The Mechanism for Processing Random-Dot Motion at Various Speeds in Early Visual Cortices
文献类型：期刊论文
| 作者 | An, X ; Gong, HL ; McLoughlin, N ; Yang, YP ; Wang, W |
| 刊名 | PLOS ONE
 |
| 出版日期 | 2014 |
| 卷号 | 9期号:3页码:670-685 |
| 关键词 | CATS STRIATE CORTEX SPATIAL-FREQUENCY SELECTIVITY RECEPTIVE-FIELD ORGANIZATION COMPLEX CELLS FUNCTIONAL ARCHITECTURE DIRECTIONAL SELECTIVITY CONTRAST SENSITIVITY ORIENTATION MAPS APPARENT MOTION CEREBRAL-CORTEX |
| ISSN号 | 1932-6203 |
| 通讯作者 | Yang, YP (reprint author), Univ Sci & Technol China, CAS Key Lab Brain Funct & Dis, Sch Life Sci, Hefei 230026, Peoples R China.,yangyp@ustc.edu.cn |
| 英文摘要 | All moving objects generate sequential retinotopic activations representing a series of discrete locations in space and time (motion trajectory). How direction-selective neurons in mammalian early visual cortices process motion trajectory remains to be clarified. Using single-cell recording and optical imaging of intrinsic signals along with mathematical simulation, we studied response properties of cat visual areas 17 and 18 to random dots moving at various speeds. We found that, the motion trajectory at low speed was encoded primarily as a direction signal by groups of neurons preferring that motion direction. Above certain transition speeds, the motion trajectory is perceived as a spatial orientation representing the motion axis of the moving dots. In both areas studied, above these speeds, other groups of direction-selective neurons with perpendicular direction preferences were activated to encode the motion trajectory as motion-axis information. This applied to both simple and complex neurons. The average transition speed for switching between encoding motion direction and axis was about 31 degrees/s in area 18 and 15 degrees/s in area 17. A spatio-temporal energy model predicted the transition speeds accurately in both areas, but not the direction-selective indexes to random-dot stimuli in area 18. In addition, above transition speeds, the change of direction preferences of population responses recorded by optical imaging can be revealed using vector maximum but not vector summation method. Together, this combined processing of motion direction and axis by neurons with orthogonal direction preferences associated with speed may serve as a common principle of early visual motion processing. |
| 学科主题 | Multidisciplinary Sciences |
| 收录类别 | SCI |
| 资助信息 | National '973' Program [2011CBA00400, 2009CB941303]; Fundamental Research Funds for the Central Universities [WK2070000007] |
| 语种 | 英语 |
| 公开日期 | 2014-07-30 |
| 源URL | [http://ir.sibs.ac.cn/handle/331001/2616]  |
| 专题 | 上海神经科学研究所_神经所(总) |
| 推荐引用方式 GB/T 7714 | An, X,Gong, HL,McLoughlin, N,et al. The Mechanism for Processing Random-Dot Motion at Various Speeds in Early Visual Cortices[J]. PLOS ONE,2014,9(3):670-685. |
| APA | An, X,Gong, HL,McLoughlin, N,Yang, YP,&Wang, W.(2014).The Mechanism for Processing Random-Dot Motion at Various Speeds in Early Visual Cortices.PLOS ONE,9(3),670-685. |
| MLA | An, X,et al."The Mechanism for Processing Random-Dot Motion at Various Speeds in Early Visual Cortices".PLOS ONE 9.3(2014):670-685. |
入库方式： OAI收割
来源：上海神经科学研究所
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