Abstract:
:The contrast transfer function (CTF) of the pattern electroretinogram (PERG) depends on temporal frequency. For transient stimulation it is fully linear; at faster stimulation rates it becomes strongly non-linear with an accelerated shape. In this study we investigated a range of stimulus parameters with the aim of studying the influence of temporal and spatial frequencies, as well as contrast levels, on the CTF; effects were quantified via an "index of linearity" IL. Both reversal rate and check size influenced linearity (p<.001), examples: At a constant check size of 0.8 degrees, 7.7 rps: IL=1.0; 0.8 degrees/24 rps: IL=0.5; at a constant reversal rate of 19 rps, IL was 0.5 for 0.8 degrees, but rose to 0.8 both for 0.2 degrees and 18 degrees. The reason for this complex response surface remains a puzzle, it cannot be explained by varying parvo/magnocellular contributions, and its possible influences on recordings in patients merit further studies.
journal_name
Vision Resjournal_title
Vision researchauthors
Ben-Shlomo G,Bach M,Ofri Rdoi
10.1016/j.visres.2007.04.009subject
Has Abstractpub_date
2007-07-01 00:00:00pages
1992-9issue
15eissn
0042-6989issn
1878-5646pii
S0042-6989(07)00190-3journal_volume
47pub_type
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