Contact

Hamed Bahmani

Address: Spemannstr. 38
72076 Tübingen
Room number: 232
Phone: +49 7071 601 1673
Fax: +49 7071 601 652
E-Mail: hamed.bahmani

 

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Hamed Bahmani

Position: VW Project Leader  Unit: Logothetis

Hamed's research interests include physiology of cognitive processes, in particular the neural correlates of higher visual functions like visual perception, memory and attention.

Neural correlates of perceptual transitions during binocular flash suppression

Imaging studies have shown involvement of a distributed network of brain areas including primary visual cortex (V1) and frontoparietal cortical network in perceptual alternations during bistable and multistable phenomena. However, the role of parietal cortex in perceptual transitions has not yet been investigated at the level of single neurons. In addition, the role of area V1 in perceptual organization is still a subject of intense debate. In three independent but yet coherent projects, we explored the role of parietal visual areas in perceptual transitions during binocular flash suppression (BFS). We also tested the hypothesis that synchronized activity in V1 carries perceptual information. Furthermore, we compared the extent to which neurons in V1 modulate by perception under anesthetized conditions and compared with awake, passively fixating animals. Our work confirms that a distributed network of cortical regions is responsible for the resolution of perceptual rivalry during bistable conditions. This includes areas as early as primary visual cortex and higher processing stages such as lateral intraparietal area (LIP). However, the strength of these modulations may depend on the level of engagement of subjects in an active task. We demonstrated that modulation of neural activity in the firing rates during passive fixation is essentially comparable to the anesthetized condition in V1. In addition, we provided evidence that modulation of firing rate is not the only neural correlate of perception and showed that neural synchronization in V1 can reflect perceptual state even in the absence of significant firing rate modulations. Orchestration of coherent activity observed in V1 can be triggered by the fast feedback signals from higher visual areas like LIP.

 

Uploading data to the brain

What if you can upload a language package to your brain in a few seconds or teach a person how to play tennis by a single click? There exists a growing body of literature on how to read the brain or 'decode' neural information. However, writing to the brain or 'encoding' information in neuronal networks has been left sterile. In this project, experiments in rodents are proposed to upload a navigation map to a rat's brain, or transfer post-learning knowledge of a particular behavioral task from one animal to another by using multi-electrode extracellular recording and neuronal microstimulation in real-time. If successful, 'The Matrix' will no longer be a sci-fi movie.
The ‘Experiment!’ funding initiative by the Volkswagen Foundation addresses researchers in science and engineering as well as in the life sciences including behavioral biology and experimental psychology, who want to put a potentially transformative research idea to the test. They are given the opportunity to demonstrate preliminary evidence for a concept’s potential during an exploratory phase. In the fourth call of this initiative, 18 out of a total of 544 project proposals were approved, including the exciting project of Hamed Bahmani from the Max Planck Institute for Biological Cybernetics, Tübingen, for which € 87,000 will be provided.

https://tuebingen.mpg.de/en/detail/uploading-data-to-the-brain/

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Articles (2):

Bahmani H and Wahl S (November-2016) Distorted Low-Level Visual Features Affect Saliency-Based Visual Attention Frontiers in Computational Neuroscience 10(124) 1-4.
Bahmani H, Murayama Y, Logothetis NK and Keliris GA (September-2014) Binocular Flash Suppression in the Primary Visual Cortex of Anesthetized and Awake Macaques PLoS ONE 9(9) 1-8.

Posters (7):

Bahmani H, Lakshminarasimhan KJ, Logothetis NK and Keliris GA (July-8-2015): Spike-Field Coherence Reflects Perceptual State in Monkey Primary Visual Cortex, 9th IBRO World Congress on Neuroscience (IBRO 2015), Rio de Janeiro, Brazil.
Bahmani H, Murayama Y, Logothetis NK and Keliris GA (October-2014): Binocular Flash Suppression in the Primary Visual Cortex of Anesthetized and Awake Macaques, 15th Conference of Junior Neuroscientists of Tübingen (NeNa 2014): The Changing Face of Publishing and Scientific Evaluation, Schramberg, Germany.
Bahmani H, Logothetis NK and Keliris GA (September-2013): Effects of binocular flash suppression in awake and anesthetized macaque, Bernstein Conference 2013, Tübingen, Germany.
Bahmani H, Logothetis NK and Keliris GA (August-2013): Effects of binocular flash suppression in the anesthetized macaque, 36th European Conference on Visual Perception (ECVP 2013), Bremen, Germany, Perception, 42(ECVP Abstract Supplement) 145.
Bahmani H, Logothetis NK and Keliris GA (August-2012): The role of parietal visual cortex in perceptual transitions during bistable perception, 12th Annual Meeting of the Vision Sciences Society (VSS 2012), Naples, FL, USA, Journal of Vision, 12(9) 683.
Bahmani H, Logothetis NK and Keliris GA (October-2011): Neural correlates of binocular rivalry in parietal cortex, Computational Neuroscience & Neurotechnology Bernstein Conference & Neurex Annual Meeting 2011, Freiburg, Germany, Frontiers in Computational Neuroscience, 5(Conference Abstract: BC11) 123-125.
Bahmani H, Logothetis NK and Keliris GA (October-2011): Neural Correlates of Binocular Rivalry in Parietal Cortex, 12th Conference of Junior Neuroscientists of Tübingen (NeNA 2011), Heiligkreuztal, Germany.

Talks (1):

Bahmani H and Wahl S (November-24-2015) Abstract Talk: Effects of attention on accommodative response, 16th Conference of Junior Neuroscientists of Tübingen (NeNa 2015): Communicating the Challenges of Science, Schramberg, Germany 15.
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Last updated: Monday, 22.05.2017