New paper in press at eNeuro: Herbst, Fiedler and Obleser on tracking temporal hazard in the human EEG
Here, we show that human participants use implicit modulations of temporal hazard, the probability of an item to occur at a certain moment in time given it has not yet occurred, when performing a pitch discrimination task. Using an encoding model approach allows us to isolate the tracking of temporal hazard by the time domain EEG signal, notably by the supplementary motor area, a region known for its implication in timing.
The paper is available as preprint:
Herbst SK, Fiedler L & Obleser J (2018), Tracking temporal hazard in the human electroencephalogram using a forward encoding model. eNeuro (in press).
New paper in press in Brain Stimulation: Wöstmann, Vosskuhl, Obleser, and Herrmann demonstrate that externally amplified oscillations affect auditory spatial attention
In a fine collaboration we combine expertise on auditory cognition (Malte Wöstmann & Jonas Obleser, University of Lübeck) and brain stimulation (Johannes Vosskuhl and Christoph S Herrmann, University of Oldenburg) to show that externally stimulated alpha and gamma oscillations differentially affect spatial attention to speech. Our participants performed a dichotic listening task while being stimulated using transcranial alternating current stimulation (tACS) at alpha or gamma frequency (vs sham) on the left hemisphere. Alpha-tACS relatively decreased recall of targets contralateral to stimulation, while gamma-tACS reversed this effect. These results suggest that externally amplified oscillations are functionally relevant to spatial attention.
Wöstmann, M., Vosskuhl, J., Obleser, J., & Herrmann, C.S. (2018). Opposite effects of lateralised transcranial alpha versus gamma stimulation on auditory spatial attention.
Now available online:
During the upcoming meeting of “Psychology and the Brain 2018”, PhD student Leo Waschke will be hosting a symposium on states and traits of neural activity and their functional relevance for perception and ageing. Together with Linda Geerligs (Donders Institute, NL), Marieke Schölvinck (ESI, Frankfurt) and Niels Kloosterman (MPIB, Berlin) he will be addressing fluctuations in brain activity on a host of timescales from milliseconds to minutes. We are looking forward to meeting you in Giessen.
AC postdocs Sarah Tune and Malte Wöstmann have a new paper out online in the special issue on Neural Oscillations in the European Journal of Neuroscience! We are excited to share the results from our first study of the ERC-funded project on listening behavior and adaptive control in middle-aged adults. In this study, we asked whether the fidelity of alpha power lateralization would serve as a neural marker of selective auditory attention in the ageing listener. The results of our multivariate approach demonstrate that understanding inter-individual differences is paramount to understanding of the role of alpha oscillations in auditory attention across age.
Tune, S., Wöstmann, W., & Obleser, J. (2018) Probing the limits of alpha power lateralisation as a neural marker of selective attention in middle-aged and older listeners.
Now available online:
Obleserlab postdoc Mohsen Alavash and Obleserlab Alumna Sung-Joo Lim are in press at Neuroimage!
They argue with data from a placebo-controlled dopaminergic intervention study that BOLD signal variability and the functional connectome are surprisingly clearly affected by L-Dopa, and (ii) that the degree of change in these metrics can explain the degree to which individuals will profit from L-DOPA in performing the challenging listening task (while others dont; Preprint here ).
Alavash, M., Lim, S.J., Thiel, C., Sehm, B., Deserno, L., & Obleser, J. (2018) Dopaminergic modulation of hemodynamic signal variability and the functional connectome during cognitive performance. Neuroimage. In press.
— Thanks also and in particular to our colleagues Christiane Thiel of Oldenburg, and Bernhard Sehm and Lorenz Deserno of Leipzig, who helped us made this large-scale L-DOPA project happen!