Behavioral contagion is suggested to promote group coordination that may facilitate activity transitions, increased vigilance, and state matching. Apart from contagious yawning, however, very little attention has been given to this phenomenon, and studies on contagious yawning in primates have so far only focused on Old World monkeys and apes. Here we studied behavioral contagion in common marm...

In the course of some studies (1) on the vasomotor activity in human fingers I noted that definite circulatory changes occur during spontaneous yawning. An attempt to correlate these observations with existing data on yawning revealed that the few pertinent studies of this subject have not found their way into British or American publications. Although yawning and its associated phenomena appea...

Yawning can be regarded as a prototype of stereotypical behaviors that has been recycled through evolution for different purposes. These purposes are combined with the increasing complexity of the central nervous system during evolution, and correlated with the richness of social interactions. In this chapter, past and current hypotheses concerning the generation and usefulness of yawning are d...

Systemic administration of D2-like dopaminergic-receptor agonists increases yawning behavior. However, only a few studies have been done in animals with pathological conditions. The taiep rat is a myelin mutant with an initial hypomyelination followed by progressive demyelination, being the brainstem one of the most affected areas. In our experiments, we analyzed the effects of systemic adminis...

A specific role for the dopamine D3 receptor in behavior has yet to be elucidated. We now report that dopamine D2/D3 agonists elicit dose-dependent yawning behavior in rats, resulting in an inverted U-shaped dose-response curve. A series of experiments was directed toward the hypothesis that the induction of yawning is a D3 receptor-mediated effect, whereas the inhibition of the yawning observe...

Cortisol and yawning have been proposed as new potential biomarkers for the early detection of signs of neurological disease. Recent evidence from neuroscience has shown that there is communication between the motor cortex and more remote but vital centres such as the brain-stem and hypothalamus. Hormonal as well as neuronal links form the prosed network that influences and monitors the regulat...

A 63-year-old man presented with aphasia and right arm paralysis (Medical Research Council [MRC] grade 0), sparing the leg (video 1 on the Neurology® Web site at Neurology.org). With yawning, his right arm consistently rose to his chest (video 2). Paralysis resumed after yawning. MRI confirmed an acute ischemic stroke in the left middle cerebral artery distribution (figure). This movement cease...

The number of 88 rats was chosen, after 21 days, they were ablactated and categorized them as following groups:
 control group 1 has a cage 8 in social condition. After 6 weeks saline injection (1mg / kg), the yawning behavior is recorded for 60 minutes. Group 2 conditions receiving ethanol months, each serving 600 mg kg. 3 isolation without treatment with agonist antagonist, Opioid alcoho...

A gaping movement of the mouth, commonly called yawning, has been identified in all major classes of vertebrates, including fish (BAERENDS & BAERENDS, 1950; MORRIS, 1954), amphibians and reptiles (MCCUTCHEON, 1970), birds (MARLER, 1956; DFLIUS, 1967) and mammals (CARPENTER, 1940; BARBIZET, 1958; SCHALLER, 1972). Detailed studies of the ethology of this behavior pattern include those of SAUER & ...