Frequency transfer properties of three distinct types of cat horizontal cells

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Abstract
Intracellular responses of horizontal cells in the retina were recorded from the intact eye in situ of anesthetized and paralyzed cats. The responses to large (15×15 °) high modulation (0.6–0.9) photopic (140–200 cd/m2) sinewave light stimuli could be grouped unequivocally into three distinct classes on the basis of the critical flicker frequency (CFF); Hn-units had a CFF of 25–40 Hz, Hm-units of 55–70 Hz and Hw-units of 95–110 Hz. For some stimulus situations small oscillations could be seen in Hm-responses (resonance frequency of about 43 Hz) and Hw-responses (resonance frequency 95 Hz). Hn-responses never showed such an oscillatory tendency. Frequency transfer functions are presented for the three types of H-units and a phenomenological model is discussed that describes these results quantitatively.