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Critical flicker frequency (CFF) was investigated in a free swimming harp seal using behavioral techniques. The resulting CFF vs intensity curve indicates a definite rod/cone break, suggesting a duplex photoreceptor population, whose presence had not been observed in previous morphological reports.
Published in Vision Research 15:6 (June 1975), pp. 733–736. Copyright © 1975 Pergamon Press/Elsevier. Used by permission. http://www.sciencedirect.com/science/journal/00426989