Themen für Masterarbeiten

Beschreibung: Top-down predictions of future events based on prior experience can help to allocate limited attentional resources more efficiently and are thought to be implemented as mental templates stored in memory. Previous research suggests that the reactivation of a mental template into working memory in anticipation of a corresponding task-relevant event is supported by increased fronto-parietal theta coherence and that the matching process between such a memory template and the bottom-up sensory information is reflected by increased theta-gamma coupling in early visual areas shortly after. Evidence for this model of memory matching in visual perception, however, has remained correlative so far. Master?s theses related to this topic can be offered to 1-2 students and could investigate the causal relevance of fronto-parietal theta coherence and/or parieto-occipital theta-gamma coupling by applying transcranial magnetic stimulation (TMS) over frontal areas and/or parieto-occipital areas to interrupt template reactivation and/or matching processes, respectively, and by investigating the effects of TMS stimulation on electroencephalographic (EEG) fronto-parietal theta coherence, parieto-occipital theta-gamma coupling and/or behavioral performance in a template-guided visual search task. Literature: [1] Sauseng, P., Klimesch, W., Gruber, W. R., & Birbaumer, N. (2008). Cross-frequency phase synchronization: a brain mechanism of memory matching and attention. Neuroimage, 40(1), 308-317. [2] Holz, E. M., Glennon, M., Prendergast, K., & Sauseng, P. (2010). Theta?gamma phase synchronization during memory matching in visual working memory. Neuroimage, 52(1), 326-335. [3] Sauseng, P., Griesmayr, B., Freunberger, R., & Klimesch, W. (2010). Control mechanisms in working memory: a possible function of EEG theta oscillations. Neuroscience & Biobehavioral Reviews, 34(7), 1015-1022. [4] Sauseng, P., Conci, M., Wild, B., & Geyer, T. (2015). Predictive coding in visual search as revealed by cross-frequency EEG phase synchronization. Frontiers in Psychology, 6, 1655. [5] Peylo, C., Friedrich, E. V., Minarik, T., Biel, A. L., & Sauseng, P. (2022). Theta:gamma phase coupling and evoked gamma activity reflect the fidelity of mental templates during memory matching in visual perception. Cerebral Cortex, 32(19), 4156-4171.
Anzahl Arbeiten für dieses Thema: 1-2
Zeitrahmen: FS2024-FS2025
Eingabedatum: 01.11.2023
Kontakt: Dr. Charline Peylo, E-Mail

Beschreibung: Neuronal communication is supposed to rely on synchronized (i.e., coherent) activity between interacting neural populations. In line with this assumption, previous studies have found increased alpha coherence between visual and motor areas during successful visuomotor integration (e.g., when participants correctly use visual feedback to adjust motor outputs). The causal relevance and driving factors of this signature, however, remain a matter of ongoing research. Master?s theses related to this topic can be offered to 1-2 students and could investigate the causal relevance and driving factors of centro-occipital alpha coherence for visuomotor integration by applying 10 Hz transcranial magnetic stimulation (TMS) over visual and motor areas while participants perform a visuomotor task and by investigating TMS effects on electroencephalographic (EEG) centro-occipital alpha coherence and/or behavioral performance. Literature: [1] Hummel, F., & Gerloff, C. (2005). Larger interregional synchrony is associated with greater behavioral success in a complex sensory integration task in humans. Cerebral Cortex, 15(5), 670-678. [2] Blum, J., Lutz, K., & Jäncke, L. (2007). Coherence and phase locking of intracerebral activation during visuo-and audio-motor learning of continuous tracking movements. Experimental brain research, 182, 59-69. [3] Rilk, A. J., Soekadar, S. R., Sauseng, P., & Plewnia, C. (2011). Alpha coherence predicts accuracy during a visuomotor tracking task. Neuropsychologia, 49(13), 3704-3709.
Anzahl Arbeiten für dieses Thema: 1-2
Zeitrahmen: FS2024-FS2025
Eingabedatum: 01.11.2023
Kontakt: Dr. Charline Peylo, E-Mail

Beschreibung: The medial prefrontal cortex is very prominent in controlling a range of different cognitive processes. When it comes to the control of our behaviour, an essential key component is the intentional inhibition of actions. This project shall address the role of medial prefrontal cortex in controlling the activity level of primary motor cortex when healthy, young volunteers are either instructed to execute complex finger movements versus when they are told to actively withhold action execution. Thereby, interaction of prefrontal cortex will be investigated using EEG recordings (first MSc project) and functional near infrared spectroscopy (fNIRS) ? a method of non-invasively measuring blood oxygenation in the cortex (second MSc project).
Anzahl Arbeiten für dieses Thema: 2
Zeitrahmen: FS2024-FS2025
Eingabedatum: 01.11.2023
Kontakt: Prof. Paul Sauseng, E-Mail

Beschreibung: We can flexibly encode, store and process different components of visual information in working memory. Thereby, it turns out that the exact location and the specific shape of visual items are processed in different regions (even entirely different streams) of the visual system. If we focus on processing one dimension of visual information, we will have to activate the respective visual brain regions but at the same time also inhibit brain regions that are processing any other dimension of this visual information. Although it is relatively well known which brain areas are involved in these processes, the exact mechanism *how* the brain flexibly selects processing of the one or the other dimension and, thus, activates or inhibits respective brain areas is still unclear. In this project a study will be implemented and carried out in which EEG is recorded from healthy, young volunteers while they are performing a visual working memory task (requiring the flexible processing of either location or shape of visual items). EEG will then be pre-processed and analysed. One MSc candidate on this study can investigate amplitude of so called alpha activity in the EEG as a proxy of cortical activation/deactivation of parietal and occipital-temporal brain regions and can determine whether the ratio of activation and deactivation predicts how well participants are doing on the task. A second MSc candidate can focus their analysis on interactions between prefrontal and visual cortical areas to find out whether and how the prefrontal cortex controls the activation level of posterior brain regions.
Anzahl Arbeiten für dieses Thema: 2
Zeitrahmen: FS2024-FS2025
Eingabedatum: 01.11.2023
Kontakt: Prof. Paul Sauseng, E-Mail

Beschreibung: Our perception, our attention and our memory are strongly determined by actions that will result from these cognitive functions. Therefore, it is assumed that action plans bias memory representations. Recently, it has been shown in a series of studies that visual working memory traces (in visual brain areas) can be supported and even shielded from interference by action plans (in cortical motor areas). Here, in young, healthy volunteers we will use transcranial magnetic stimulation over the motor cortex in an attempt to transiently ?knock out? action plans associated with visual working memory representations. We assume that this will lead to a weakening of working memory traces and particularly a higher vulnerability to interference. One MSc candidate can be assigned to the study. A TMS experiment will be designed, implemented and carried out. Resulting behavioural working memory parameters will be obtained and analysed.
Anzahl Arbeiten für dieses Thema: 1
Zeitrahmen: FS2024-FS2025
Eingabedatum: 01.11.2023
Kontakt: Prof. Paul Sauseng, E-Mail