Research Topics
| Andreas KeilSummaryAffiliation: University of Florida Country: USA Publications
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Publications
The influence of response competition on cerebral asymmetries for processing hierarchical stimuli revealed by ERP recordingsPeter Malinowski
Cognitive Neuroscience and Neuropsychology, Department of Psychology, University of Liverpool, Eleanor Rathbone Building, Liverpool L69 7ZA, UK
Exp Brain Res 144:136-9. 2002..These results underpin the idea that hemispheric differences are more likely to show up when a more elaborated stimulus representation is needed for triggering the response, that is, when a response conflict has to be resolved...
Electrocortical and electrodermal responses covary as a function of emotional arousal: a single-trial analysisAndreas Keil
NIMH Center for the Study of Emotion and Attention, University of Florida, PO Box 112766, Gainesville, FL 32611, USA
Psychophysiology 45:516-23. 2008..These results suggest that individual trials of steady-state potentials may yield reliable indices of electrocortical activity in visual cortex and that amplitude modulation of these indices varies with emotional engagement...
Tagging cortical networks in emotion: a topographical analysisAndreas Keil
Center for the Study of Emotion and Attention, University of Florida, Gainesville, FL, USA
Hum Brain Mapp 33:2920-31. 2012....- Changes in the sensitivity to appetitive and aversive arousal across adulthoodAndreas Keil
Department of Psychology and NIMH Center for the Study of Emotion and Attention, University of Florida, P O Box 112766, Gainesville, FL 32611, USA
Psychol Aging 24:668-80. 2009..e., the relationship between displeasure and arousal). These results extend previous work on emotional development, adding information as to the role of emotional intensity for affective experience in different age groups... - Adaptation in human visual cortex as a mechanism for rapid discrimination of aversive stimuliAndreas Keil
NIMH Center for the Study of Emotion and Attention, University of Florida, Gainesville, FL 32611, USA
Neuroimage 36:472-9. 2007..Our findings suggest that reorganization of neural connectivity on the level of the visual cortex acts to optimize early perception of specific features indicative of emotional relevance... - Re-entrant projections modulate visual cortex in affective perception: evidence from Granger causality analysisAndreas Keil
NIMH Center for the Study of Emotion and Attention, University of Florida, Gainesville, FL, USA
Hum Brain Mapp 30:532-40. 2009..Thus, we provide evidence for re-entrant signal flow during emotional perception, which originates from higher tiers and enters lower tiers of visual cortex... - Defensive engagement and perceptual enhancementAndreas Keil
NIMH Center for the Study of Emotion and Attention, University of Florida, Gainesville, FL 32608, USA
Neuropsychologia 48:3580-4. 2010..Acute defense facilitates visual perception of external cues and preserves accurate discrimination between threatening and safe cues... - Prolonged reduction of electrocortical activity predicts correct performance during rapid serial visual processingAndreas Keil
Department of Psychology, National Institute of Mental Health Center for the Study of Emotion and Attention, University of Florida, Gainesville, Florida 32611, USA
Psychophysiology 46:718-25. 2009..Across intertarget intervals, T2 performance was a linear function of the ssVEP amplitude reduction in correct trials, weighted by the stimulus onset asynchrony... - Feature selection in the human brain: electrophysiological correlates of sensory enhancement and feature integrationAndreas Keil
University of Florida, Gainesville, FL, USA
Brain Res 1313:172-84. 2010..Oscillatory activity in these networks is reduced by distraction and is enhanced when attended features can be mapped to specific action... - The impact of emotion on respiratory-related evoked potentialsAndreas von Leupoldt
Department of Physiological Sciences, University of Florida, Gainesville, Florida, USA
Psychophysiology 47:579-86. 2010..The results suggest that emotion impacts the perception of respiratory sensations by reducing the attentional resources available for processing afferent respiratory sensory signals... - Sustained preferential processing of social threat cues: bias without competition?Matthias J Wieser
University of Florida, USA
J Cogn Neurosci 23:1973-86. 2011..These cues, however, do not interfere with the electrocortical processing of a spatially separated concurrent face, suggesting that they are effective at capturing attention, but are weak competitors for resources... - Normal electrocortical facilitation but abnormal target identification during visual sustained attention in schizophreniaBrett A Clementz
