Cognitive and Computational Neuroscience at UCSC
Welcome to the Samaha Lab
Our lab uses psychophysics and computational modeling in concert with tools from cognitive neuroscience to measure and manipulate the human brain. We seek to understand the neural basis of visual consciousness, attention, perceptual decision making, metacognition, and working memory, and have a particular interest in the role of neural oscillations in these domains.
We are housed within the Department of Psychology at the University of California, Santa Cruz.
New Paper in eLife!
Iemi et al find that prestimulus neural oscillations have opposite effects on the early and late visual-evoked response. We found suppression of the C1 and N1 ERP component by prestimulus alpha- and beta-band power, as predicted by functional inhibition theories of low-frequency oscillations. Interestingly, however, the same prestimulus oscillations led to enhanced late (>200 ms) ERP components, which we can explain by a baseline shift mechanism (caused by modulation of oscillations with non-zero mean). We hope this paper adds to the discussion about the functional role of alpha/beta oscillations and the neural generators of ERPs!