Dr. rer. nat. Gregor Volberg, Dipl.-Psych.

Courses

SS 2013

Aufgrund meiner Vertretungsprofessur an der Friedrich-Schiller Universität in Jena halte ich in diesem Semester keine Lehre in Regensburg.

WS 2012/13

SS 2012

Research focus

• Visual neuroscience
• New techniques of electroencephalogram (EEG) analysis

Current projects

• Neural mechanisms of contour integration

  Contour integration is an intermediate step in object recognition by which segmented outlines of an object are integrated. We investigate the neural mechanisms of contour integration by means of psychophysical studies, as well as EEG and fMRI experiments. Open questions are, e.g., the interplay of local (bottom-up) and global (top-down) mechanisms of contour detection, or the underlying neural dynamics.

• Grapheme-color synesthesia

  Grapheme-color synesthesia is a neurological phenomenon where subjects perceive a concurrent color when viewing objectively uncolored numbers or letters. We investigate short- and long-range synchrony of EEG oscillations within synesthetes. Furthermore, we explore the role of spatial attention for the emergence of the synesthetic color impression.

Journal articles

• Hanslmayr, S., Volberg, G., Wimber, M., Raabe, M., Greenlee, M. W., & Bäuml, K. H. T. (2011). The relationship between brain oscillations and BOLD signal during memory formation: A combined EEG-fMRI study. The Journal of Neuroscience. 31(44), 15674 –15680.
  doi:10.1523/JNEUROSCI.3140-11.2011
• Frank, G., Kleinjung, T., Landgrebe, M., Vielsmeier, V., Steffenhagen, C., Burger, J., Frank, E., Volberg, G., Hajak, G., & Langguth, B. (2010). Left temporal low-frequency rTMS for the treatment of tinnitus: clinical predictors of treatment outcome - a retrospective study. European Journal of Neurology, 17(7): 951-956. doi:10.1111/j.1468-1331.2010.02956.x
• Volberg, G., Kliegl, K., Hanslmayr, S., & Greenlee, M. W. (2009). EEG Alpha Oscillations in the Preparation for Global and Local Processing Predict Behavioral Performance. Human Brain Mapping, 30(7):2173-2183. doi:10.1002/hbm.20659
• Hübner, R., Volberg, G., & Studer, T. (2007). Hemispheric differences for global/local processing in divided attention tasks: Further evidence for the integration theory. Perception & Psychophysics, 69(3), 413-421. doi:10.3758/BF03193762
• Volberg, G., & Hübner, R. (2007). Do the hemispheres differ in their  preparation for global/local processing? Experimental Brain Research, 176(3), 525-531. doi:10.1007/s00221-006-0796-9
• Volberg, G., & Hübner, R. (2007). Deconfounding the Effects of Congruency and Task Difficulty on Hemispheric Differences in Global/Local Processing. Experimental Psychology, 54(1), 83-88. doi:10.1027/1618-3169.54.1.83
• Volberg, G., & Hübner, R., (2006). Hemispheric differences for the integration of stimulus levels and their contents: evidence from bilateral presentations. Perception & Psychophysics, 68(8), 1274-1285. doi:10.3758/BF03193727
• Hübner, R., & Volberg, G. (2005). The Integration of Object Levels and Their Content: A Theory of Global/Local Processing and Related Hemispheric Differences. Journal of Experimental Psychology: Human Perception and Performance, 31(3), 520-541. doi:10.1037/0096-1523.31.3.520
• Volberg, G., & Hübner, R. (2004). On the role of response conflicts and stimulus position for hemispheric differences in global/local processing: an ERP study. Neuropsychologia, 42(13), 1805-1813. doi:10.1016/j.neuropsychologia.2004.04.017
• Bunk, D., Eggers, C., Volberg, G., Schebaum-Stein, T. (2003) Dimensions of premorbid Disorders in Childhood-Onset Schizophrenia (COS). Neurology, Psychiatry and Brain Research, 10, 183-92.
• Eggers, C., Bunk, D., Volberg, G., & Röpcke, B. (1999). The ESSEN study of childhood-onset schizophrenia: Selected results. European Child & Adolescent Psychiatry, 8(Supp. 1), S21-S28. doi:10.1007/PL00010687

Conference contributions

Conference papers

• Volberg, G., & Hübner, R. (2002). Hemispheric asymmetries for global/local processing in varied mapping tasks. In R. P. Würtz & M. Lappe (Eds.), Dynamic Perception: Workshop of GI section 1.0.4 "Image Understanding" and the European Networks MUHCI and ECOVISION (pp. 95-100). Berlin, Germany: Akademische Verlagsgesellschaft AKA.

Talks

• Volberg, G., Wutz, A. & Greenlee, M. W. (2013, Mar). Neural mechanisms of top-down control in contour grouping. 55. Tagung experimentell arbeitender Psychologen (TeaP), Wien. Vortrag-PDF.
• Volberg, G, . Karmann, A., Birkner, S. & Greenlee, M. W. (2012, Apr). Short- and long-range neural synchrony in grapheme-color synesthesia.
  54. Tagung experimentell arbeitender Psychologen (TeaP), Mannheim, Germany.
• Volberg, G., Wutz, A., & Greenlee, M. W. (2009, Mar). Kortikale Dynamik der Konturintegration. 51. Tagung experimentell arbeitender Psychologen (TeaP), Jena, Germany.
• Kliegl, K., Volberg, G., & Greenlee, M. W. (2009, Mar). Reihenfolgeurteile während Sakkaden. 51. Tagung experimentell arbeitender Psychologen (TeaP), Jena, Germany.
• Volberg, G., Kliegl, K., Hansmayr, S. & Greenlee, M. W. (2008, Mar). EEG Alpha-Band-Oszillationen in der Vorbereitung auf hierarchische visuelle Reize. 50. Tagung experimentell arbeitender Psychologen (TeaP), Marburg, Germany.
• Volberg, G., & Hübner, R. (2004, Apr). Eine kombinierte EKP- und Reaktionszeitstudie zur Rolle von Antwortkonflikten für Hemisphärenunterschiede in der hierarchischen Reizverarbeitung. 46. Tagung experimentell arbeitender Psychologen (TeaP), Gießen, Germany.

