Abstract
It is currently assumed that steady-state pattern electroretinograms can be obtained only at high rates of pattern reversal. However, steady-state responses can also be obtained at very low temporal frequencies (less than 1 Hz), provided that the reversal is sinusoidal. In five healthy volunteers, we studied the frequency characteristics of the pattern-reversal electroretinogram in response to sinusoidal gratings of 0.4 and 4 c/deg, reversed sinusoidally in contrast at frequencies ranging from 1 to 27 Hz. Steady-state responses dominated by the second harmonic component were obtained at all temporal frequencies tested; the amplitude of the second harmonic changed with stimulus temporal frequency. In the low-temporal-frequency range, stimuli of high spatial frequency appear to elicit larger contribution of generators with sustained or tonic characteristics compared with stimuli of low spatial frequency.
Original language | English (US) |
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Pages (from-to) | 169-176 |
Number of pages | 8 |
Journal | Documenta Ophthalmologica |
Volume | 90 |
Issue number | 2 |
DOIs | |
State | Published - Feb 1995 |
Externally published | Yes |
Keywords
- Magnocellular system
- Parvocellular system
- Pattern Electroretinogram
- Spatial frequency
- Steady-state responses
- Temporal frequency
ASJC Scopus subject areas
- Ophthalmology