New paper in The Journal of Neuroscience: Wilsch et al.., Temporal expectation modulates the cortical dynamics of short-term memory
Congratulations to Obleserlab alumna Anna Wilsch, who is – for now – leaving academia on a true high with her latest offering on how temporal expectations (“foreknowledge” about when something is to happen) shape the neural make-up of memory!
Recorded while the Obleserlab was still in Leipzig at the Max Planck, and analysed with great input from our co-authors Molly Henry, Björn Herrmann as well as Christoph Herrmann (Oldenburg), Anna used Magnetoencephalography in an intricate but ultimately very simple sensory-memory paradigm.
While sensory memories of the physical world fade quickly, Anna here shows that this decay of short-term memory can be counteracted by temporal expectation.
Notably, spatially distributed cortical patterns of alpha (8−−13 Hz) power showed opposing effects in auditory vs. visual sensory cortices. Moreover, alpha-tuned connectivity changes within supramodal attention networks reflect the allocation of neural resources as short-term memory representations fade.
— to be updated as the paper will become available online –
New paper in Ear and Hearing: Erb, Ludwig, Kunke, Fuchs & Obleser on speech comprehension with a cochlear implant
We are excited to share the results from our collaboration with the Cochlea Implant Center Leipzig: AC postdoc Julia Erb’s new paper on how 4-Hz modulation sensitivity can inform us on 6-month speech comprehension outcome in cochlear implants.
Erb J, Ludwig AA, Kunke D, Fuchs M, & Obleser J (2018). Temporal sensitivity measured shortly after cochlear implantation predicts six-month speech recognition outcome
Now available online:
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.