Department of Psychology, BioImaging Research Center, University of Georgia, Athens, Georgia 30602, USA
J Neurosci 28:13411-8. 2008..These findings indicate that deficient target detection rather than compromised attentional selectivity accounts for previously reported visual attention deficits in schizophrenia... - Robust EEG preprocessing for dependence-based condition discriminationBilal H Fadlallah
Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, USA
Conf Proc IEEE Eng Med Biol Soc 2011:1407-10. 2011..We observe that the network connectivity is stable over a significant range of parameter values of the filter, thus establishing the desired robustness... - Emotional perception: correlation of functional MRI and event-related potentialsDean Sabatinelli
NIMH Center for the Study of Emotion and Attention, University of Florida, Gainesville, FL 32610, USA
Cereb Cortex 17:1085-91. 2007.... - Repetition suppression of induced gamma activity predicts enhanced orienting toward a novel stimulus in 6-month-old infantsKELLY A SNYDER
Department of Psychology, University of Denver, Denver, CO 80208, USA
J Cogn Neurosci 20:2137-52. 2008..Implications for the role of repetition suppression in infant habituation and novelty detection are discussed with respect to a biased competition model of visual attention... - Cross-modal attention capture by affective stimuli: evidence from event-related potentialsAndreas Keil
University of Florida, Gainesville, Florida, USA
Cogn Affect Behav Neurosci 7:18-24. 2007..The data support the notion that emotionally arousing stimuli transmodally attract resources, leading to optimized processing of the affective stimuli at the cost of the processing of concurrent stimuli... - Competition effects of threatening faces in social anxietyMatthias J Wieser
Center for the Study of Emotion and Attention, University of Florida, USA
Emotion 12:1050-60. 2012..It is important to note that this competition in lower tier visual cortex was maintained throughout the viewing period and was unaccompanied by competition effects on behavioral performance... - Neural substrate of the late positive potential in emotional processingYuelu Liu
The J Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, Florida 32611, USA
J Neurosci 32:14563-72. 2012.... - The neural correlates of feature-based selective attention when viewing spatially and temporally overlapping imagesJun Wang
Department of Psychology, BioImaging Research Center, University of Georgia, Athens, GA 30602, USA
Neuropsychologia 45:1393-9. 2007..Under specific conditions, however, we found increased activity to unattended stimuli. The specificity of the selective attention effects presented herein, however, may be limited under certain complex stimulus conditions... - Single-trial P300 estimation with a spatiotemporal filtering methodRuijiang Li
Computational NeuroEngineering Laboratory, University of Florida, PO Box 116130, Gainesville, FL 32611, USA
J Neurosci Methods 177:488-96. 2009..We applied the method to the estimation of the P300 component in an oddball target detection task and found that negative correlations exist between response time and single-trial P300 amplitude... - Perceiving threat in the face of safety: excitation and inhibition of conditioned fear in human visual cortexVladimir Miskovic
Center for the Study of Emotion and Attention, University of Florida, Gainesville, Florida 32611, USA
J Neurosci 33:72-8. 2013..Our findings shed light on the sensory brain dynamics associated with experience-dependent acquisition of perceptual biases for danger and safety signals... - Effects of emotional conditioning on early visual processing: temporal dynamics revealed by ERP single-trial analysisYuelu Liu
The J Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, Florida 32611, USA
Hum Brain Mapp 33:909-19. 2012..We interpret these results as providing evidence supporting the view that emotional experience can modulate early visual processing and dynamics of perceptual learning... - Cortical sources of the respiratory-related evoked potentialAndreas von Leupoldt
Department of Physiological Sciences, University of Florida, Gainesville, USA
Respir Physiol Neurobiol 170:198-201. 2010..05). The results support previous findings on the cortical sources of early RREP components Nf, P1 and N1 and demonstrate the cortical sources of later RREP components P2 and P3... - Quantifying cognitive state from EEG using dependence measuresBilal Fadlallah
Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL 32611, USA
