Direction tuning of individual retinal inputs to the turtle accessory optic system
Kogo, Naoki × Rubio, Doris Mc gartland Ariel, Michael #
The Society for Neuroscience
Journal of Neuroscience vol:18 issue:7 pages:2673-2684
Neurons in turtle accessory optic system [basal optic nucleus (BON)] were recorded to study convergence of retinal afferents, using whole-cell patch electrodes in a reduced in vitro brainstem preparation with the eyes attached, BON cells primarily exhibit EPSPs from a contralateral retinal ganglion cell input and generate an output of action potentials. Visual responses were evoked by different directions of either full-field or local moving patterns. Direction tuning of action potentials was compared with that of EPSPs detected by passing the membrane voltage through an AC amplifier and window discriminator. This rough measure of retinal input indicated that the direction tuning of the full-field excitatory input from the retina matched that of the spike output for the same BON cell.