Browsing School of Psychology by Author "Elliott, Mark"
Now showing items 21-40 of 51
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Evidence for 40-Hz oscillatory short-term visual memory revealed by human reaction-time measurements
Elliott, Mark (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
Elliott, Mark (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.
Elliott, Mark (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.
Elliott, Mark (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
Elliott, Mark (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
Elliott, Mark (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 ... -
Flicker-induced color and form: Interdependencies and relation to stimulation frequency and phase
Elliott, Mark (Elsevier, 2006-03)Our understanding of human visual perception generally rests on the assumption that conscious visual states represent the interaction of spatial structures in the environment and our nervous system. This assumption is ... -
Increased perceptual resolution: temporal event structure coding in autism spectrum disorders
Elliott, Mark (Public Library of Science, 2012-03-21)Cognitive functions that rely on accurate sequencing of events, such as action planning and execution, verbal and nonverbal communication, and social interaction rely on well-tuned coding of temporal event-structure. Visual ... -
An investigation of cognitive dysmetria in developmental dyslexia
Shanagher, Louise; Elliott, Mark (Pion Ltd, 2006)An alternative to theories positing visual or phonological deficits, the 'cognitive dysmetria' hypothesis proposes the aetiology of dyslexia to take the form of a general functional coordination deficit or cognitive ... -
The loci of oscillatory visual-object priming: a combined electroencephalographic and reaction-time study
Elliott, Mark (Elsevier, 2000-12)The detection of reaction-times (RTs) to a target Kanizsa-type square (an illusory square defined by the collinear arrangement of 90° corner junctions) within a matrix of distractor junctions are expedited when the target ... -
Low time resolution in schizophrenia: Lengthened windows of simultaneity for visual, auditory and bimodal stimuli
Elliott, Mark (Elsevier, 2007-12)The guarantee of perceptual coherence for events through everyday life situations depends upon the capacity to correctly integrate series of multi-sensory experiences. Patients with schizophrenia have been shown to reveal ... -
Low-level temporal coding impairments in psychosis: Preliminary findings and recommendations for further studies.
Schmidt, Heike; McFarland, John; Ahmed, Mohamed; Elliott, Mark (American Psychological AssociationThis article may not exactly replicate the final version published in the APA journal. It is not the copy of record, 2011)We investigated whether difficulties with temporal event-coding, previously reported in patients with schizophrenia, are already present during first-episode psychosis (FEP). In this experiment, the subjective judgements ... -
Modeling as part of perception: a hypothesis on the function of neural oscillations
Elliott, Mark (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
Elliott, Mark (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
Elliott, Mark (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 ... -
Oscillatory priming and form complexity
Elliott, Mark (Psychonomic Society, 2007-02)Detection of a target grouping is expedited when the target display is preceded by presentation of an oscillating premask that includes priming elements presented intraphasically and below detection threshold at the display ... -
Prefrontal cortex and the generation of oscillatory visual persistence
Elliott, Mark (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
Elliott, Mark (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 ... -
Process timing and its relation to the coding of tonal harmony.
Elliott, Mark (American Psychological Association, 2010)Advances in auditory research suggest that gamma-band synchronization of frequency-specific cortical loci could be responsible for the integration of pure tones (harmonics) into harmonic complex tones. Thus far, evidence ... -
Process timing and its relation to the perception of tonal harmony
Elliott, Mark (Editora Legis Summa Ltda, 2002)Recent advances in auditory research suggest that gamma-band synchronization of frequency-specific cortical loci could be responsible for the integration of pure tones (harmonics) into harmonic complex tones. Thus far, ...