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Background for Neuroscience

  • Neuron

Action potenitals: spiking or firing

image-20200322163123664

  • Anatomy

image-20200322163256644

  • Recordings

  • invasive(most accurate): it could be single unit or multi-unit

ECoG: very rare

  • neuroimaging: MEG/EEG/fMRI(good spatial resolution but bad time accuracy)

Why it works: nice properties that neurons in the same orientation

  • Visual system

image-20200322164400363

  • Ventral Stream: what is the object
  • Dorsal Stream: where is the object

feed-forward, feed-back connection

image-20200322164604869

真正的神经网络可能也是层级的, 一层处理某一项功能, 比如浅层的来识别物体种类, 深层的识别物体位置.

如果要通过计算机实现上述的模型, 会用到一个分层的前馈模型

  • CNN

  • 简单的cell: 映射

  • 复杂的cell: 类似于卷积

Max Pooling: 池化作用于图像中不重合的区域, 所以pooling之后会变小