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. 2001 Sep 15;21(18):7284–7292. doi: 10.1523/JNEUROSCI.21-18-07284.2001

Table 1.

Means and SDs of slopes calculated for CA1 and DG place fields on the first and second halves of the track

CA1 fields DG fields
Light Dark Light Dark
First half 0.77  ± 0.27 0.82  ± 0.19 0.81  ± 0.22 0.87  ± 0.19
Second half 0.22  ± 0.22 0.18  ± 0.23 0.21  ± 0.26 0.23  ± 0.24

The slope was calculated by connecting the centers of mass of the spikes discharged on at least three outbound journeys. A slope of 1 corresponds to a place field that maintains a constant relationship with the box, and a slope of 0 corresponds to a place field that is fixed in the reference frame of the track and the surrounding fixed cues. Note that on the first half of the journey the slopes have higher values, indicating that the place fields remain aligned with the box, whereas on the second half they tended to align with the fixed reference frame.

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