Why human talking to phone like to draw on the paper?

Some people like to draw on paper while talking to phone. Isn't it strange? Why do they like to do such a thing, I asked my self. In my opinion, there are two reasons for that.

First, having pen or pencil in hand makes them feel more relaxed. Because usually when speaking to phone talker is receiving important information, and it might be necessary to put down some notes. May it be addresses, dates or hard-to-remember numbers. Also, it is verbal information talker receives, and as soon as words are said, they disappear. Adding down notes allows them more effectively follow conversations.

Second, one needs to focus attention on information that is received by ears and ears only. All other senses, meanwhile, must be ignored. And to avoid information that is presented by eyes and usually is unrelated to what conversation companion says, talker draws something very unrelated to the paper and looks at his work without a lot of interest. The received information must to be filtered, too, so occasionally when no important information is being received, talker keeps brain bussy by drawing something, but when important information is being received, talker immediately stop drawing and focuses all attention to ears.

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