Photograph of Oscillatory Electric Spark

Drawing a spark from darkness: John Walsh and electric fish.

John Walsh's research on electric fish, carried out between 1772 and 1775, proved fundamental for demonstrating that electricity might be involved in animal physiology, and, moreover, in favouring a period of great progress in both the physiology and physics of electrical phenomena. However, Walsh is hardly known to modern neuroscientists and is largely neglected by science historians also. One...

A Musical Photograph?

Peripheral sensory coding through oscillatory synchrony in weakly electric fish

Adaptations to an organism's environment often involve sensory system modifications. In this study, we address how evolutionary divergence in sensory perception relates to the physiological coding of stimuli. Mormyrid fishes that can detect subtle variations in electric communication signals encode signal waveform into spike-timing differences between sensory receptors. In contrast, the recepto...

Building Archaeological Photograph Library

The photographs taken at excavation fields are one of most important materials. It is expected to digitize and save these photographs in the computer system because of difficulty of management to many photographs and losing color problem. We designed and implemented prototype of archaeological photograph library. The library is designed based on Dublin Core Metadata Element set and XML We descr...

Automatic Photograph Enhancement

We propose a method of image enhancement, based on a spatial domain technique called histogram equalization. Traditional histogram equalization is only useful for images with backgrounds and foregrounds that are both bright or both dark, whereas our method works for images with high dynamic range. The technique is to segment the image into large regions with high contrast separations which are ...