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. Author manuscript; available in PMC: 2012 Apr 4.
Published in final edited form as: Exp Brain Res. 2009 Mar 13;195(1):45–57. doi: 10.1007/s00221-009-1751-3

Figure 5.

Figure 5

Comparison of VO and PVP neuronal responses in rhesus and cynomolgus monkeys during different paradigms. (A) Average vestibular and neck sensitivity of PVP neurons measured during pWBR and BUH rotations, respectively. Responses were normalized relative to vestibular sensitivity obtained during pWBR. PVP neurons in rhesus monkey exhibit negligible neck proprioceptive sensitivity (BUH, black bar), while those in cynomolgus monkey are significantly modulated (BUH, white bar). Although, sensitivities were slightly attenuated during PHB rotations compared to pWBR, the difference was not significant for cynomolgus PVP neurons. During active eye-head gaze shifts, the modulation of rhesus PVP neurons (black bars) was reduced when compared to passive movements (rhesus normalized sensitivity = 0.46 ± 0.14). However, during the post gaze shift interval, neuronal sensitivities were similar to those obtained during PHB rotation (rhesus normalized sensitivity = 0.96 ± 0.34 vs. 0.99 ± 0.05, respectively). Data for rhesus PVP neurons was taken from Roy and Cullen (2002; n = 24 for pWBR, gaze shifts and post gaze shifts, and n = 12 for BUH and PHB). (B) Average vestibular and neck sensitivity of VO neurons measured during pWBR and BUH rotations, respectively. Responses were normalized relative to vestibular sensitivity obtained during pWBR. VO neurons in rhesus monkey exhibit negligible neck proprioceptive sensitivity (BUH, black bar), while those in cynomolgus monkey are significantly modulated (BUH, white bar). Responses of VO neurons in the cynomolgus monkey during PHB rotations were significantly decreased compared to those obtained during pWBR (PHB, white bar). In contrast, rhesus monkey VO neurons did not show a change in their responses (PHB, black bar, normalized sensitivity = 0.96 ± 0.08). During gaze shifts and post-gaze shift intervals, neuronal responses were attenuated in both species (rhesus monkey normalized sensitivity = 0.31 ± 0.08 and 0.32 ± 0.05, respectively). Data for rhesus VO neurons was taken from Roy and Cullen (2001; n = 40 for pWBR, gaze shifts and post gaze shifts, n = 15 for BUH, and n = 23 for PHB). See text for details of cynomolgus monkey data. * shows significant difference with pWBR, † shows significant difference between rhesus and cynomolgus monkeys.