IEEE Trans Biomed Eng 59:2773-81. 2012..Future work may use additional stimuli and experimental manipulations to determine the specificity of the current connectivity results... - Selective processing of multiple features in the human brain: effects of feature type and salienceE Menton McGinnis
National Institute of Mental Health Center for the Study of Emotion and Attention, University of Florida, Gainesville, Florida, United States of America
PLoS ONE 6:e16824. 2011.... - Estimation of instantaneous power in the EEG to assess brain connectivity with high temporal resolutionJungPhil Kwon
University of Florida, Gainesville, FL 32611, USA
Conf Proc IEEE Eng Med Biol Soc 2009:332-5. 2009..A video of the topographical display of the instantaneous power over the array helps us visualize the exquisite communication that occurs during the stimulus presentation... - Respiratory-related evoked potential measurements using high-density electroencephalographyAndreas von Leupoldt
Department of Physiological Sciences, University of Florida, Gainesville, USA
Clin Neurophysiol 122:815-8. 2011..However, the increasing availability of high-density EEG systems necessitates new criteria for obtaining acceptable RREPs with these systems... - Steady-state visual evoked potentials reveal frontally-mediated working memory activity in humansWilliam M Perlstein
Department of Clinical and Health Psychology, University of Florida, Gainesville, FL 32610, USA
Neurosci Lett 342:191-5. 2003..Frontal WM-related SSVEP power correlated selectively with task performance. These results demonstrate the utility of SSVEPs for studying representational aspects of cognition... - Social vision: sustained perceptual enhancement of affective facial cues in social anxietyLisa M McTeague
Center for the Study of Emotion and Attention, University of Florida, Gainesville, FL 32611, USA
Neuroimage 54:1615-24. 2011..This pattern was maintained across the 3500 ms viewing epoch, suggesting that temporally sustained, heightened perceptual bias towards affective facial cues is associated with generalized social anxiety... - Aberrant brain dynamics in schizophrenia: delayed buildup and prolonged decay of the visual steady-state responseBrett A Clementz
Department of Psychology, University of Georgia, Psychology Building, Athens, GA 30602 3013, USA
Brain Res Cogn Brain Res 18:121-9. 2004..These findings have implications understanding the nature of evoked response differences between schizophrenia and normal groups especially in repetitive stimulus paradigms... - An association framework to analyze dependence structure in time seriesBilal H Fadlallah
Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL 32611, USA
Conf Proc IEEE Eng Med Biol Soc 2012:6176-9. 2012..Furthermore, applying GMA and Kendall's tau to quantify dependence using the extracted envelopes of processed EEG data concords with previous findings using the signal itself... - Acquired fears reflected in cortical sensory processing: a review of electrophysiological studies of human classical conditioningVladimir Miskovic
Center for the Study of Emotion and Attention, University of Florida, Gainesville, Florida 32611, USA
Psychophysiology 49:1230-41. 2012..Putative mechanisms that may underlie fear-associated plasticity at the level of the sensory cortices are briefly considered, and several avenues for future work are outlined... - Weighted-permutation entropy: a complexity measure for time series incorporating amplitude informationBilal Fadlallah
Computational NeuroEngineering Laboratory, Department of Electrical and Computer Engineering, University of Florida, Gainesville, Florida 32611, USA
Phys Rev E Stat Nonlin Soft Matter Phys 87:022911. 2013..Results show better robustness and stability in the presence of higher levels of noise, in addition to a distinctive ability to extract complexity information from data with spiky features or having abrupt changes in magnitude... - Orienting and emotional perception: facilitation, attenuation, and interferenceMargaret M Bradley
Center for the Study of Emotion and Attention, University of Florida Gainesville, FL, USA
Front Psychol 3:493. 2012..Here, we discuss these findings, considering both physiological reflex and brain measures as they are modulated during orienting and emotional perception... - Face-evoked steady-state visual potentials: effects of presentation rate and face inversionL Forest Gruss
Department of Psychology, Center for the Study of Emotion and Attention, University of Florida Gainesville, FL, USA
Front Hum Neurosci 6:316. 2012..By contrast, lower frequency ssVEPs did not show this inversion effect. These findings suggest that stimulation frequency affects the sensitivity of ssVEPs to face inversion... - High resolution EEG indicators of pain responses in relation to hypnotic susceptibility and suggestionWilliam J Ray
