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Sparse Spectro-Temporal Receptive Fields Based on Multi-Unit and High-Gamma Responses in Human Auditory Cortex

Fig 4

Discovery-based selection of lambda (λ).

Discovery-selection by permutation of the response r(t) to identify the minimum lambda necessary to reduce the degrees of freedom to zero. Empirical distribution shows the histogram of minimum λ over 200 repeated permutations and serves as the null distribution. The red arrow denotes the median of the distribution that we designate as the optimal λ.

Fig 4

doi: https://doi.org/10.1371/journal.pone.0137915.g004