Abstract
Orientation selectivity is an emergent property of neurons in the primary visual cortex (V1). Orientation selectivity based on spike counts was quantified by bandwidth and circular variance (CV) of the orientation tuning curve. In this study, we studied bandwidth of the orientation tuning curve in cat V1 and its relationship to some physiological parameters. We used drifting sinusoidal grating to test the size of the length and width tunings for single neuron. We observed that simple cells have more elongated excitatory receptive field, while the complex cells have more squarer excitatory receptive field. Furthermore, we found that there was a stronger correlation between tuning width and aspect ratio than CV and aspect ratio. But there are notable differences in orientation selectivity between simple and complex cells. These findings suggest that the aspect ratio of the receptive field is a major factor that affects bandwidth.
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Acknowledgments
We thank Dr. D.A. Tigwell for comments on the manuscript and X.Z. Xu for technical assistance. We also thank Dr. Y.C. Cai for the help with the stimulus and analysis programs. The authors declare no competing financial interests.
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Xu, T., Li, M., Chen, K., Wang, L., Yan, HM. (2016). Aspect Ratio of the Receptive Field Makes a Major Contribution to the Bandwidth of Orientation Selectivity in Cat V1. In: Wang, R., Pan, X. (eds) Advances in Cognitive Neurodynamics (V). Advances in Cognitive Neurodynamics. Springer, Singapore. https://doi.org/10.1007/978-981-10-0207-6_20
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DOI: https://doi.org/10.1007/978-981-10-0207-6_20
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