Animals were rotated through 180 degrees at a rotation step of 1.26 degrees (1833-BM1 cells) and 0.9 degrees (4T1 cells).
Numerical results of the natural frequencies, mode shapes and steady state response of a rotating, stepped two-span shaft are presented.
To collect all the necessary information, the crystal must be rotated step-by-step through 180°, with an image recorded at every step; actually, slightly more than 180° is required to cover reciprocal space, due to the curvature of the Ewald sphere.
Samples were rotated over 360° at rotation steps of 0.2°.
The best-fit angle of rotation was the angle at which the rate map from session 2, rotated in steps of 6°, correlated maximally with the rate map from session 3. It has been shown in mice that under conditions of minimal attentional load, roughly 1/3 of place cells spontaneously remap (Kentros et al., 2004).
Firing rate maps in S6 were rotated in steps of 1° until up to 360° counterclockwise.
The retarder was rotated in steps of 10° for a total of 180°.
For each cell, firing rate maps in S6 were rotated in steps of 1° until up to 360°.
The stationary grating was adopted because the subject reported that stationary grating, when rotated in steps (see below), could be perceived more smoothly.
Gridness scores were calculated following previous studies (Sargolini et al., 2006), by taking the spatial autocorrelation of each firing field (a region corresponding to a circle with radius λgrid/2 and a centre in the middle of the autocorrelation function has been removed) and rotating in steps of three degrees.
