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PubMed2001

Do infant rats cry?

In the current revival of interest in the emotional and mental lives of animals, many investigators have focused attention on mammalian infants that emit distress vocalizations when separated from the home environment. Perhaps the most intensively studied distress vocalization is the ultrasonic vocalization of infant rats. Since its discovery, this vocalization has been interpreted both as a communicatory signal for the elicitation of maternal retrieval and as the manifestation of emotional distress. In contrast, the authors examined the cardiovascular causes and consequences of the vocalization, and on the basis of this work, they hypothesized that the vocalization is the acoustic by-product of the abdominal compression reaction (ACR), a maneuver that results in increased venous return to the heart. Therefore, the vocalization may be analogous to a sneeze, serving a physiological function while incidentally producing sound.

Adrenergic alpha-Agonists↗
PubMed2003

Can anthropomorphic analyses of separation cries in other animals inform us about the emotional nature of social loss in humans? Comment on Blumberg and Sokoloff (2001).

M. S. Blumberg and G. Sokoloff's (2001) critical analysis has raised doubt whether emotional feelings can be studied in nonhuman animals, and they have reaffirmed the inappropriateness of anthropomorphic reasoning in animal research. They argue that the ultrasonic distress calls of infant rats may be little more than acoustic by-products of bodily adjustments to physiological stressors. This author argues that comparable vocalizations in other species do index separation distress. Considering that there may be deep homologies in the neural systems that govern such emotional processes in many mammalian species, anthropomorphic-zoomorphic reasoning may be a viable cross-species research strategy as long as it is limited to neuroscientific contexts that lead to testable predictions in humans and other animals.

Affect↗
PubMed1972

Crying in infancy.

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Child Development↗