منابع مشابه
The Constancy of Colored After-Images
We undertook psychophysical experiments to determine whether the color of the after-image produced by viewing a colored patch which is part of a complex multi-colored scene depends on the wavelength-energy composition of the light reflected from that patch. Our results show that it does not. The after-image, just like the color itself, depends on the ratio of light of different wavebands reflec...
متن کاملQuantitative study of visual after-images.
MUCH has been written on the persistence of visual sensation after the light stimulus has been removed-the so-called visual after-image (Helmholtz, 1924; Duke-Elder, 1932). The after-image may be positive, in which the light and dark parts correspond to those of the object, or negative, in which the light and dark parts are reversed. Similarly, in the positive after-image of a coloured object, ...
متن کاملTactile After-images from Static Contact
It is well known that human skin is a viscoelastic material , and the mechanical and electrophysiological responses to transient indentation have been studied and modelled. For tac-tile display system design, it is also important to determine the perceptual eeects, if any, of skin viscoelasticity. The spatial characteristics and sinusoidal steady state response of the sense of touch have been c...
متن کاملQuantification of Partial Volume Effects in Salivary Glands SPECT Images after Radiation Therapy of Head and Neck Tumors
Introduction: Radical radiation therapy of head and neck cancers may injure the salivary glands and reduce their function. Single-photon emission computed tomography (SPECT) images maybe used to evaluate function post-therapy. However, accurate quantification is hindered by the partial volume effects (PVEs). The present study involved the introduction of a PVEs quantif...
متن کاملFluid-attenuated inversion recovery images and stroke outcome after thrombolysis.
BACKGROUND AND PURPOSE We investigated if hyperintensities on fluid-attenuated inversion recovery (FLAIR) sequences in arteries and parenchyma are associated with poor outcome 3 months after thrombolysis. METHODS Consecutive acute stroke patients with known time of symptom onset who had an MRI before and 1 day after thrombolysis were included in this study. Blinded to follow-up imaging and ou...
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ژورنال
عنوان ژورنال: The Psychological Review: Monograph Supplements
سال: 1899
ISSN: 0096-9753
DOI: 10.1037/h0092991