http://precedings.nature.com/tags/psychophysics Recently posted documents tagged with 'psychophysics' Nature Publishing Group en Nature Precedings http://precedings.nature.com/images/header_logo.gif http://precedings.nature.com http://dx.doi.org/10.1038/npre.2008.1584.1 A number of investigators have found perceptual deficits in schizophrenic subjects. It has also been indicated that those with schizophrenia suffer from reduced attention. This raises the possibility that their perceptual deficits may wholly or in part reflect attentional effects. The present study used computer simulations to examine the potential effects of inattention on performance measures determined with three psychophysical methods: the Two Alternative Forced Choice (2-AFC) Staircase Method, the Two Alternative Forced Choice (2-AFC) Fixed Stimuli Method, and the Yes/No Method. It is shown that both 2-AFC methods are susceptible to attentional effects but, in contrast, the Yes/No Method may allow for the differentiation of attentional effects from sensory sensitivity and subjective criterion effects. The simulations indicate that it may be possible to control for attention effects by using Yes/No Method in combination to a 2AFC method. http://dx.doi.org/10.1038/npre.2008.1584.1 Mon, 11 Feb 2008 22:30:36 UTC Perceptual deficits and inattention in schizophrenia doi:10.1038/npre.2008.1584.1 2008-02-11 John R. Skoyles Nature Precedings 2008-02-11T22:30:36Z Manuscript Neuroscience http://creativecommons.org/licenses/by/3.0/ http://precedings.nature.com/documents/1506/version/1 Visual disappearance illusions – such as motion-induced blindness (MIB) – are commonly used to study the neural underpinnings of visual perception. In such illusions a salient visual target becomes perceptually invisible. Previous studies are inconsistent regarding the role of primary visual cortex (V1) in these illusions. Here we provide physiological and psychophysical evidence supporting a role for V1 in generating MIB. http://precedings.nature.com/documents/1506/version/1 Wed, 09 Jan 2008 22:11:41 UTC Physiological Mechanisms Underlying Motion-Induced Blindness hdl:10101/npre.2008.1506.1 2008-01-09 Camilo Libedinsky Nature Precedings 2008-01-09T22:11:41Z Manuscript Neuroscience http://creativecommons.org/licenses/by/3.0/ http://precedings.nature.com/documents/371/version/1 The freezing rotation illusion arises when a figure is continuously rotating in front of a back and forth rotating ground. The term “freezing rotation” designates the decrease in the perceived rotation speed of a figure when the figure and the ground are turning in equal directions. Subjects had to estimate the rotation speed of a continuously turning figure while the ground was either turning opposite to or with the figure. Their estimations of the figure’s speed were significantly lower, when the ground was moving in the same direction as the figure. In control experiments subjects had to estimate the ground’s speed while the figure was turning opposite to or with the ground. Overall, their estimations of the rotational speed of the ground were not significantly influenced by the rotational direction of the figure. http://precedings.nature.com/documents/371/version/1 Sun, 08 Jul 2007 07:55:18 UTC The Freezing Rotation Illusion hdl:10101/npre.2007.371.1 2007-07-08 Max R. Dürsteler Nature Precedings 2007-07-08T07:55:18Z Manuscript Neuroscience http://creativecommons.org/licenses/by/2.5/