User profiles for Torfi Sigurdsson

Torfi Sigurdsson

Goethe University Frankfurt
Verified email at em.uni-frankfurt.de
Cited by 2619

Impaired hippocampal–prefrontal synchrony in a genetic mouse model of schizophrenia

T Sigurdsson, KL Stark, M Karayiorgou, JA Gogos… - Nature, 2010 - nature.com
Abnormalities in functional connectivity between brain areas have been postulated as an
important pathophysiological mechanism underlying schizophrenia 1 , 2 . In particular, …

[HTML][HTML] Hippocampal-prefrontal interactions in cognition, behavior and psychiatric disease

T Sigurdsson, S Duvarci - Frontiers in systems neuroscience, 2016 - frontiersin.org
The hippocampus and prefrontal cortex (PFC) have long been known to play a central role
in various behavioral and cognitive functions. More recently, electrophysiological and …

Attenuation of responses to self-generated sounds in auditory cortical neurons

BP Rummell, JL Klee, T Sigurdsson - Journal of Neuroscience, 2016 - Soc Neuroscience
Many of the sounds that we perceive are caused by our own actions, for example when
speaking or moving, and must be distinguished from sounds caused by external events. Studies …

Theta oscillations in the medial prefrontal cortex are modulated by spatial working memory and synchronize with the hippocampus through its ventral subregion

PK O'Neill, JA Gordon, T Sigurdsson - Journal of Neuroscience, 2013 - Soc Neuroscience
The rodent medial prefrontal cortex (mPFC) is critical for spatial working memory (SWM), but
the underlying neural processes are incompletely understood. During SWM tasks, neural …

Resolving the prefrontal mechanisms of adaptive cognitive behaviors: A cross-species perspective

IL Hanganu-Opatz, T Klausberger, T Sigurdsson… - Neuron, 2023 - cell.com
The prefrontal cortex (PFC) enables a staggering variety of complex behaviors, such as
planning actions, solving problems, and adapting to new situations according to external …

Long-term potentiation in the amygdala: a cellular mechanism of fear learning and memory

T Sigurdsson, V Doyère, CK Cain, JE LeDoux - Neuropharmacology, 2007 - Elsevier
Much of the research on long-term potentiation (LTP) is motivated by the question of
whether changes in synaptic strength similar to LTP underlie learning and memory. Here we …

Dopamine neurons drive fear extinction learning by signaling the omission of expected aversive outcomes

…, P Vogel, S Betz, R Kalisch, T Sigurdsson… - Elife, 2018 - elifesciences.org
10.7554/eLife.38818.001 Extinction of fear responses is critical for adaptive behavior and
deficits in this form of safety learning are hallmark of anxiety disorders. However, the neuronal …

Cross-correlation of instantaneous amplitudes of field potential oscillations: a straightforward method to estimate the directionality and lag between brain areas

A Adhikari, T Sigurdsson, MA Topiwala… - Journal of neuroscience …, 2010 - Elsevier
Researchers performing multi-site recordings are often interested in identifying the directionality
of functional connectivity and estimating lags between sites. Current techniques for …

Chronic antidepressant treatment impairs the acquisition of fear extinction

NS Burghardt, T Sigurdsson, JM Gorman… - Biological …, 2013 - Elsevier
BACKGROUND: Like fear conditioning, the acquisition phase of extinction involves new
learning that is mediated by the amygdala. During extinction training, the conditioned stimulus is …

Long‐term potentiation in freely moving rats reveals asymmetries in thalamic and cortical inputs to the lateral amygdala

V Doyère, GE Schafe, T Sigurdsson… - European Journal of …, 2003 - Wiley Online Library
Long‐term memory underlying Pavlovian fear conditioning is believed to involve plasticity at
sensory input synapses in the lateral nucleus of the amygdala (LA). A useful physiological …