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Parallel coding of first and second order stimulus attributes
BMC Neuroscience volume 13, Article number: O13 (2012)
Natural stimuli often have time varying first (i.e. mean) and second order (i.e. variance) attributes that each carry critical information for perception and can vary independently over orders of magnitude. We recorded the responses of midbrain electrosensory neurons in the weakly electric fish Apteronotus leptorhynchus to stimuli with first and second order attributes that varied independently in time. We found two distinct groups of midbrain neurons: the first group responded to both first and second order attributes while the other responded selectively to second order attributes. Using computational analyses, we show how inputs from a heterogeneous population of ON- and OFF-type afferent neurons are combined in order to give rise to response selectivity to second order stimulus attributes in midbrain neurons. Our study thus uncovers, for the first time, generic and widely applicable mechanisms by which selectivity to second order stimulus attributes emerges in the brain.
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Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution License ( https://creativecommons.org/licenses/by/2.0 ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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McGillivray, P., Vonderschen, K., Fortune, E.S. et al. Parallel coding of first and second order stimulus attributes. BMC Neurosci 13 (Suppl 1), O13 (2012). https://doi.org/10.1186/1471-2202-13-S1-O13
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DOI: https://doi.org/10.1186/1471-2202-13-S1-O13
Keywords
- Animal Model
- Critical Information
- Afferent Neuron
- Distinct Group
- Computational Analysis