Journal: Journal of Neurophysiology
Article Title: Visual responses in the dorsal lateral geniculate nucleus at early stages of retinal degeneration in rd 1 PDE6β mice
doi: 10.1152/jn.00231.2019
Figure Lengend Snippet: Spatial receptive fields in the rd1 Opn1mwR dorsal lateral geniculate nucleus (dLGN) A and B: effective photon flux (mean ± SE) of the background and bar stimuli used for receptive field mapping in the Opn1mwR and rd1 Opn1mwR mice, respectively, with calculated Michaelson contrast (%, mean ± SE) for each photopigment. Note that rod contrast is not relevant for rd1 mice because these animals lack rods at the age of recording. C: heat map for representative single units from the dLGN of an Opn1mwR (top) and rd1 Opn1mwR (bottom) mouse showing change in firing rate (spikes/s; scale at right) in response to the appearance of vertical bars (250 ms starting at time 0; 13° width at 4.5° resolution) as a function of location on azimuth of bar center. D: peak response amplitude (change in firing rate, mean ± SE) as a function of bar position for the 2 units in C, fit with a Gaussian function. E: box-and-whisker plot showing that receptive field diameter (mean ± SE) for all light-responsive units was significantly larger in Opn1mwR (12.17 ± 0.5°; n = 38 units; green bar) than in rd1 Opn1mwR mice (9.96 ± 0.3°; n = 48 units; black bar; ***P = 0.0005, unpaired t test). Box shows interquartile range; line in box is the median; cross is the mean; and whiskers indicate minimum to maximum range. F: peak response amplitude (change in firing rate, mean ± SE) was significantly larger in Opn1mwR (10.1 ± 1.2 spikes/s) than in rd1 Opn1mwR mice (7.02 ± 0.8 spikes/s; *P = 0.03, unpaired t test). G: response latency (mean ± SE) was significantly increased in rd1 Opn1mwR (177.9 ± 5.4 ms) compared with Opn1mwR mice (112.3 ± 4.46 ms; ****P < 0.0001, unpaired t test).
Article Snippet: The spatial receptive field size for single units meeting this criterion was estimated by fitting a two-dimensional Gaussian fit ( R 2 > 0.7) to the relationship between response amplitude and bar position in GraphPad Prism 7 (GraphPad Software).
Techniques: Whisker Assay