Posters

• Volberg, G.; Hanslmayr, S.; Wimber, M.; Dalal, S. S.; Greenlee, G. W. (2013). The phase of pre-stimulus theta oscillations gates cortical information flow and predicts perception performance. Perception, 42 (Supp), 142.
  ECVP 2013, Bremen, Germany. (View Poster)
• Volberg, G.; Wutz, A.; Greenlee, G. (2012). Top-down control in contour grouping: an EEG study. Perception, 41 (Supp), 121. ECVP 2012, Alghero, Italien.
• Hanslmayr, S., Volberg, G., Wimber, M., Raabe, M., Greenlee, M. W., Bäuml, K.-H. T (2011). Single-trial correlations between brain oscillations and BOLD signal determine episodic memory formation. 11th International Conference on Cognitive Neuroscience, Mallorca, Spain.
• Volberg, G., Hanslmayr, S., Raabe, M., Karmann, A., Birkner, S., Bäuml, K.-H., Greenlee, M. (2010, Jun). How do we get aware of segmented stimuli? A combined EEG and fMRI study on contour integration. 16th Annual Meeting of the Organization for Human Brain Mapping (HBM), Barcelona, Spain.
• Hanslmayr, S., Volberg, G., Raabe, M., Birkner, S., Karmann, A., Wimber, M., Greenlee, M., Bäuml, K.-H. (2010, Jun). Simultaneous EEG-fMRI recordings reveal the two faces of voluntary forgetting. 16th Annual Meeting of the Organization for Human Brain Mapping (HBM), Barcelona, Spain.
• Kliegl, K. M., Volberg, G., & Greenlee, M. W. (2009, Aug). Temporal order judgments during saccades. 32nd European Conference on Visual Perception (ECVP), Regensburg, Germany. Published abstract in Perception, 38(Supplement), 175.
• Volberg, G., Wutz, A., & Greenlee, M. W. (2009, Aug). Contour awareness revealed in ERP error trials. 32nd European Conference on Visual Perception (ECVP), Regensburg, Germany. Published abstract in Perception, 38(Supplement), 115.
• Volberg, G., Kliegl, K., & Greenlee, M. W. (2007, Aug). Lateralized EEG alpha oscillations in the preparation for global and local processing. 30th European Conference on Visual Perception (ECVP), Arezzo, Italy. Published abstract in Perception, 36(Supplement), 104.
• Volberg, G., & Hübner, R. (2006, Mar). Funktionelle Hemisphärenunterschiede für die Verarbeitung von hierarchischen Reizen mit verteilter und selektiver Aufmerksamkeit. 48. Tagung experimentell arbeitender Psychologen (TeaP), Mainz, Germany.
• Volberg, G., & Hübner, R. (2005, Apr). Die Rolle von Antwortkonflikten und Aufgabenschwierigkeit für Hemisphärenunterschiede in der hierarchischen Reizverarbeitung. 47. Tagung experimentell arbeitender Psychologen (TeaP), Regensburg, Germany.
• Volberg, G., & Hübner, R. (2004, Jan). The role of response conflicts for hemispheric differences in global/local processing: A combined ERP and response time study. 7th Tübingen Perception Conference (TWK), Tübingen, Germany.
• Volberg, G., & Hübner, R. (2003, Mar). Funktionelle Gehirnasymmetrien für die Integration von Ebene und Form bei hierarchischen Reizen. 45. Tagung experimentell arbeitender Psychologen (TeaP), Kiel, Germany.
• Volberg, G., & Hübner, R. (2003, Feb). Cerebral Asymmetries for Global/local Processing Without Presenting Stimuli? Hemispheric Differences in Response to Pre-cues and Targets. 6th Tübingen Perception Conference (TWK), Tübingen, Germany.
• Volberg, G., & Hübner, R. (2002, March). Gibt es Hirnasymmetrien bei der Vorbereitung auf hierarchische Reize? 44. Tagung experimentell arbeitender Psychologen (TeaP), Chemnitz, Germany.
• Volberg, G., & Hübner, R. (2002, February). Functional hemispheric asymmetries for the integration of stimulus level and form. 5. Tübinger Wahrnehmungskonferenz (TWK), Tübingen, Germany.
• Oades, R. D., Volberg, G., Jemel, B., Achenbach, C., Röpcke, B., & Müller, B. (2001, July). Frontal sources of auditory working memory (MMN) and controlled attention (Nd): evidence for an impaired fronto-temporal lobe dialogue in schizophrenia. 7th World Congress of Biological Psychiatry, Berlin, Germany. Published abstract in The World Journal of Biological Psychiatry, 2(Supplement 1), 289S.
• Oades, R. D., Henning, U., Röpcke, B., Volberg, G., & Klimke, A. (2001, Jul). Associations of neuropsychological task performance with serum indices of monoamine activity in schizophrenia subgroups: noradrenaline and verbal recall. 7th World Congress of Biological Psychiatry, Berlin, Germany. Published abstract in The World Journal of Biological Psychiatry, 2(Supplement 1), 233S.