A multi-chip implementation of cortical orientation hypercolumns
A multi-chip implementation of cortical orientation hypercolumns
复制标题
皮质定向超柱的多芯片实现
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
K. Boahen
中科院分区：
文献类型：
--
作者：
Thomas Y. W. Choi;Bertram E. Shi;K. Boahen
本文描述了在哺乳动物初级视觉皮层中发现的定向超柱的神经形态实现。超柱包含一组神经元，它们对相同的视网膜位置有反应，但有不同的取向偏好。该系统由一个硅视网膜组成，它为多个方向选择芯片提供营养，每个芯片都包含指向相同方向的神经元，但具有不同的感受野中心和空间相位。所有芯片在连续时间内工作，并使用异步数字地址事件表示通信协议传输的尖峰相互通信。这使我们能够实现一个超柱内神经元之间的循环相互作用，即使它们位于不同的芯片上。我们通过测量由于反馈变化而引起的取向选择性的变化来证明这一点。
This paper describes a neuromorphic implementation of the orientation hypercolumns found in the mammalian primary visual cortex. A hypercolumn contains a group of neurons that respond to the same retinal location, but with different orientation preferences. The system consists of a single silicon retina feeding multiple orientation selective chips, each of which contains neurons tuned to the same orientation, but with different receptive field centers and spatial phases. All chips operate in continuous time, and communicate with each other using spikes transmitted by the asynchronous digital address event representation communication protocol. This enables us to implement recurrent interactions between neurons within one hypercolumn, even though they are located on different chips. We demonstrate this by measuring shifts in orientation selectivity due to changes in the feedback.