An optically stabilized fast-switching light emitting diode as a light source for functional neuroimaging
Methodology study published in PLoS ONE (2012)
Abstract
Neuroscience research increasingly relies on optical methods for evoking neuronal activity as well as for measuring it, making bright and stable light sources critical building blocks of modern experimental setups. This paper presents a method to control the brightness of a high-power light emitting diode (LED) light source to an unprecedented level of stability. By continuously monitoring the actual light output of the LED with a photodiode and feeding the result back to the LED's driver by way of a proportional-integral controller, drift was reduced to as little as 0.007% per hour over a 12-h period, and short-term fluctuations to 0.005% root-mean-square over 10 seconds. The LED can be switched on and off completely within 100 μs, a feature that is crucial when visual stimuli and light for optical recording need to be interleaved to obtain artifact-free recordings. The utility of the system is demonstrated by recording visual responses in the central nervous system of the medicinal leech Hirudo verbana using voltage-sensitive dyes.
Abstract sourced from PubMed (NCBI) for the cited record. See the original publication for the authoritative version.
Resumen
Stable LED light source for functional neuroimaging demonstrated by recording visual responses in medicinal leech Hirudo verbana CNS — methodology valuable for leech neurobiology research.
Por qué esto importa para la hirudoterapia
Este artículo presenta un método de ingeniería para estabilizar el brillo de LED de alta potencia utilizando retroalimentación por fotodiodo y control proporcional-integral, logrando una deriva de 0,007 % por hora durante 12 horas y una conmutación de 100 microsegundos, y demuestra el sistema registrando respuestas visuales en el sistema nervioso central de la sanguijuela medicinal Hirudo verbana mediante colorantes sensibles al voltaje. Para el dominio de ASH, la sanguijuela medicinal sirve únicamente como organismo modelo para demostrar la capacidad del sistema óptico en experimentos de neurociencia; el estudio trata fundamentalmente sobre ingeniería de fuentes de luz, no sobre hirudoterapia o biología de la sanguijuela. No existe una relevancia defendible para la aplicación terapéutica de sanguijuelas, el secretoma de la sanguijuela o el dominio de ASH.
Citación
An optically stabilized fast-switching light emitting diode as a light source for functional neuroimaging.
Wagenaar DA · PloS one, 2012
Contexto clínico relacionado
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Añadido a la biblioteca ASH: May 27, 2026 · Última actualización del sitio: 18 de junio de 2026