  When we view visualizations, we not only have a visual representation of the
data, but also a verbal one. Recent work has shown that these visual
representations of data can be biased, such that the position of a line in a
chart will be consistently underestimated. But are the verbal representations
of position encodings also biased in the same manner, or is this a purely
visual bias that can be mitigated with verbal context? We explored the bias in
position reproductions for simple uniform lines for both visual and verbal
representations. We find that the direction of the bias changed depending on
the response modality, with visual reproductions showing a position
underestimation while verbal responses showed overestimation. This finding
indicates that, even for simple line charts, biases are still present for both
visual and verbal representations, although the directionality of this bias
depends on the modality.
