Women's caregiving and perceptual responses to young infants 1 cries were assessed as a function of parity and cry cause. Ss cared for a crying infant manikin in a simulated baby-sitting situation. Mothers and nonmothers were quite similar in basic features of their caregiving behaviors, suggesting that the effects of parity may be to fine-tune skills that many women bring to the task of caring for young infants. The specific cause of the cry (hunger or pain) was associated with few differences in caregiving behavior, even though a subsequent perceptual task showed that subjects reliably discriminated the two cries. Further analyses of the perceptual data indicated that cry sounds communicate information about the general distress level of the infant better than information about specific causes. Thus, although the sound of the cry may inform caregivers about overall distress level, caregiving behaviors appear to be determined by additional factors.
Ultrastructural and lectin-binding studies have established that the melanotic encapsulation reaction of Aedes aegypti Liverpool strain against inoculated Dirofilaria immitis microfilariae (mff) is a hemocyte-mediated reaction. Total hemocyte counts from mff-inoculated (= immune-activated), saline-inoculated, and uninoculated female A. aegypti were determined using a hemocoel perfusion technique. Total hemocyte populations in uninoculated mosquitoes were significantly larger in younger mosquitoes, but no significant change was noted as mosquitoes aged beyond 14 days. Hemocyte populations in immune-activated mosquitoes increased from 1 to 3 days postinoculation (PI) and decreased on days 4 and 5 PI. Hemocyte populations at 1 to 4 days PI were significantly elevated in mff-inoculated A. aegypti as compared with saline-inoculated controls. Saline-inoculated mosquitoes displayed little change in total hemocyte numbers from 1 to 5 days PI, and their hemocyte populations were similar to those seen in uninoculated insects of the same age. Experiments involving the inoculation of [3H]thymidine along with mff or saline alone and studies involving the administration of colchicine suggest that increased hemocyte populations in immune-activated A. aegypti are a result of mitotic division of circulating blood cells.
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