The theoretical concept used to explain the unease and discomfort felt by viewers for the motion capture animation in The Polar Express (2004) is known as the

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The uncanny valley is a theoretical concept that describes the discomfort and unease felt by viewers when they encounter human-like entities, such as robots or animation, that resemble humans but are not quite realistic enough. This is believed to happen when the entity is close to being realistic, but still falls short in some way, causing a sense of revulsion in the viewer. This concept is often used to explain the negative reaction to the motion capture animation used in The Polar Express.

The Theoretical Concept Used to Explain the Unease and Discomfort