The cоnversiоn оf а stimulus into а generаtor potential by a receptor is called ___________ A. conduction B. reception C. transduction D. perception
A schооl nurse is аssessing а child with suspected vаricella. Which finding is mоst characteristic of this illness?
Which оf the fоllоwing is NOT а generic objective of а compensаtion system?
Why Dо We See Sо Mаny Things аs "Us vs. Them"? [A] It is а cоmmon misfortune around the world: People get along well enough for decades, even centuries, across lines of race or religion or culture. Then, suddenly, the neighbors aren't people you respect, invite to dinner, trade favors with, or marry. Those once familiar faces are now Them, the Enemy, the Other. And in that clash of groups, individuality vanishes and empathy dries up, as does trust. It can happen between herders and farmers in Nigeria or between native-born people and immigrants in France or the United States. The situations are very different, and the differences are important. But so is the shared root of their problems: People everywhere are "identity crazed," as the evolutionary psychologist John Tooby has put it. We can't help it: We're wired from birth to tell Us from Them. And we inevitably (and sometimes unconsciously) favor Us - especially when we feel threatened. [B] Of course, humans share that trait with many other creatures, from ants to salmon to macaques. What other creatures almost never do, though, is change their group perceptions and actions. The birds and bees kept to their tribes when Yugoslavs turned into warring Croats, Serbs, and Bosnians. Only humans - Hutu and Tutsi - could decide they are no longer countrymen, after peacefully sharing a homeland for centuries. Only humans can switch from feeling united as one American nation to feeling divided between conservative red states and liberal blue ones. [C] Our capacity to change our perceptions also offers some hope, because it permits people to shift in the direction of more inclusion, more justice, more peace. In Nigeria and other places around the world, communities torn apart by group conflict are putting themselves back together with help from a surprising source: scientists who study the mind. Their methods are also helping to improve community relations with police in Toledo, Indianapolis, and other U.S. cities. [D] I am a leopard. Jay Van Bavel, a neuroscientist at New York University who studies group identity, gave me that label last summer when I was lying in an fMRI scanner near his office. While in the machine I was shown photos of faces - 12 young white men and 12 young black men. The scanner tracked my brain's activity as I connected these individuals to group identities. Having been raised in the United States, I have lived with my country's racial categories all my life, and it wasn't difficult to do one of my experimental tasks: classify each face according to its skin color as either black or white. However, I also had to work with another set of categories. The men in the photos were on one of two teams, I was told: Tigers or Leopards. The screen told me who was on which team and drilled me on the details until I had it down. But I wasn't a neutral observer: I'd been told that I was a Leopard. [E] My scanner tasks allowed Van Bavel to compare my brain's activity as it worked, first with a familiar and consequential group identity (race in America) and then with a group identity that was effectively meaningless. [F] My brain lit up differently depending on whether I perceived an in-group face (for me, a Leopards team member) or an out-group (Tiger) face. For example, my orbitofrontal cortex, a brain region associated with liking, sparked up more when I saw a face from my in-group. So did the fusiform gyrus, a region tied to processing the identity of faces. [G] The experiment - and dozens of others like it during the past 20 years - confirmed several important facts about exactly how the human brain is "identity crazed." The scans show, for one, that a lot of our perceptions and emotions about groups happen outside our awareness or control. I have no conscious preference for white people over black people. On the contrary, like most Americans, I abhor racism. Yet, had I not been told I was a Leopard, I almost certainly would have shown an unconscious preference for white faces over black ones. That I did not illustrates a different important finding in Van Bavel's research: New team identities can easily supplant old ones in our minds. All Van Bavel had to do was tell me about two teams and inform me that I was on one. That was enough for my brain to prefer Leopards over Tigers as quickly and strongly as it normally distinguishes blacks and whites. [H] The scans reflected a key fact about human groupishness: We have keen mental radar that seeks to learn what groups matter around us and which ones we are members of. And this radar is always on. Even as we sit comfortably in our racial, religious, national, and other identities, our minds are alert to the possibility of new coalitions. [I] It's not hard to see why humans should have evolved to care about their teams and their place on those teams. Relying on each other is a sound survival strategy for a frail, noisy creature without a lot of built-in weapons. Living in groups is a ticket to survival, which is why most primates live in them. [J] "This is how person perception generally works," Van Bavel told me. "In the first split second, we judge people on the basis of their group memberships." Caring about your group memberships isn't something you have to learn, like reading or driving. It's something you do automatically, like breathing. [K] In fact, much of our sensitivity to groups begins long before we can speak. Very young babies prefer adults who look like their caretakers over adults who look different; some evidence shows they also prefer the foods their mothers ate while pregnant or breastfeeding over novel ones, and they like the sound of the language they heard in the womb and early in life much better than an alien tongue. These preferences continue. In adulthood most of us are better at recognizing the faces and reading the emotions of people who look and act like us. The following sentence would be best placed at the end of which paragraph? In fact, there is no human society without clear lines that distinguish various groups.