- Study ganglion cell responses to 'natural'stimuli. Scenes from nature were projected onto the mammalian retina to simulate motion: saccades, optic flow, object motion, and fixational eye movements. We studied 7 ganglion cell types: ON and OFF brisk–transient, ON and OFF brisk–sustained, ON and ON–OFF direction–selective (DS), and local–edge. Peak rate was the highest 5 ms time bin in the PSTH; firing fraction was the fraction of time bins during which a cell fired≥ 5% of its peak. Temporal precision was measured by spike time jitter across stimulus repeats. Spike–count distributions were computed with sliding windows of 100–500ms. Information rates were estimated by the direct method. Efficiency was information rate normalized by the maximum possible information at the average spike rate. Results are compared by independent t–test.