(a) Hinton diagram of 5 connection matrix for one inhibitory and four excitatory neurons. The white and black represent the positive and negative value, respectively. The size of the square is proportional to the absolute value of the connection weights. The eigenspectrum of consists of one real and two pairs of complex conjugate eigenvalues . Weight perturbation by slightly enhancing the local E-E connectivity while keeping I-E connection unchanged leads to a new eigenspectrum . (b) Two growing or decaying modes of harmonic oscillators emerge from the superposition of real and complex eigenmodes. The eigenmode in blue oscillates faster after synaptic plasticity. (c) Activation of two readout neurons (in red and blue) after ReLU transformation. After synaptic weight perturbation, the red-blue neuron sequence activation shifts earlier.
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