Spontaneous emergence of fast attractor dynamics in a model of developing primary visual cortex
Spontaneous emergence of fast attractor dynamics in a model of developing primary visual cortex
复制标题
初级视觉皮层发育模型中快速吸引子动力学的自发出现
作者：
Thomas Miconi;J. McKinstry;G. Edelman
最近的证据表明，初级感觉皮层中的神经元排列成竞争性的组，通过它们的联合活动来表示刺激，而不是作为独立的特征分析器。这些结果的一个可能的解释是，感觉皮层执行吸引动力学，虽然这个建议仍然存在争议。在这里，我们报告说，快速吸引动力学自然出现在一个计算模型的补丁的初级视觉皮层赋予现实的可塑性（在前馈和侧突触）和相互抑制。当暴露于自然图像（但不是随机像素）时，该模型自发地排列成相互连接的竞争性组，类似地调整神经元，同时开发出逼真的，方向选择性的感受野。重要的是，在刺激诱发和自发（无刺激）活动中观察到相同的组。由此产生的网络是抑制稳定的，并表现出快速，非持久的吸引子动力学。我们的研究结果表明，现实的可塑性，相互抑制和自然的刺激是共同必要的，足以产生吸引动力学在初级感觉皮层。感觉皮层通过竞争神经元集合的联合活动来表示刺激。在这里，作者表明，一个具有可塑性前馈和递归突触的视觉皮层模型，暴露于自然图像，自发地在相似调谐的神经元组之间产生吸引子动力学。
Recent evidence suggests that neurons in primary sensory cortex arrange into competitive groups, representing stimuli by their joint activity rather than as independent feature analysers. A possible explanation for these results is that sensory cortex implements attractor dynamics, although this proposal remains controversial. Here we report that fast attractor dynamics emerge naturally in a computational model of a patch of primary visual cortex endowed with realistic plasticity (at both feedforward and lateral synapses) and mutual inhibition. When exposed to natural images (but not random pixels), the model spontaneously arranges into competitive groups of reciprocally connected, similarly tuned neurons, while developing realistic, orientation-selective receptive fields. Importantly, the same groups are observed in both stimulus-evoked and spontaneous (stimulus-absent) activity. The resulting network is inhibition-stabilized and exhibits fast, non-persistent attractor dynamics. Our results suggest that realistic plasticity, mutual inhibition and natural stimuli are jointly necessary and sufficient to generate attractor dynamics in primary sensory cortex. Sensory cortices represent stimuli through joint activity of competing neuronal assemblies. Here the authors show that a model of visual cortex with plastic feedforward and recurrent synapses, exposed to natural images, spontaneously develops attractor dynamics between groups of similarly tuned neurons.
DOI：
10.1364/josaa.4.002379
发表时间：
1987-12-01
影响因子：
1.9
作者：
FIELD, DJ
通讯作者：
FIELD, DJ