Cerebral Cortex Advance Access originally published online on February 8, 2006
Cerebral Cortex 2007 17(1):71-80; doi:10.1093/cercor/bhj125
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Multiparametric Changes in the Receptive Field of Cortical Auditory Neurons Induced by Thalamic Activation in the Mouse
Department of Physiology and Biophysics, Faculty of Medicine, Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta T2N 4N1, Canada
Address correspondence to Dr Jun Yan, Department of Physiology and Biophysics, Faculty of Medicine, University of Calgary, Hotchkiss Brain Institute, 3330 Hospital Drive, NW, Rm193B, Calgary, Alberta T2N 4N1, Canada. Email: juyan{at}ucalgary.ca.
The functional organization of the sensory cortex is constructed to process sensory information based on experience and learning. Importantly, it is plastic so that it can quickly adapt to environmental changes. Because the thalamus gates all ascending information, it is critical to understand how the thalamocortical system contributes to the plasticity of the sensory cortex. We show here that the neuronal receptive field (RF) in the auditory cortex faithfully tends toward the RF of the electrically stimulated auditory thalamic neurons. We characterized the RF of auditory neurons by measuring the best frequency, minimum threshold, bandwidth, RF area, and averaged response magnitude. All these parameters of the cortical RF showed robust changes toward the values of the parameters of the stimulated thalamic neuron following focal thalamic stimulation. Our data suggest that the thalamocortical system possesses intrinsic mechanisms that underlie the input specificity of learning-induced or experience-dependent cortical plasticity.
Key Words: auditory cortex • auditory plasticity • auditory thalamus • mouse • receptive field
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