Mark Greenlee

Prof. Dr. Mark Greenlee

Psychology, University of Regensburg, Regensburg, Bavaria, Germany
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Research Focus & Metrics

Academic Career Length

43Years (1984-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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14 January 2005 in Nature Reviews Neuroscience
Verified
Journal Article
Closed access
TPTatiana Pasternak
Tatiana Pasternak
Mark GreenleeMark Greenlee
Mark Greenlee

1 December 2001 in Cerebral Cortex
Verified
Journal Article
Open access
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ASA.T. Smith
A.T. Smith
KSK.D. Singh
K.D. Singh
AWA.L. Williams
A.L. Williams
Mark GreenleeMark Greenlee
Mark Greenlee
Functional magnetic resonance imaging (fMRI) was used to estimate the average receptive field sizes of neurons in each of several striate and extrastriate visual areas of the human cerebral cortex. The boundaries of the visual areas were determined by retinotopic mapping procedures and were visualized on flattened representations of the occipital cortex. Estimates of receptive field size were derived from the temporal duration of the functional activation at each cortical location as a visual stimulus passed through the receptive fields represented at that location. Receptive fields are smallest in the primary visual cortex (V1). They are larger in V2, larger again in V3/VP and largest of all in areas V3A and V4. In all these areas, receptive fields increase in size with increasing stimulus eccentricity. The results are qualitatively in line with those obtained by others in macaque monkeys using neurophysiological methods.

15 May 1998 in Journal of Neuroscience
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Journal Article
Open access
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ASAndrew T. Smith
Andrew T. Smith
Mark GreenleeMark Greenlee
Mark Greenlee
KSKrish D. Singh
Krish D. Singh
FKFalk M. Kraemer
Falk M. Kraemer
JHJürgen Hennig
Jürgen Hennig
We have examined the activity levels produced in various areas of the human occipital cortex in response to various motion stimuli using functional magnetic resonance imaging (fMRI) methods. In addition to standard luminance-defined (first-order) motion, three types of second-order motion were used. The areas examined were the motion area V5 (MT) and the following areas that were delineated using retinotopic mapping procedures: V1, V2, V3, VP, V3A, and a new area that we refer to as V3B. Area V5 is strongly activated by second-order as well as by first-order motion. This activation is highly motion-specific. Areas V1 and V2 give good responses to all motion stimuli, but the activity seems to be related primarily to the local spatial and temporal structure in the image rather than to motion processing. Area V3 and its ventral counterpart VP also respond well to all our stimuli and show a slightly greater degree of motion specificity than do V1 and V2. Unlike V1 and V2, the response in V3 and VP is significantly greater for second-order motion than for first-order motion. This trend is evident, but less marked, in V3A and V3B and absent in V5. The results are consistent with the hypothesis that first-order motion sensitivity arises in V1, that second-order motion is first represented explicitly in V3 and VP, and that V5 (and perhaps also V3A and V3B) is involved in further processing of motion information, including the integration of motion signals of the two types.

2 November 2011 in The Journal of Neuroscience
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Journal Article
Open access
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SHSimon Hanslmayr
Simon Hanslmayr
GVGregor Volberg
Gregor Volberg
MWMaria Wimber
Maria Wimber
MRMarkus Raabe
Markus Raabe
Mark GreenleeMark Greenlee
Mark Greenlee
KBKarl-Heinz T. Bäuml
Karl-Heinz T. Bäuml
Previous studies demonstrated that increases in the theta frequency band with concomitant decreases in the alpha/beta frequency band indicate successful memory formation. However, little is known about the brain regions and the cognitive processes that underlie these encoding-related oscillatory memory effects. We investigated this relationship using simultaneous EEG–fMRI recordings in humans during long-term memory encoding. In line with prior studies, we demonstrate that a decrease in beta power and an increase in theta power positively predict subsequent recall. In fMRI, stronger activity in the left inferior prefrontal cortex and the right parahippocampal gyrus correlated with successful memory formation. EEG source localization revealed that the subsequent memory effect in the beta band was localized in the left inferior prefrontal cortex, whereas the effect in the theta band was localized in medial temporal lobe regions. Trial-by-trial correlations between EEG and BOLD activity showed that beta power correlated negatively with left inferior prefrontal cortex activity. This correlation was more pronounced for items that could later be successfully recalled compared to items later forgotten. Based on these findings, we suggest that beta oscillations in the left inferior prefrontal cortex indicate semantic encoding processes, whereas theta oscillations in the medial temporal lobe reflect the binding of an item to its spatiotemporal context.

1 November 2013 in Current Biology
Verified
Journal Article
Closed access
SHSimon Hanslmayr
Simon Hanslmayr
GVGregor Volberg
Gregor Volberg
MWMaria Wimber
Maria Wimber
SDSarang S. Dalal
Sarang S. Dalal
Mark GreenleeMark Greenlee
Mark Greenlee

1 April 2002 in Cognitive Brain Research
Verified
Journal Article
Closed access
MKMarkus Knauff
Markus Knauff
TMThomas Mulack
Thomas Mulack
JKJan Kassubek
Jan Kassubek
HSHelmut R Salih
Helmut R Salih
Mark GreenleeMark Greenlee
Mark Greenlee