Faculty

sridhar

Sridharan Devarajan

Assistant Professor & Wellcome Trust DBT Intermediate Fellow

Phone : +91 80 2293 3434
E-Mail : coglabcns.iisc[at]gmail.com
web : www.cns.iisc.ac.in/sridhar/

Research Areas

Cognition, Computation and Behaviour


Research Details

sridharan-1How does our brain enable us to pay attention selectively to some things, and to ignore others? What happens in the brain when we make important decisions? Our research focuses on understanding the neural basis of cognitive phenomena such as selective attention and decision making.

To address these questions we follow a quantitative approach that combines neuroscience experiments, model-based analyses (e.g., linear/nonlinear dynamical systems, control theory, machine learning) as well as large-scale computer simulations.

To develop and refine our hypotheses we directly measure or perturb brain activity in human subjects performing cognitively demanding tasks. We employ a variety of cutting-edge techniques, including functional neuroimaging (fMRI), diffusion imaging (dMRI), high-density electroencephalography (EEG), and transcranial electrical and magnetic stimulation (tES/tMS).

The overarching goal is to develop a unified framework that describes how cognitive phenomena emerge from neural computations by a systematic analysis of neurons and behavior. We are looking for students interested in understanding from diverse backgrounds (biology, computing, engineering, physics) to join us. For a flavor of some of our work (past and ongoing), do feel free to look around

Publications

Sridharan D, Steinmetz NA, Moore T, Knudsen EI., (2017), Does the superior colliculus control perceptual sensitivity or choice bias during attention? Evidence from a multialternative decision framework, Journal of Neuroscience, 37 (3) , 480-511

Knudsen EI, Schwarz JS, Knudsen PF, Sridharan D, (2017), Space-Specific Deficits in Visual Orientation Discrimination Caused by Lesions in the Midbrain Stimulus Selection Network, Curr Biol. , 2053-2064.e5

Sundaresan M, Nabeel A, Sridharan D, (2017), Mapping distinct timescales of functional interactions among brain networks, Advances in Neural Information Processing Systems

Sridharan D, Knudsen EI., (2015), Gamma oscillations in the midbrain spatial attention network: linking circuits to function, Curr Opin Neurobiol, 31:189-98

Sridharan D, Knudsen EI., (2015), Selective disinhibition: A unified neural mechanism for predictive and post hoc attentional selection, Vision Res, 116(Pt B), 194-209

Sridharan D, Steinmetz NA, Moore T, Knudsen EI., (2014), Distinguishing bias from sensitivity effects in multialternative detection tasks, Journal of Vision , 14(9):16, 1-32

Sridharan D, Schwarz JS, Knudsen EI., (2014), Selective attention in birds, Current Biology, 24(11): R510-513

Sridharan D, Ramamurthy DL, Schwarz JS, Knudsen EI., (2014), Visuospatial selective attention in chickens, Proceedings of the National Academy of Sciences, 111(19): E2056-2065

Schwarz JS, Sridharan D, Knudsen EI., (2013), Magnetic tracking of eye position in freely behaving chickens, Frontiers in Systems Neuroscience , 7(91):1-8

Sridharan D, Ramamurthy DL, Knudsen EI., (2013), Spatial probability dynamically modulates visual target detection in chickens, Plos One, 8(5): e64136

Goddard CA, Sridharan D, Huguenard JR, Knudsen EI, (2012), Gamma oscillations are generated locally in an attention-related midbrain network, Neuron., 73(3):567-80

Sridharan D, Boahen K, Knudsen EI, (2011), Space coding by gamma oscillations in the barn owl optic tectum, Journal of Neurophysiology, 105(5):2005-17