The Journal of Neuroscience, December 27, 2006, ():

Receptive Field Properties of the Macaque Second Somatosensory Cortex: Nonlinear Mechanisms Underlying the Representation of Orientation Within a Finger Pad
J. Neurosci. Thakur et al.
26: 13567
Supplemental Data
Files in this Data Supplement:
- supplemental material
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Figure S1. Hypothetical receptive field structures and corresponding vector fields. A perfectly position invariant receptive field structure (top left) will produce a vector field of constant preferred orientation (top right). An excitatory spot in the center of the finger pad (middle left) will produce a divergent vector field (middle right). An inhibitory spot in the center of the finger pad (bottom left) will produce a curled vector field (bottom right).
- supplemental material
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Figure S2. Views of the stimulus bar and contact patch. The stimulus bar (Protocol Two) was a 90 degree wedge embossed on a 25mm wide circular disk. The apex of the wedge was 500 microns above the disk surface. The contact patch of the compressed finger pad was approximately 10mm long and 8mm wide. Shown are a bottom view of the stimulus bar and contact patch (top), as well as a side view of the bar (bottom) which shows its wedge-like short axis.