The attention triplet has appeared several times on this blog, and can now be illustrated as including the interaction of different brains.
A visitor to my blog, Janet Kwasniak, tipped me to an article reporting a possible neurological basis for humanity’s unique powers of joint attention. Regulars on this blog will know that it leans toward an attention-based view of language. My working assumptions are that words are tools for piloting attention and that speech requires a speaker and a listener paying joint attention to a topic. Thus, the evolution of speech required the evolution of joint attention, so I was delighted when Janet told me about an article in last October’s Current Directions in Psychological Science, “Attention, Joint Attention, and Social Cognition,” by Peter Mundy and Lisa Newell (abstract here).
The article holds that human brains have two distinct attention systems which, when working together, produce joint attention. The older system, located in the rearward (posterior) part of the brain is reflexive and tracks external stimuli. When something moves, this system responds. A separate, voluntary system is located in the brain's frontal (anterior) region and pays attention to one’s own purposeful behavior.
These systems exist in humans and chimpanzees, but in humans the two can be integrated into one unified system that permits joint attention. For example, two people are seated in a restaurant booth facing one another. Suddenly the posterior attentional system of one customer directs his eyes toward the sight of a waiter pouring soup on a diner’s head. Meanwhile the customer uses his anterior system to say to the companion, “Will you look at that,” and point to the unexpected scene. Joint attention comes from the capacity to integrate these two, separately-developed brain systems.
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