Figure 2 | Scientific Reports

Figure 2

From: Variational autoencoder provides proof of concept that compressing CDT to extremely low-dimensional space retains its ability of distinguishing dementia

Figure 2

Generative factors of clock drawing are discovered using traversals over VAE latent space. Different regions of the two-dimensional manifold constructed by the VAE map to specific artistic features/anomalies of clock drawings. Latent Dimension 1 = Z0, Latent Dimension 2 = Z1. Left side of the VAE latent space: direction of eccentricity of reconstructed clocks reverses from left to right as Z1 increases from − 4 to + 4 given Z0 =  − 4. This change is correlated with a decrease in clock size shown by darkening of the reconstructed clock. Right side of the VAE latent space: distance of intersection point of clock hands from the geometrical clock center increases as Z1 changes from − 4 to + 4 given Z0 = 4. This change is correlated with a loss of the circular clock boundary. Top half of the VAE latent space: size of the clock hands increases as Z0 changes from − 4 to + 4 given Z1 = 4. This change is correlated with the loss of clock face boundary. Bottom half of the VAE latent space: angle of eccentricity of the clock decreases as Z0 changes from − 4 to + 4 with Z1 =  − 4. This change is correlated with an increase in clock size. X-axis of the VAE latent space: size of the clock increases as Z0 changes from − 4 to + 4 with Z1 = 0.

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