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    • Member Info
      • Native Language:
      • Chinese
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      • China
      • Current Location:
      • China

    • Join Date: Apr 2012
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    #1

    all on his own

    One African grey parrot Alex is said to have the cognitive abilities of a five-year-old child. Alex can identify 50 different objects, seven colors, five shapes, quantities up to six, and the concepts of bigger, smaller, same and different. Also Alex is considered to make reasoned decisions. During an experiment, researchers gave Alex different-colored blocks in sets of two, three and six. When asked which color group had five blocks, Alex replied, “None.”And he answered the same in repeated tests. Obviously, he interpreted the concept of “none” as an absence of quantity all on his own.

    What does the underlined sentence mean in this passage?
    Thanks!
    Jason!

  1. charliedeut's Avatar
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      • Native Language:
      • Spanish
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      • Spain
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    • Join Date: Oct 2009
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    #2

    Re: all on his own

    Quote Originally Posted by jasonlulu_2000 View Post
    Obviously, he interpreted the concept of “none” as an absence of quantity all on his own.
    Hi Jason,

    It means that Alex learnt that 'none' equals 'zero' (absence of quantity) without anyone teaching it to him.

    charliedeut
    Please be aware that I'm neither a native English speaker nor a teacher.

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