Modulation minimizes masking

Article Abstract:

Nelken and colleagues have reported that the auditory system could have evolved to exploit natural sound properties, and that many such sounds are comodulated. They analyzed natural sounds including animal vocalizations, and decomposed each sound into a noise-like carrier signal, with an envelope to represent the amplitude modulation. They were then re-synthesized from the carrier and the envelope, and it was found that combinations of vocalizations and non-animal sounds were normally separable, while the calls of single animals could be non-separable

Neurobiology, Auditory perception

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Young receptors make smart mice

Article Abstract:

Long-term potentiation (LTP) is significantly boosted in transgenic mice with improved learning performance. This research has indicated a clear connection between manipulation of a specific gene and the physiological consequence, and is also significant for the variety of tasks studied, giving additional weight to the authors' conclusion that a more intelligent mouse has been produced. The research supports the view that LTP supplies the synaptic underpinning of memory.

Neuroplasticity

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