What is an auditory upward sweep? I was reading an article in nature communications, when I came across this sentence: "The ‘match’ rule was indicated by either a blue circle or a auditory upward sweep".So I tried googling what was an upward sweep, and came across this: "natural and complex vocalizations consist of basic elements such as upward sweeps, downward sweeps, constant frequency components, amplitude modulations..." I don't understand this. Can someone explain what is an upward sweep? Here is the link to the article: < But I think you have to pay to view the whole article, so here is another link that discusses the findings of the article: <

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It just means a sound that starts at a low frequency and goes up to a higher frequency like a whistle sound. Perhaps someone can give you an example sound file and/or a spectrogram representation of it.