Search results for "Percept"
showing 10 items of 3839 documents
Association between DRD2/DRD4 interaction and conduct disorder: a potential developmental pathway to alcohol dependence
2013
1 Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil 2 King’s College London, Institute of Psychiatry, MRC Social Genetic and Developmental Psychiatry Centre, London, United Kingdom, UK 3 Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany 4 Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behavior, Radboud University Medical Center, Nijmegen, The Netherlands 5 Psychology Department, National University of Singapore, Singapore, Singapore 6 Department of Psychiatry, Donders Institute for Brain, Cognition an…
Fona adaptācijas ietekme uz datorizētā krāsu sakārtošanas un FM-100 testa rezultātiem
2021
Šis darbs ir uzrakstīts angļu valodā uz 25 lappusēm, 16 attēliem, 1 tabulas un 27 atsaucēm. Gandrīz daudzi cilvēki cieš no iedzimta vai iegūta krāsu redzes deficīta. Tīklenē ir fotopigments, kas ir atbildīgs par krāsu redzi, ko sauc par konusu, kurā konusos esošajam opsinam ir izšķiroša nozīme krāsu uztverē, un viss mehānisms ir pabeigts smadzeņu pakauša daivā. Šis pētījums tika veikts 15 dalībniekiem, veicot krāsu redzamības novērtējumu FM-100, kas veikts datorā ar atšķirīgu fonu, lai zinātu datorizētā izvietojuma testa fona un FM-100 krāsu redzes testa rezultātu sekas. Pētījuma secinājums par virzīšanos uz priekšu no viena testa uz otru, ti, testa rezultāts ir hromatisks vai ahromatisks, …
The self-organizing consciousness
2003
We propose that the isomorphism generally observed between the representations composing our momentary phenomenal experience and the structure of the world is the end-product of a progressive organization that emerges thanks to elementary associative processes that take our conscious representations themselves as the stuff on which they operate, a thesis that we summarize in the concept of Self-Organizing Consciousness (SOC).
The emergence of a shared action ontology: building blocks for a theory.
2003
To have an ontology is to interpret a world. In this paper we argue that the brain, viewed as a representational system aimed at interpreting our world, possesses an ontology too. It creates primitives and makes existence assumptions. It decomposes target space in a way that exhibits a certain invariance, which in turn is functionally significant. We will investigate which are the functional regularities guiding this decomposition process, by answering to the following questions: What are the explicit and implicit assumptions about the structure of reality, which at the same time shape the causal profile of the brain's motor output and its representational deep structure, in particular of t…
Physical integration: A causal account for consciousness
2014
The issue of integration in neural networks is intimately connected with that of consciousness. In this paper, integration as an effective level of physical organization is contrasted with a methodological integrative approach. Understanding how consciousness arises out of neural processes requires a model of integration in just causal physical terms. Based on a set of feasible criteria (physical grounding, causal efficacy, no circularity and scaling), a causal account of physical integration for consciousness centered on joint causation is outlined.
Semi-natural habitats in the European boreal region: Caught in the socio-ecological extinction vortex?
2022
AbstractWe propose to consider semi-natural habitats—hotspots for biodiversity—being caught in a socio-ecological extinction vortex, similar to the phenomenon described for species threatened with extinction. These habitats are essentially socioecological systems, in which socioeconomic drivers are interlinked with ecological processes. We identify four highly interlinked and mutually reinforcing socio-economic processes, pertaining to the importance of semi-natural habitats for (i) agricultural production, (ii) policy, research and development; (iii) vocational education in the fields of agricultural sciences and (iv) public’s experiences with semi-natural habitats. Evidence from six count…
Different Brain Mechanisms Mediate Sensitivity to Sensory Consonance and Harmonic Context: Evidence from Auditory Event-Related Brain Potentials
2001
Abstract The goal of this study was to analyze the time-course of sensory (bottom-up) and cognitive (top-down) processes that govern musical harmonic expectancy. Eight-chord sequences were presented to 12 musicians and 12 nonmusicians. Expectations for the last chord were manipulated both at the sensory level (i.e., the last chord was sensory consonant or dissonant) and at the cognitive level (the harmonic function of the target was varied by manipulating the harmonic context built up by the first six chords of the sequence). Changes in the harmonic function of the target chord mainly modulate the amplitude of a positive component peaking around 300 msec (P3) after target onset, reflecting …
The neural basis of sublexical speech and corresponding nonspeech processing: a combined EEG-MEG study.
2014
Abstract We addressed the neural organization of speech versus nonspeech sound processing by investigating preattentive cortical auditory processing of changes in five features of a consonant–vowel syllable (consonant, vowel, sound duration, frequency, and intensity) and their acoustically matched nonspeech counterparts in a simultaneous EEG–MEG recording of mismatch negativity (MMN/MMNm). Overall, speech–sound processing was enhanced compared to nonspeech sound processing. This effect was strongest for changes which affect word meaning (consonant, vowel, and vowel duration) in the left and for the vowel identity change in the right hemisphere also. Furthermore, in the right hemisphere, spe…
Does letter position coding depend on consonant/vowel status? Evidence with the masked priming technique
2008
Recently, a number of input coding schemes (e.g., SOLAR model, SERIOL model, open-bigram model, overlap model) have been proposed that capture the transposed-letter priming effect (i.e., faster response times for jugde-JUDGE than for jupte-JUDGE). In their current version, these coding schemes do not assume any processing differences between vowels and consonants. However, in a lexical decision task, Perea and Lupker (2004, JML; Lupker, Perea, & Davis, 2008, L&CP) reported that transposed-letter priming effects occurred for consonant transpositions but not for vowel transpositions. This finding poses a challenge for these recently proposed coding schemes. Here, we report four masked priming…
Global context effects on musical expectancy.
1997
The effects of global harmonic contexts on expectancy formation were studied in a set of three experiments. Eight-chord sequences were presented to subjects. Expectations for the last chord were varied by manipulating the harmonic context created by the first six: in one context, the last chord was part of an authentic cadence (V–I), whereas in the other, it was a fourth harmonic degree following a full cadence (I–IV). Given this change in harmonic function, the last chord was assumed to be more expected in the former context, all the other local parameters being held constant. The effect of global context on expectancy formation was supported by the fact that subjects reported a lower degr…