(s):  
R. V. Ringer ◽  
B. C. Hansen ◽  
K. Byrne ◽  
A. M. Larson ◽  
J. Zuercher ◽  
...  
Keyword(s):  
Amplitude Spectrum ◽  
Scene Categorization ◽  
Spectrum Slope

scholarly journals Rapid visual categorization of natural scene contexts with equalized amplitude spectrum and increasing phase noise

10.1167/9.1.2 ◽  
2009 ◽  
Vol 9 (1) ◽  
pp. 2-2 ◽  
Author(s):  
O. R. Joubert ◽  
G. A. Rousselet ◽  
M. Fabre-Thorpe ◽  
D. Fize
Keyword(s):  
Phase Noise ◽  
Amplitude Spectrum ◽  
Natural Scene ◽  
Visual Categorization

scholarly journals Eccentricity-dependent sensitivity loss of amplitude spectrum slope discrimination.

2013 ◽  
Vol 13 (9) ◽  
pp. 1237-1237
Author(s):  
A. Johnson ◽  
B. Richard ◽  
D. Ellemberg ◽  
B. Hansen
Keyword(s):  
Amplitude Spectrum ◽  
Sensitivity Loss ◽  
Spectrum Slope

Different spatial frequency bands selectively signal for natural image statistics in the early visual system

2012 ◽  
Vol 108 (8) ◽  
pp. 2160-2172 ◽  
Author(s):  
Bruce C. Hansen ◽  
Aaron P. Johnson ◽  
Dave Ellemberg
Keyword(s):  
Spatial Frequency ◽  
Broad Band ◽  
Amplitude Spectrum ◽  
Structural Complexity ◽  
Luminance Contrast ◽  
Natural Image ◽  
Natural Image Statistics ◽  
Natural Scene ◽  
Image Statistics ◽  
Neural Processes

Early visual evoked potentials (VEPs) measured in humans have recently been observed to be modulated by the image statistics of natural scene imagery. Specifically, the early VEP is dominated by a strong positivity when participants view minimally complex natural scene imagery, with the magnitude of that component being modulated by luminance contrast differences across spatial frequency (i.e., the slope of the amplitude spectrum). For scenes high in structural complexity, the early VEP is dominated by a prominent negativity that exhibits little dependency on luminance contrast. However, since natural scene imagery is broad band in terms of spatial frequency, it is not known whether the above-mentioned modulation results from a complex interaction within or between the early neural processes tuned to different bands of spatial frequency. Here, we sought to address this question by measuring early VEPs (specifically, the C1, P1, and N1 components) while human participants viewed natural scene imagery that was filtered to contain specific bands of spatial frequency information. The results show that the C1 component is largely unmodulated by the luminance statistics of natural scene imagery (being only measurable when such stimuli were made to contain high spatial frequencies). The P1 and N1, on the other hand, were observed to exhibit strong spatial frequency-dependent modulation to the luminance statistics of natural scene imagery. The results therefore suggest that the dependency of early VEPs on natural image statistics results from an interaction between the early neural processes tuned to different bands of spatial frequency.

scholarly journals Symmetry Modulates the Amplitude Spectrum Slope Effect on Visual Preference

Symmetry ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 1820
Author(s):  
Chia-Ching Wu ◽  
Chien-Chung Chen
Keyword(s):  
Modulation Depth ◽  
Amplitude Spectrum ◽  
Quadratic Function ◽  
Natural Image ◽  
Human Observer ◽  
Aesthetic Value ◽  
Preference Rating ◽  
Two Factors ◽  
Amplitude Decrease ◽  
Spectrum Slope

Within the spectrum of a natural image, the amplitude of modulation decreases with spatial frequency. The speed of such an amplitude decrease, or the amplitude spectrum slope, of an image affects the perceived aesthetic value. Additionally, a human observer would consider a symmetric image more appealing than they would an asymmetric one. We investigated how these two factors jointly affect aesthetic preferences by manipulating both the amplitude spectrum slope and the symmetric level of images to assess their effects on aesthetic preference on a 6-point Likert scale. Our results showed that the preference ratings increased with the symmetry level but had an inverted U-shaped relation to amplitude spectrum slope. In addition, a strong interaction existed between symmetry level and amplitude spectrum slope on preference rating, in that symmetry can amplify the amplitude spectrum slope’s effects. A quadratic function of the spectrum slope can describe such effects. That is, preference is an inverted U-shaped function of spectrum slope whose intercept is determined by the number of symmetry axes. The modulation depth of the quadratic function manifests the interaction between the two factors.

scholarly journals Center-surround effects in human discrimination of amplitude spectrum slope

2010 ◽  
Vol 7 (9) ◽  
pp. 967-967
Author(s):  
A. Johnson ◽  
B. Hansen ◽  
D. Ellemberg
Keyword(s):  
Amplitude Spectrum ◽  
Spectrum Slope

scholarly journals Aesthetic Judgement of Orientation in Modern Art

i-Perception ◽  
2012 ◽  
Vol 3 (1) ◽  
pp. 18-24 ◽  
Author(s):  
George Mather
Keyword(s):  
Modern Art ◽  
Amplitude Spectrum ◽  
Fourier Amplitude ◽  
Physical Measure ◽  
Aesthetic Judgement ◽  
Correct Orientation ◽  
Perfect Performance ◽  
Fourier Amplitude Spectrum ◽  
The Impact ◽  
Spectrum Slope

When creating an artwork, the artist makes a decision regarding the orientation at which the work is to be hung based on their aesthetic judgement and the message conveyed by the piece. Is the impact or aesthetic appeal of a work diminished when it is hung at an incorrect orientation? To investigate this question, Experiment 1 asked whether naïve observers can appreciate the correct orientation (as defined by the artist) of 40 modern artworks, some of which are entirely abstract. Eighteen participants were shown 40 paintings in a series of trials. Each trial presented all four cardinal orientations on a computer screen, and the participant was asked to select the orientation that was most attractive or meaningful. Results showed that the correct orientation was selected in 48% of trials on average, significantly above the 25% chance level, but well below perfect performance. A second experiment investigated the extent to which the 40 paintings contained recognisable content, which may have mediated orientation judgements. Recognition rates varied from 0% for seven of the paintings to 100% for five paintings. Orientation judgements in Experiment 1 correlated significantly with “meaningful” content judgements in Experiment 2: 42% of the variance in orientation judgements in Experiment 1 was shared with recognition of meaningful content in Experiment 2. For the seven paintings in which no meaningful content at all was detected, 41% of the variance in orientation judgements was shared with variance in a physical measure of image content, Fourier amplitude spectrum slope. For some paintings, orientation judgements were quite consistent, despite a lack of meaningful content. The origin of these orientation judgements remains to be identified.

scholarly journals Discrimination of amplitude spectrum slope of natural scenes during childhood

2010 ◽  
Vol 7 (9) ◽  
pp. 962-962
Author(s):  
D. Ellemberg ◽  
B. Hansen ◽  
A. Johnson
Keyword(s):  
Amplitude Spectrum ◽  
Natural Scenes ◽  
Spectrum Slope

scholarly journals Adaptation to the Amplitude Spectrum Slope of Natural Scenes in Modified Reality

2019 ◽  
Vol 19 (10) ◽  
pp. 188c
Author(s):  
Bruno Richard ◽  
Patrick Shafto
Keyword(s):  
Amplitude Spectrum ◽  
Natural Scenes ◽  
Spectrum Slope
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