Department of Psychology, Penn State University, University Park, PA 16802, USA
Biol Psychol 60:17-36. 2002.... - Modulation of induced gamma band responses in a perceptual learning task in the human EEGThomas Gruber
Cognitive Neuroscience, Department of Psychology, University of Liverpool, Eleanor Rathbone Building, Bedford Street South, Liverpool L69 7ZA, UK
J Cogn Neurosci 14:732-44. 2002..No difference between identified and unidentified pictures was found in the visual evoked potential in the same time range and in the evoked GBR in the same frequency range as the induced response... - Early modulation of visual perception by emotional arousal: evidence from steady-state visual evoked brain potentialsAndreas Keil
Department of Psychology, University of Konstanz, Konstanz, Germany
Cogn Affect Behav Neurosci 3:195-206. 2003..These findings are consistent with reentrant modulation of early visual processing by distributed networks including subcortical and neocortical structures according to a stimulus's motivational relevance... - Motivated attention in emotional picture processing is reflected by activity modulation in cortical attention networksStephan Moratti
Department of Psychology, University of Konstanz, Constance, Germany
Neuroimage 21:954-64. 2004..Taken together, we argue that activity in higher-order frontoparietal cortical attention networks is modulated by emotional arousal. In turn, this attention network influences activity in systems performing stimulus processing... - Neuronal synchronization and selective color processing in the human brainMatthias M Müller
Universitat Leipzig, Leipzig, Germany
J Cogn Neurosci 16:503-22. 2004..Our results suggest that large-scale synchronous high-frequency brain activity as measured in the human GBR play a specific role in attentive processing of stimulus features... - Brain responses to repetitions of human and animal faces, inverted faces, and objects: an MEG studyStefan R Schweinberger
Department of General Psychology, Friedrich Schiller University of Jena, Germany
Brain Res 1184:226-33. 2007..These findings suggest that repetition-sensitive brain activity approximately 250 ms reflects the transient activation of object representations, with largest responses for upright faces, in the right hemisphere... - Additive effects of emotional content and spatial selective attention on electrocortical facilitationAndreas Keil
Department of Psychology, University of Konstanz, Germany
Cereb Cortex 15:1187-97. 2005..The data suggest that affective stimulus properties modulate the spatiotemporal process along the ventral stream, encompassing amplitude amplification and timing changes of posterior and temporal cortex... - The costs of emotional attention: affective processing inhibits subsequent lexico-semantic analysisNiklas Ihssen
Department of Psychology, University of Konstanz, Konstanz, Germany
J Cogn Neurosci 19:1932-49. 2007..Thus, affective processing interferes with subsequent lexico-semantic analysis along the ventral stream... - Modulation of the C1 visual event-related component by conditioned stimuli: evidence for sensory plasticity in early affective perceptionMargarita Stolarova
University of Konstanz, Konstanz, Germany
Cereb Cortex 16:876-87. 2006..As an underlying mechanism, we discuss short-term reorganization in visual cortex, enabling sensory amplification of specific visual features that are related to motivationally relevant information... - Look-don't look! How emotional pictures affect pro- and anti-saccadesJohanna Kissler
Department of Psychology, University of Konstanz, Box D 25, 78457, Konstanz, Germany
Exp Brain Res 188:215-22. 2008..Moderating factors such as the SOA or the visual field of presentation are discussed... - Neural mechanisms of evoked oscillations: stability and interaction with transient eventsStephan Moratti
Center of Magnetoencephalography Dr Perez Modrego, Facultad de Medicina, University Complutense of Madrid, Madrid, Spain
Hum Brain Mapp 28:1318-33. 2007..We conclude that ssVEPs represent strongly phase locked oscillations sharing the same generation mechanisms as early evoked potentials... - Macroscopic brain dynamics during verbal and pictorial processing of affective stimuliAndreas Keil
Department of Psychology, University of Konstanz, PO Box D23, D 78457 Konstanz, Germany
Prog Brain Res 156:217-32. 2006..On the basis of prioritized sensory analysis for affectively relevant stimuli, subsequent steps such as working memory, motor preparation, and action may be adjusted to meet the adaptive requirements of the situation perceived... - Early cortical facilitation for emotionally arousing targets during the attentional blinkAndreas Keil
