Fig. 5

Mean change of decoders’ ADs on neuronal SNR and uniformity. These panels depict the AD change of each decoder depending on SNR change (from − 2.31 to 2.45 dB) of the neuronal ensemble with fixed uniformity (from 20 to 100%, step of the 20%). Solid red line denotes AD of the KF, green is that of the OLE, and purple is that of the PVA. Top square-dots signify SNR ranges which are a significantly different (based on Watson’s U2 test, p < 0.01) between decoders. The red square-dot denotes significant range between AD of the KF and that of the OLE. The green and purple also denote significant ranges regarding the KF–PVA and the OLE–PVA. On the first panel, because SNR variation has the large interval of 0.24 dB, the purple square-dots were filled although the OLE–PVA between − 1.7 and − 1.5 dB was not significant