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The local electroretinogram (LERG) was recorded with microelectrodes from the intact eye in response to focused spots and annuli delivered by a dual-beam ophthalmoscope. The d.c. component was readily isolated from the b-wave on the basis of a lower threshold, smaller summation area, and greater resistance to light adaptation, thereby supporting a hypothesis that separates these components. At high flash intensities the d.c. component increased in duration as its decay was delayed; a slowing in decay rate also occurred and an earlier off-response was revealed. These effects were influenced by flash duration and the level of light adaptation. The late receptor potential was also recorded from the area centralis after clamping the retinal circulation at the optic disk. At moderate levels of light adaptation it was isolated from the c-wave and exhibited a rapid decay-phase. The behavior of the late RP in response to increases in flash intensity and duration paralled the behavior of the d.c. component. (Author).
Ganglion cell responses were recorded with microelectrodes from the intact eye to focused spots and annuli of light delivered by a dual-beam ophthalmoscope. Only concentrically organized circular receptive fields were analysed. Thresholds for optimal center and surround stimuli were approximately equal, as were the latencies of on-responses from the center and surround. With whole-field stimulation center-dominance was a function of light intensity. Off-responses and center-surround interaction were observed with brief flashes (5 msec, 10 msec). With increases of flash duration the duration of the on-response did not increase by the full increment of the flash until the flashes were 50 to 80 msec. At high-flash intensities the on-response extended into the off-period and the off-response weakened and disappeared; it occurred with both on-excitation and on-inhibition and for the responses of both center and surround. These intensity effects were also studied in an intracellular recording; at high intensities, the rate of repolarization of the postsynaptic potential decreased, and the latency of repolarization was delayed. (Author).
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