PMID: 11913813Mar 27, 2002Paper

Visual acuity thresholds of juvenile loggerhead sea turtles (Caretta caretta): an electrophysiological approach

Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
Soraya Moein BartolAlfred L Ochs

Abstract

Visual evoked potentials measure dynamic properties of the visual system by recording transient electric responses of neural tissue identified to correspond to a specific visual stimulus, such as light or a striped grid. In this study, visual evoked potentials were used to test the visual acuity of juvenile loggerhead sea turtles (Caretta caretta) in water. Subject animals were fitted with a Plexiglas goggle filled with filtered seawater. Stimuli of black and white striped gratings were presented to the turtles using a slide projector directing an image onto a screen via a rotatable mirror that shifted the striped pattern laterally one-half cycle. Bioelectric activity was collected using a digital averaging computer and subdermal platinum electrodes, implanted under the head scutes directly above the optic nerve and the contralateral optic tectum. To isolate the response signal from the noise, signal averaging techniques were used when collecting visual evoked potentials. The resulting response waveforms included a robust positive-negative compound that was used to track the turtle's response to visual stimulation. Acuity thresholds for these sea turtles, which were derived from linear regressions analysis of the positive-negat...Continue Reading

Citations

Dec 3, 2015·Journal of Integrative Neuroscience·Igor I Pushchin, Nataliya E Zyumchenko
Feb 28, 2008·Veterinary Ophthalmology·Denise K BrudenallKerstin A Fritsches
Jun 5, 2007·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Robert A BakerSheena Pullman
Mar 13, 2015·Proceedings. Biological Sciences·Kara L DodgeMolly E Lutcavage
Mar 10, 2011·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Shaun T D New, C Michael Bull
Mar 2, 2017·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Laura A RyanNathan S Hart

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