Electroretinography with Weak Stimuli

Electroretinography with noncorneal and corneal electrodes.

The noncorneal ERG is essential for certain patients in which corneal recording is contraindicated. A preliminary report is presented investigating ERGs from three noncorneal montages and their correlation with the corneal ERG. Statistical analysis showed that an electrode at the medial canthus combined with medial viewing gave the closest correlation to the corneal ERG. Repeatability was good ...

Non-invasive electroretinography.

Electroretinographic (ERG) investigations are conventionally performed by using corneal or conjunctival recording electrodes. Both types have to be placed in contact with the eye, resulting invasive and providing discomfort for the patient. This paper presents a simple technique to detect ERG potentials non-invasively. It relies on the use of a conducting liquid between the eye and an external ...

Electroretinography in Veterinary Ophthalmology

Somatosensory pain is not reliably modulated by weak acoustic stimuli.

BACKGROUND Pain induced by electrical stimuli has been found in previous research to be reduced by brief, weak electrical pulses, termed prepulses, presented 40 to 60ms prior to the painful electrical stimulus. METHODS The present experiment investigated the generality of this effect by presenting weak acoustic stimuli simultaneously with, or 80 or 1000ms prior to, painful electric shocks. In...

Attention and the detectability of weak taste stimuli.

Subjects detected weak solutions of sucrose or citric acid under conditions in which attention was directed toward one of the tastants or the other. Detection thresholds were measured using an adaptive, forced-choice procedure, with a three-down one-up rule, which computer simulations suggest should be more reliable than the popular two-down one-up rule. The thresholds were modestly but systema...