Browsing by Subject "Psychophysics"
Now showing items 1-20 of 24
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Can we explain cross-modal representation with neural algorithms alone?: Commentary on Paillard
(North-Holland, 1999)Recent research in both psychophysics and electrophysiology has revealed a number of examples in which behaviour is guided by (i.e. Spence & Driver, 1996), and brain activity has been argued to correlate with, the formation ... -
Closure of salient regions determines search for a collinear target configuration
(Psychonomic Society, 2007-01)Grouping operations offer an effective mechanism by which to structure complex visual scenes. Among the various principles that support element integration, closure may be regarded as a main factor in shape extraction. In ... -
The computation of shape orientation in search for Kanizsa figures
(Pion Ltd, 2009-01-29)Previous studies of visual search for illusory figures have provided equivocal results, with efficient search for Kanizsa squares (eg Davis and Driver, 1994 Nature 371 291-293) contrasting with inefficient search for Kanizsa ... -
Defining perceptual synchrony
(Kijima Printing Co., 2007)How does neuronal activity bring about the interpretation of visual space in terms of objects or complex perceptual events? If they group, simple visual features can bring about the integration of spikes from neurons ... -
Effects of stimulus synchrony on mechanisms of perceptual organization
(Taylor & Francis, 2001-06-05)When neurons adopt a synchronized, oscillatory response to stimulus Gestalten, the phase of those oscillations almost always varies relative to stimulus activity. This has been taken to indicate that form-coding mechanisms ... -
The effects of subthreshold synchrony on the perception of simultaneity.
(Springer, 2007)We aimed to examine the effects of subthreshold synchrony and asynchrony on the perception of simultaneity. We rendered simultaneous or asynchronous luminance changes below detection thresholds by embedding them in a ... -
Electrophysiological correlates of flicker-induced form hallucinations
(The International Society for Psychophysics, 2010-10)Form hallucinations can be reliably induced using temporally modulated light within a specific frequency range (15-30Hz). The neural substrates of such states have yet to be established with certainty. Brain activity of 5 ... -
Evidence for 40-Hz oscillatory short-term visual memory revealed by human reaction-time measurements
(American Psychological Association, 2000-05)Four experiments show that presentation of a synchronous premask frame within a 40-Hz, flickering premask matrix primes subsequent detection of a Kanizsa-type square by generation of a 40-Hz prime. Reaction time (RT) priming ... -
Evidence for impaired integration-segmentation processes and slowed synchrony coding in dyslexics
(Pabst Science Publishers, 2001)Using a primed figure-detection task we were able to reveal the existence of two distinct groups of dyslexics. One group is characterized by a significant impairment of visual integration-segmentation processes, resulting ... -
Evidence for impaired visuo-perceptual organization in developmental dyslexics and its relation to temporal processes.
(Taylor & Francis, 2005-07)An analysis of normal and dyslexic readers' reaction-time (RT) performance in a standard visualdetection task (Experiment A) and in temporally primed visual detection (Experiment B) reveals a tendency for significantly ... -
Expectancy, not memory determines identical search rates in static and dynamic displays.
(International Society for Psychophysics, 2005)Search rates are often used as a measure of search efficiency. Horowitz & Wolfe employed this measure to compare static and dynamic visual search (Horowitz & Wolfe, 1998). Based on identical search rates, they argued that ... -
Extended visual simultaneity thresholds in patients with schizophrenia
(Oxford University Press, 2009-07)Clinical observations suggest that the experience of time phenomenology is disturbed in schizophrenia, possibly originating disorders in dynamic cognitive functions such as language or motor planning. We examined the ... -
Fechner's colors are induced by flickering monochromatic light
(Pabst Science Publishers, 2001)Fechner described the phenomenon of inducing illusory colors by means of rotating blackand- white disks. The induced spectral illusions were later termed "Fechner's colors". Similar color perceptions can be induced by ... -
Modeling as part of perception: a hypothesis on the function of neural oscillations
(Pabst Science Publishers, 2001)We argue that the effectiveness of synchronization of oscillatory neural activities coding simple features, as it relates to perceptual organization, may originate in the temporal characteristics of resonance that develops ... -
A moment to reflect upon perceptual synchrony
(MIT Press, 2006-10)How does neuronal activity bring about the interpretation of visual space in terms of objects or complex perceptual events? If they group, simple visual features can bring about the integration of spikes from neurons ... -
New measures of functional (but not perceptual) continuity in visual grouping
(International Society for Psychophysics, 2004)The benzodiazepine, Lorazepam enhances the efficiency of inhibitory GABA-A synapses in the cortex, which stabilize postsynaptic, excitatory activity by synchronizing their own discharges at around 40 Hz. Lorazepam treatment ... -
Prefrontal cortex and the generation of oscillatory visual persistence
(Cambridge University Press, 2003-12-01)In this commentary, the formation of "pre-iconic" visual-prime persistence is described in the context of prime-specific, independent-component activation at prefrontal and posterior EEG-recording sites. Although this ... -
Prefrontal cortex and the generation of oscillatory visual persistence
(Cambridge University Press, 2003)In this commentary, the formation of ¿pre-iconic¿ visual-prime persistence is described in the context of prime-specific, independent-component activation at prefrontal and posterior EEG-recording sites. Although this ... -
Some effects of negative delays upon the perception of causal relatedness
(The International Society for Psychophysics, 2004)We examined the effects of negative delays on the perception of causality using a variation of the paradigm originated by Michotte (1954) and as an extension to similar work conducted by Kanizsa and Vicario (1968). In our ... -
Structural imbalance and aesthetic preference in domestic chicks
(The International Society for Psychophysics, 2010-10)In Arnheim¿s (1954/1974) theory of structural balance, an image is more aesthetically pleasing when it demonstrates balance between multiple internal sources of directed perceptual force. Areas of balance and preferred ...