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A quantitative analysis of the spatial summation of excitation within the receptive field centers of retinal neurons

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Summary

In light-adapted cats action potentials of single optic tract fibers were recorded. Four light-stimuli of 0.09 degree diameter and 0.18 degree distance were projected to the receptive field center (sinusoidal stimulation 0.5 to 25 cps, degrce of modulation>0.9, maximal luminance 54 to 122 asb). The position of the 4 spot stimulus pattern was adjusted within the RF-center, as each light-spot elicited approximately the same neuronal activation.

The spatial summation of the response of on-center and off-center neurons to one, two, three and four-spot illumination does not support a hypothesis of linear spatial summation and lateral interaction within the receptive field. The summing properties of on-center neurons in the RF-center are best described bymodels with multiplicative, lateral forward inhibition within the receptive field center [eq. (5–7)].

The inhibition coefficientk i in these equations was dependent on the stimulus frequency. It decreased with stimulus frequencies between 3 and 10 cps and increased above 10 cps. The experimental results indicate that the non-linear spatial summation of excitation within the RF-center is dependent on the temporal properties of the stimulus pattern.

Zusammenfassung

die Aktionspotentiale einzelner Fasern des Tractus opticus der Katze wurden stereotaktisch registriert. Vier Lichtpunkte von 0.09° Durchmesser und 0,18° Randabstand wurden so in das receptive Feldzentrum projiziert, daß jeder Lichtpunkt allein etwa die gleiche Aktivierung auslöste (Sinuslichtreizung 0.5–25 Hz, Modulationsgrad>0.9, maximale Leuchtdichte 54–122 asb). Die räumliche Summation der Antwort im receptiven Feldzentrum auf 1–4 Lichtpunkte wurde quantitativ bestimmt. Die Resultate lassen sich am besten durch Modelle mitmultiplikativer lateraler Vorwärtsinhibition im receptiven Feldzentrum deuten [Gl. (5–7)].

Der Hemmungskoeffizientk i in diesen Gleichungen nahm mit Reizfrequenzen zwischen 3 und 10 Hz ab und über 10 Hz wieder zu. Die Resultate beweisen, daß die räumliche Summation der Erregung im RF-Zentrum nicht linear ist und von den zeitlichen Frequenzeigenschaften des Reizmusters abhängt.

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Grüsser, O.J., Schaible, D. & Vierkant-Glathe, J. A quantitative analysis of the spatial summation of excitation within the receptive field centers of retinal neurons. Pflugers Arch. 319, 101–121 (1970). https://doi.org/10.1007/BF00592490

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