THE c‐WAVE OF THE HUMAN D.C. REGISTERED ERG. I. A QUANTITATIVE STUDY OF THE RELATIONSHIP BETWEEN c‐WAVE AMPLITUDE AND STIMULUS INTENSITY

Abstract

The c ‐wave of the human ERG was studied with a new method, using d.c. amplification and averaging technique. Stable and reproducible recordings of the c ‐wave were obtained without the aid of general anaesthesia. Within the investigated range of intensities (2 log units) a linear relationship between c ‐wave amplitude and log stimulus intensity was found. This was valid whether the c ‐wave was measured from the base‐line or from the bottom of the preceding trough. The value of standardizing this method for routine clinical purposes is discussed.