University of Konstanz, Konstanz, Germany
BMC Biol 4:23. 2006..Replicating and extending behavioral studies, we expected that emotional second targets would be associated with better identification accuracy and greater electrocortical activity, compared with neutral targets... - Mapping the brain's orchestration during speech comprehension: task-specific facilitation of regional synchrony in neural networksMarkus Härle
Department of Psychology, University of Konstanz, Germany
BMC Neurosci 5:40. 2004.... - Hypofunction of right temporoparietal cortex during emotional arousal in depressionStephan Moratti
Center of Magnetoencephalography Dr Perez Modrego, University Complutense of Madrid, Pabellón 8, Avenida Complutense, S N, 28040 Madrid, Spain
Arch Gen Psychiatry 65:532-41. 2008..These models were derived from indirect measures such as neuropsychological tests and electroencephalography alpha band power... - Alpha-band activity reflects reduction of mental effort in a comparison task: a source space analysisAndreas Keil
Department of Psychology, University of Konstanz, Konstanz, Germany
Brain Res 1121:117-27. 2006..Temporal analysis suggested that this effect was present particularly during task preparation and execution. We conclude that comparative information processing may reduce mental effort in judgment tasks... - Temporal stability of high-frequency brain oscillations in the human EEGAndreas Keil
Department of Psychology, University of Konstanz, Germany
Brain Topogr 16:101-10. 2003..We conclude that measures of high-frequency oscillatory activity as used in the cognitive neurosciences meet stability requirements necessary for meaningful interpretation of this parameter of brain function... - Acquisition of affective dispositions in dementia patientsAndreas Blessing
Department of Psychology, University of Konstanz, D-78457 Konstanz, Germany
Neuropsychologia 44:2366-73. 2006..The results suggest that acquisition and maintenance of implicit affective dispositions are preserved in dementia even when explicit memory is impaired... - Large-scale neural correlates of affective picture processingAndreas Keil
Department of Psychology, University of Konstanz, Germany
Psychophysiology 39:641-9. 2002..Sources of slow wave modulation were located in occipital and posterior parietal cortex, with a right-hemispheric dominance... - Effects of classical conditioning on identification and cortical processing of speech syllablesSabine Heim
Department of Psychology, University of Konstanz, P O Box D23, 78457 Konstanz, Germany
Exp Brain Res 175:411-24. 2006..e., the CS+, however. We conclude that training speech categorization by merely enhancing motivational relevance is not effective for conveying behavioral improvement... - Fear but not awareness predicts enhanced sensory processing in fear conditioningStephan Moratti
Department of Psychology, University of Konstanz, Konstanz, Germany
Psychophysiology 43:216-26. 2006..Participants in both groups reported awareness of CS-US contingencies. Awareness of stimulus contingency in fear conditioning seems not to be sufficient to elicit enhanced visual cortical processing... - Identification facilitation for emotionally arousing verbs during the attentional blinkAndreas Keil
Department of Psychology, University of Konstanz, Konstanz, Germany
Emotion 4:23-35. 2004..These results suggest that affectively arousing information is selected preferentially from a temporal stream, facilitating processes such as working memory consolidation and action... - Cortical activation during Pavlovian fear conditioning depends on heart rate response patterns: an MEG studyStephan Moratti
Department of Psychology, University of Konstanz, P O Box D25, D 78457 Konstanz, Germany
Brain Res Cogn Brain Res 25:459-71. 2005..The results suggest that participants expressing different HR responses also differ in their stimulus-driven neuromagnetic response pattern to an aversively conditioned stimulus... - Large-scale neural correlates of developmental dyslexiaSabine Heim
Department of Psychology, University of Konstanz, D23, 78457 Konstanz, Germany
Eur Child Adolesc Psychiatry 13:125-40. 2004..A combined approach of structural imaging and MEG, and most importantly theory driven behavioral tasks may shed light on dynamics and trajectories of the neurobiology of dyslexia...
Research Grants
- Hypervigilance versus perceptual avoidance in social phobiaAndreas Keil; Fiscal Year: 2010..Specifically, matching patients to exposure-based or cognitive treatments will benefit from information as to the nature of their hypervigilance vis--vis avoidance of social threat cues. ..