p344fig09.14 (top row, left column) By fitting MT tuning curves with Gaussian receptive fields, a tuning width of 38° is estimated, and leads to the observed standard spiral tuning of 61° in MSTd. (bottom row, left column) The spiral tuning estimate in Figure 9.16 maximizes the position invariant of MSTd receptive fields. (top row, right column) Heading sensitivity is not impaired by these parameter choices.<BR>||  [Spiral tuning (deg), position invariance (deg^(-1)), heading sensitivity] versus log polar direction tuning σ (deg)