“…Riemannian manifold RVM CV [27] channel cross-covariance (CCV) CNN+LSTM+DAE CV [28] channel cross-correlation matrix LSTM CV [29] DWT DNN CV [30] Bag of Features (BoF) RNN LOSO-CV [30] Visual (Spain): "arriba" ("up"), "abajo" ("down"), "izquierda" ("left"), "derecha" ("right"), "seleccionar" ("select") 4-25 [31] 4-25 DWT RF CV [32] 0-64 Statistics, RWE [33] 40-50 Bag of Features (BoF) NB + TL CV [34] Audiovisual (Spain) "/a/", "/e/", "/i/", "/o/", "/u/", "arriba" ("up"), "abajo" ("down"), "izquierda" ("left"), "adelante" ("forward"), "atrás" ("backward") 2-40 RWE RF CV [35] CNN CV [36] CNN layer, FBCSP [37] CNN + TL LOSO-CV [38] word embedding + Siamese encoder kNN CV [39] Visual "/a/", "/e/", "/i/", "/o/", "/t/" 0.5-220 phase per band (Hilbert transform) SVM CV [40] Audio "/a/", "/e/", "/i/", "/o/", "/u/", "yes", "no", "left", "right". 0.1-70 RMS, zero-crossing rate, moving window average, kurtosis, and power spectral entropy RNN CV [41] Audio "Hi Bixby", "Call Mom", "Open Camera", "What's the weather".…”