When two successive sounds come too close together, some individuals may hear only one.

• If they were even closer in time, you might still hear two clicks, although someone with a brain dysfunction might only hear one.

                       (click) (click)
     -------------------|------|-------------------------------
                            (time)

• But, if they were even closer, although there will still be two clicks, we all would eventually come to the point where we would perceive only one.

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