Efficient auditory coding

Article Abstract:

The complete acoustic waveforms for natural sounds can be represented efficiently with a nonlinear model based on a population spike code. When the features are optimized for coding natural sounds or speech, they show striking similarities to time-domain cochlear filter estimates, have a frequency-bandwidth dependence similar to that of auditory nerve fibres and give greater coding efficiency than conventional signal representations.

Sound-waves, Sound waves, Nature sounds, Acoustic nerve

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Neural coding by correlation

Article Abstract:

The constraints imposed by interval correlations are likely to reduce the transmission of information. However correlations of intervals between signal pulses are capable of reducing low-frequency noise and thus increase the transfer of information.

Influence, Noise, Noise (Sound), Neural conduction

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Migratory neural crest-like cells form body pigmentation in a urochordate embryo

Article Abstract:

A description on a migratory cell population resembling neural crest cells in the ascidian urochordate Ecteinascidia turbinata is presented. The study concludes that migratory neural crest-like cells are present in the ascidian Ecteinascidia.

Ascidiacea, Sea squirts, Tunicata, Tunicates

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