Coherent EEG Indicators of Cognitive Binding during Ambiguous Figure Tasks

Klemm, W. R.; Li, Tianruo; Hernandez, Jason

doi:10.1006/ccog.1999.0426

Cited by 32 publications

(18 citation statements)

References 29 publications

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“…When perception switches between alternative interpretations it usually does so as a whole, implying that all the distinct decisions that this involves are coordinated by some form of contextual modulation that maximizes coherence over the figure as a whole (Klemm, Li and Hernandez, 2000). Studies of multistable perception provide much evidence for a strong bias towards those interpretations that are more probable given the context (Schwartz et al, 2012).…”

Section: Contextual Disambiguation In Perceptionmentioning

confidence: 99%

On the functions, mechanisms, and malfunctions of intracortical contextual modulation

Phillips

Clark

Silverstein

2015

Neuroscience & Biobehavioral Reviews

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A broad neuron-centric conception of contextual modulation is reviewed and re-assessed in the light of recent neurobiological studies of amplification, suppression, and synchronization. Behavioural and computational studies of perceptual and higher cognitive functions that depend on these processes are outlined, and evidence that those functions and their neuronal mechanisms are impaired in schizophrenia is summarized. Finally, we compare and assess the long-term biological functions of contextual modulation at the level of computational theory as formalized by the theories of coherent infomax and free energy reduction. We conclude that those theories, together with the many empirical findings reviewed, show how contextual modulation at the neuronal level enables the cortex to flexibly adapt the use of its knowledge to current circumstances by amplifying and grouping relevant activities and by suppressing irrelevant activities.

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Section: Contextual Disambiguation In Perceptionmentioning

confidence: 99%

On the functions, mechanisms, and malfunctions of intracortical contextual modulation

Phillips

Clark

Silverstein

2015

Neuroscience & Biobehavioral Reviews

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“…For example, Lutzenberger et al (1995) reported that Gamma activity was enhanced over the occipital electrodes for bars that were moving with a regular rather than irregular frequency and that Gamma activity is greater at occipitotemporal electrode sites when subjects are exposed to a single bar that moves across the sites compared to two incoherently moving bars (Muller et al, 1999). Similarly, Klemm et al (2000) proved coherent Gamma activity in a study of riddling figure task in which subjects were asked to push the button when they perceived a hidden alternative image in the stimulus. Greater Gamma coherence was observed in the midst of frontal, parietal, central and occipital regions of both hemispheres.…”

Section: Gamma Activity and Brain Functionsmentioning

confidence: 99%

“…Nevertheless even conscious experience creates this unity recent evidence indicates that the neural correlate of consciousness likely is not represented in a particular brain region that would enable to integrate distributed information during sensory processing (Klemm, Li, & Hernandez, 2000;Von Der Malsburg, 1999;Singer & Gray, 1995). This time and spatial integration of brain functions related to perception, cognition, consciousness and memory is likely related to frequency oscillations (30-90Hz, typically at about 40Hz) in electrical brain activity that occurs synchronously in cycles across various brain regions (Singer & Gray, 1995) and is linked to binding of individual brain functions, the integration of brain activities and composition of neuronal networks (Engel et al, 1997;Von Der Malsburg, 1999).…”

Section: Introductionmentioning

confidence: 99%

“Split Mind” and EEG Gamma Activity in Schizophrenia

Simek

2014

Act Nerv Super

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Synchronous high frequency (Gamma band) activity has been proposed as a candidate mechanism for the integration or 'binding' of distributed brain activities that are closely related to integrative cognitive processing and conscious awareness which is significantly affected in schizophrenia. According to recent evidence schizophrenia is related to temporal disintegration of brain networks which is closely linked to cognitive dysmetria to abnormal integration of sensory input with stored information. These findings indicate that disconnection and disturbed gamma synchrony and neural binding may represent a specific correlate of mental disintegration in schizophrenia. From historical perspectives these findings are in agreement with basic thinking about schizophrenia that was proposed by Bleuler when he introduced the term schizophrenia as "split mind". These data have important implications for understanding of basic mechanism related to schizophrenia and also its therapy that in the future perspectives might be much focused on specific influences on cognitive functions using psychotherapeutic approaches in close correspondence with pharmacological treatment strategies.

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“…The neurobiological data on rhythmic activity in relation to perception of ambiguous figures are presented in the papers (Keil et al 1999;Klemm et al 2000;Nakatani and van Leeuwen 2006). It was reported earlier that the enhancement of gamma activity takes place in the frontal region during perceptual switching.…”

Section: Experimental Data On Perceptual Bistability For Designing Thmentioning

confidence: 99%

“…They demonstrate that switching-related gamma band synchrony in parietal and frontal areas has a systematic relationships with transient alpha band activity in the occipital area. Klemm et al (2000) tested the hypothesis that perceptual alternations in ambiguous figures correlate with the gamma rhythm and its synchronization over multiple scalp sites ("cognitive binding"). They compared EEG recordings under ambiguous figure stimulation with control experiments (reaction time to sound and no-task experiment) and demonstrated the enhancement of gamma band activity in stimulations by ambiguous figures.…”

Section: Experimental Data On Perceptual Bistability For Designing Thmentioning

confidence: 99%

Visual perception of ambiguous figures: synchronization based neural models

2009

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We develop and study two neural network models of perceptual alternations. Both models have a star-like architecture of connections with a central element connected to a set of peripheral elements. A particular perception is simulated in terms of partial synchronization between the central element and some sub-group of peripheral elements. The first model is constructed from phase oscillators and the mechanism of perceptual alternations is based on chaotic intermittency under fixed parameter values. Similar to experimental evidence, the distribution of times between perceptual alternations is represented by the gamma distribution. The second model is built of spiking neurons of the Hodgkin-Huxley type. The mechanism of perceptual alternations is based on plasticity of inhibitory synapses which increases the inhibition from the central unit to the neural assembly representing the current percept. As a result another perception is formed. Simulations show that the second model is in good agreement with behavioural data on switching times between percepts of ambiguous figures and with experimental results on binocular rivalry of two and four percepts.

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Coherent EEG Indicators of Cognitive Binding during Ambiguous Figure Tasks

Cited by 32 publications

References 29 publications

On the functions, mechanisms, and malfunctions of intracortical contextual modulation

On the functions, mechanisms, and malfunctions of intracortical contextual modulation

“Split Mind” and EEG Gamma Activity in Schizophrenia

Visual perception of ambiguous figures: synchronization based neural models

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