In the text, the author shows how we are proud to imagine that people from the past or the future are different from us because of the technology that existed and will exist in each era. The author shows that this is a defect in our personality, by imagining that technology shapes people in some way, in addition to shaping the activities that we perform with these technologies.
The author states that people from the past were like us, but with less technology. To reinforce this idea, she uses communication devices (cell phone, phone, smartphone, skipe, among others) to show that the most archaic models had the same purpose (to allow people to communicate) as the most modern devices that we know today. Which shows that in the past, people had the same communication needs as us, they just didn't do it as quickly and efficiently as we do today. However, we have a hard time imagining this, and we think that the population of that time is different from us.
It can be deduced that the author's argument regarding the central idea is that it shows how we are proud because people from the past are different from us because of the technology that existed.
It should be noted that a central idea simply means the main idea that's in a story. It's simply what the author wants the readers to know.
In this case, the author's argument regarding the central idea is that it shows how we are proud because people from the past are different from us because of the technology that existed.
In this case, technology shapes people in some particular way.
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