Visual adaptation and the amplitude spectra of radiological images
| Autor: | John M. Boone, Craig K. Abbey, Elysse Kompaniez-Dunigan, Michael A. Webster |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
genetic structures
Cognitive Neuroscience media_common.quotation_subject Spatial vision Phase (waves) lcsh:Consciousness. Cognition Experimental and Cognitive Psychology Adaptation (eye) 050105 experimental psychology 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Clinical Research Psychology Contrast (vision) 0501 psychology and cognitive sciences Sensitivity (control systems) Adaptation Eye Disease and Disorders of Vision media_common Visual search Physics business.industry Blur perception 05 social sciences Spatial contrast sensitivity Pattern recognition lcsh:BF309-499 Medical images Amplitude Natural image statistics Cognitive Sciences Original Article Spatial frequency Artificial intelligence Focus (optics) business |
| Zdroj: | Cognitive Research Cognitive Research, Vol 3, Iss 1, Pp 1-12 (2018) Cognitive research: principles and implications, vol 3, iss 1 |
| ISSN: | 2365-7464 |
| DOI: | 10.1186/s41235-018-0089-4 |
| Popis: | We examined how visual sensitivity and perception are affected by adaptation to the characteristic amplitude spectra of X-ray mammography images. Because of the transmissive nature of X-ray photons, these images have relatively more low-frequency variability than natural images, a difference that is captured by a steeper slope of the amplitude spectrum (~ − 1.5) compared to the ~ 1/f (slope of − 1) spectra common to natural scenes. Radiologists inspecting these images are therefore exposed to a different balance of spectral components, and we measured how this exposure might alter spatial vision. Observers (who were not radiologists) were adapted to images of normal mammograms or the same images sharpened by filtering the amplitude spectra to shallower slopes. Prior adaptation to the original mammograms significantly biased judgments of image focus relative to the sharpened images, demonstrating that the images are sufficient to induce substantial after-effects. The adaptation also induced strong losses in threshold contrast sensitivity that were selective for lower spatial frequencies, though these losses were very similar to the threshold changes induced by the sharpened images. Visual search for targets (Gaussian blobs) added to the images was also not differentially affected by adaptation to the original or sharper images. These results complement our previous studies examining how observers adapt to the textural properties or phase spectra of mammograms. Like the phase spectrum, adaptation to the amplitude spectrum of mammograms alters spatial sensitivity and visual judgments about the images. However, unlike the phase spectrum, adaptation to the amplitude spectra did not confer a selective performance advantage relative to more natural spectra. Electronic supplementary material The online version of this article (10.1186/s41235-018-0089-4) contains supplementary material, which is available to authorized users. |
| Databáze: | OpenAIRE |
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