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Neural correlations code for stimulus variance

BMC Neuroscience
Springer (Biomed Central Ltd.)
Publication Date
DOI: 10.1186/1471-2202-14-s1-p61
  • Poster Presentation
  • Mathematics
  • Philosophy
  • Physics


Neural correlations code for stimulus variance POSTER PRESENTATION Open Access Neural correlations code for stimulus variance Michael G Metzen, Mohsen Jamali, Jerome Carriot, Oscar Avila-Akerberg, Kathleen E Cullen, Maurice J Chacron* From Twenty Second Annual Computational Neuroscience Meeting: CNS*2013 Paris, France. 13-18 July 2013 Natural sensory stimuli are characterized by time varying moments such as mean (first-order) and variance (second-order). While psychophysical studies have shown that second order attributes are critical for perception, how they are encoded in the brain remains largely unknown. Here we focused on second-order feature cod- ing by correlated activity. We recorded from two example sensory systems that share many similarities: the primate vestibular system and the fish electrosensory system. Peripheral sensory neurons in both systems respond to amplitude modulated noise stimuli (Figure. 1A.1, B.1). We found that the correlation coefficient between spike trains coded second order attributes (i.e. envelope, Figures. 1A.2, B.2) whereas single neuron firing rate coded first order attributes (Figure. 1A.3, B.3). We built a simple phenomenological mathematical model based on the leaky integrate-and-fire formalism that reproduced our experimental data (Figure. 1C.1, C.2) and predicted that optimal coding of second-order stimulus features by correlation is achieved for non-zero values of baseline variability as quantified by the coefficient of variation (CV) (Figure. 1C.3). We tested this prediction by plotting our data as a function of CV and found that our model could explain variations on both vestibular and electro- sensory data (Figure. 1D). Our results show that corre- lated activity codes for stimulus attributes that are distinct from those coded by firing rate and provide a novel role for neural variability. Such codes are predicted to be a general feature of sensory processing. Published: 8 July 2013 doi:10.1186/1471-2202-14-S1-P61 Cite this articl

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