Visual System I: Phototransduction in humans and locusts

The translation of a stimulus into a signal which can be processed by the nervous system is a key process in the perception of the enveronment. In this course several aspects of the signal transduction in photoreceptors will be investigated with electrophysiological methods.  The participants investigate the speed of stimulus processing in the human eye. Therefore they measure the flickerfusion frequency at different light intensities in a self-experiment. The results will be discussed with respect to physiological properties of rods and cones.
The electrical activity will be measured by extracellularly recording the summed potential of photoreceptors  (electroretinogram, ERG). By using these recordings the flickerfusion frequency will be determined at different light intensities. A stimulus-intensity response curve will be measured by applying light flashes of different intensities while recording the ERG. Additionally the spectral sensitivity of the locust eye will be studied.
All results will be discussed after the experiment.

The course may be combined with the course Öffnet internen Link im gleichen FensterVisual system II: Motion detection in locusts and humans

Duration: 1 - 1.5 days
Number of participants:
max 16

Öffnet internen Link im gleichen FensterApplication