Nature Neuroscience
8, 99 - 106 (2004)
Published online: 19 December 2004; | doi:10.1038/nn1373
Neural population code for fine perceptual decisions in area MTGopathy Purushothaman
& David C BradleySupplementary Fig. 1 (gif 10K)
Neural precision is plotted as a function of the slope of the direction-tuning curve near the stimuli directions. Supplementary Fig. 2 (gif 17K)
Psychometric function for reference stimulus directions of 85° and 95°, pooled from data over several recording sessions. If the monkey had ignored the reference, then the responses would have been at the 100% for all direction differences about 85° reference and at 0% for all direction differences about the 95° reference, resulting in a flat line near the 50% level. Supplementary Fig. 3 (gif 16K)
Threshold ratio of neuron to behaviour calculated using the firing rates from the test interval (for the trials in which the test direction = reference direction) as the reference histogram. These ratios are not statistically different from those in Fig. 3a (t-test, p>0.8). Supplementary Fig. 4 (gif 10K)
Thresholds are shown as a function of integration time. The top figure shows the psychophysical data and the bottom, the neural data. Supplementary Fig. 5 (gif 21K)
Psychophysical and neurometric functions for three neurons are shown comparatively for two ranges of direction-differences. The left row shows psychometric and neurometric functions for the smaller range of direction differences and the right row for the larger range. Each row of data is for one neuron. "N Thresh" is the neurometric threshold and "P Thresh" is the psychophysical threshold. Supplementary Fig. 6 (gif 10K)
Psychophysical thresholds are compared for the two ranges of direction-differences. Supplementary Fig. 7 (gif 14K)
Ratio of the neurometric threshold estimated with the wider range of direction differences (-16°,+16°) to that estimated with the shorter range (-3°,+3°) is shown for 132 neurons. Supplementary Notes (pdf 155K)
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