Fig. 4. Peristimulus time histograms and electrophysiological traces showing responses from the star-nosed mole. (A) The receptive field (RF) for each cell is presented on a schematic of the mole's nose. (B–G) Three classes of receptor were evident, showing the following responses: (D–F) Merkel-like response; (C,G) Pacinian-like response; (B) an RA response to the onset of compression. This receptor was also directional. An arrow on the RF diagram shows the preferred direction. Imp, impulses.