Bennett, R. R.Tunstall, J.Horridge, George Adrian2019-09-170044-362Xhttp://hdl.handle.net/1885/170470Intracellular electrode recording techniques were used to measure the responses of single visual cells in the locust to various intensities of monochromatic lights of wavelength 350 to 600 mμ. Response-energy curves, found for ten cells to be parallel at all wavelengths, were used to deduce the relative number of quanta required to evoke a constant response. The average response-energy curve from these ten cells was used in obtaining spectral sensitivity data for another ten short-lived cells, where only one response at each wavelength could be obtained. Spectral sensitivity curves for all twenty cells showed a peak in the blue-violet (maximum about 430 mμ) region of the spectrum. In addition, all cells showed some green sensitivity (maximum about 515 mμ) but in different cells this varied from 15% to 100% of the blue-violet maximum for the cell. The magnitude of the errors is discussed. The results are consistent with the hypothesis that two visual pigments which fit a Dartnall nomogram for rhodopsin are contributing, in various ratios, to the spectral sensitivity of every cell.12 pagesapplication/pdfen-AU© Springer Verlag (Germany)Relative NumberGreen SensitivitySpectral SensitivityElectrode RecordingSensitivity Data1967-0610.1007/BF00342254