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Flicker fusion frequency of the electroretinogram is reduced by Diplostomum baeri infection. A. Responses to stimulation at 10 Hz, 20 Hz and 40 Hz in an uninfected yellow perch (Perca flavescens). Flicker fusion is reached at 40 Hz. B. Responses to stimulation at 5 Hz and 10 Hz in an infected perch. Flicker fusion is reached at 10 Hz. Time base = 0.27 s/div, amplitude = 15.5 mV/div.
