2009年11月
Spatial-frequency tuning in the pooling of one- and two-dimensional motion signals
VISION RESEARCH
- ,
- ,
- ,
- 巻
- 49
- 号
- 23
- 開始ページ
- 2862
- 終了ページ
- 2869
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.visres.2009.08.026
- 出版者・発行元
- PERGAMON-ELSEVIER SCIENCE LTD
Cortical neurons that initially extract motion signals have small receptive-fields, and narrow orientation- and band pass-spatial-frequency tuning. Accurate extraction of the veridical motion of objects typically requires the global pooling of the output of multiple local-motion units across orientation and space. We examined whether the narrow spatial-frequency tuning present at the local-motion level is preserved at the global-motion-pooling stage. Stimuli consisted of numerous drifting Gabor or plaid elements that were either signal (carrier drift-speed consistent with a given global-motion vector) or noise (drift speed consistent with a random, noise vector). The carrier spatial-frequencies of the signal and noise elements were independently varied. Regardless of the frequency of the signal elements, broad low-pass masking functions were obtained for both Gabor (one-dimensional) and Plaid (two-dimensional) conditions when measuring the threshold signal ratio for identification of the global-motion direction. For the Gabor stimuli, this pattern of results was also independent of the relative orientations of the signal and noise elements. These results indicate that in the global-motion pooling of one-dimensional and two-dimensional signals, local-motion signals of all spatial frequencies are pooled into a single system that exhibits broadband, low-pass tuning. (C) 2009 Elsevier Ltd. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1016/j.visres.2009.08.026
- ISSN : 0042-6989
- PubMed ID : 19732787
- Web of Science ID : WOS:000272134000014