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You have probably heard of this theory, in which the left and right halves of the brain are characterized, respectively, as logical versus intuitive, verbal versus perceptual, analytic versus synthetic, and so forth. The trouble is that none of these sweeping generalizations has stood up to careful scientific scrutiny. The dif­ferences between the left and right sides of the brain are nuanced, and simple, sweeping dichotomies do not in fact explain how the two sides function.

top and bottom portions of the brain have very different functions. This fact was first discovered in the context of visual perception, and it was supported in 1982 in a landmark report by National Medal of Science winner Mortimer Mishkin and Leslie G. Ungerleider, of the National Institute of Mental Health.

scientists trained monkeys to perform two tasks. In the first task, the monkeys had to learn to recognize which of two shapes concealed a bit of food.

These functions occur relatively close to where neural connec­tions deliver inputs from the eyes and ears—but processing doesn’t just stop there.

top parts of our frontal lobe can take into account the confluence of information about “what’s out there,” our emo­tional reactions to it, and our goals.

Four distinct cognitive modes emerge from how the top-brain and bottom-brain systems can interac

The two systems always work together. You use the top brain to decide to walk over to talk to your friend only after you know who she is (courtesy of the bottom brain). And after talking to her, you formulate another plan, to enter the date and time in your calendar, and then you need to monitor what hap­pens (again using the bottom brain) as you try to carry out this plan (a top-brain activity).

speak of differences in the degree to which a person relies on the top-brain and bottom-brain systems, we are speaking of differences in this second kind of utilization, in the kind of processing that’s not simply dictated by a given situation. In this sense, you can rely on one or the other brain system to a greater or lesser degree.

The degree to which you tend to use each system will affect your thoughts, feel­ings, and behavior in profound ways. The notion that each system can be more or less highly utilized, in this sense is the foundation of the Theory of Cognitive Modes. 

60 percent of disrespectful behavior came from above, 20 percent from colleagues on the same level and 20 percent from below. And half said they decreased their effort on the job after experiencing ongoing rude behavior

A related phenomenon is the transformation, courtesy of Facebook, of the verb “to like” from a state of mind to an action that you perform with your computer mouse, from a feeling to an assertion of consumer choice. And liking, in general, is commercial culture’s substitute for loving.

“Friendship networks dwindle as you get older, so this is an easy and nonawkward way to meet new people,” said Sen Sugano, the development director of Grubwithus. “You have your circle of friends, of course, and the people you work with, but expanding beyond that can be hard.”

Sonar, for example, is a new mobile application that combs a user’s connections on Facebook, Twitter and Foursquare and alerts them if they have any friends in the vicinity.

the company wants to leverage the dozens, or even hundreds, of connections that many people have already made online and see if they can use those to form new, meaningful friendships.

er parents divorced when she was a toddler, and she was raised in a crowded Brooklyn apartment by her mother, her mother’s sister and her grandparents, all of whom unstintingly adored her

“Four loving adults had made me the center of their lives

Always the smartest kid in the room (she was a remarkable test-taker), Turkle flourished early as an intellectually confident person, easily winning a scholarship to Radcliffe, support for graduate school at Harvard

Newly graduated from Radcliffe, she was in Paris during the May 1968 uprising and was shocked by the responses of most French thinkers to what was happening in the streets

Each in turn, she observed, filtered the originality of the scene through his own theories.

Few saw these galvanizing events as the demonstration they so clearly were of a hungry demand for new relations between the individual and society.

The anecdotes that illustrate this marriage encapsulate, in an inspired way, the dilemma Turkle has spent her whole life exploring:

My interests were moving from ideas in the abstract to the impact of ideas on personal identity. How did new political ideas change how people saw themselves? And what made some ideas more appealing than others?”

For the people around her, it embodied “the science of getting computers to do things that would be considered intelligent if done by people.” Nothing more exciting. Who could resist such a possibility? Who would resist it? No one, it turned out.

“The worst thing, to Seymour,” she writes, would have been “to give children a computer that presented them only with games or opaque applications. … A learning opportunity would be missed because you would have masked the intellectual power of the machine. Sadly, this is what has happened.”

In a memoir written by a person of accomplishment, the interwoven account of childhood and early influences is valuable only insofar as it sheds light on the evolution of the individual into the author of the memoir we are reading.

with Turkle’s story of her marriage to Seymour Papert her personal adventures struck gold.

“good conversation” was valued “more highly than common courtesy. … To be interesting, Seymour did not have to be kind. He had to be brilliant.” And if you weren’t the sort of brilliant that he was, you were something less than real to him.

electrified

the rupture in understanding between someone devoted to the old-fashioned practice of humanist values and someone who doesn’t know what the word “human” really means.