Figure 2. Inspiratory responses to areolar odor and to seven reference stimuli.

Mean (± sem) of maximum change of inspiratory amplitude (IA_max) in newborns during (2-sec stimulus blocks 1–5) and after (2-sec post-stimulus blocks 6–10) binarinal presentation of the following stimuli: A) areolar secretion; B) blank (water); C) sebum; D) human milk; E) cow milk; F) formula milk; G) vanillin; and H) habitual milk (mother's milk in breast-fed and formula milk in bottle-fed infants). Key to abbreviations in legend of Figure 1; values of IA_max in response to AG odor that differ significantly from the baseline are indicated by different letters; comparisons between the different stimuli (bold curves) and AG odor (red curves) are indicated by *, ** and ***: p<.05, .01 and .005, respectively; n = 16).