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had been fixating

  • past perfect progressive
    of fixate.
    fixate
    verb (used without object)
    to obsessively concentrate one's attention (usually followed byon ).

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The dog was taught to focus constantly upon his master's eyes and then upon command to select the object which he, the master, had been fixating.

From Clever Hans (The horse of Mr. Von Osten): A contribution to experimental animal and human psychology by Oskar Pfungst