Research Article
Effects of Immediate or Delayed Estradiol on Behavior in Old Menopausal Macaques on Obesogenic Diet
Table 4
Ethogram of behaviors coded during the Human Intruder Test.
| Behavior | Operational definition |
| Vigilant | Subject’s gaze is not directed toward human intruder | Freeze | Tense body posture with no movement and no vocalization | Locomotion | Active behavior resulting in movement from original location (e.g., moving across cage) | Stationary | Focal individual sitting quietly, not engaged in other behavior | Stereotypical behavior | Repetitive behavior with no apparent purpose | Vocalizations | Includes coo and shriek | Yawn | Subject opens mouth very wide, baring upper teeth | Self-directed anxiety behavior | Subject scratches or shakes (quick action of rotating head and top of shoulders back and forth) |
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