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In a laboratory experiment, female Cope’s gray treefrogs were less likely to choose the most attractive call, took longer to decide, and more often made no choice as researchers added more call alternatives. Because the recorded calls played one at a time, the result points to decision-making overload—not overlapping noise—as an explanation in this controlled setup. It does not show that females in wild choruses actually mate with less-preferred males.
What the frog experiment tested
Claire Therese Hemingway and colleagues studied 60 female Cope’s gray treefrogs (Dryophytes chrysoscelis) captured from breeding choruses in East Tennessee. In the laboratory, each frog could approach a speaker playing a long, attractive recorded call or speakers playing shorter, less attractive calls. Researchers varied the number of distractor calls: one, three, or seven. The alternatives were recordings, not live male frogs.
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In the breeding season, males of this species gather in choruses and advertise acoustically. Females attend to several call traits, including call length; the study account describes longer calls as more attractive. The experiment asked whether adding less-attractive alternatives changed females’ ability or willingness to select the preferred call. The University of Tennessee’s October 1, 2026 account of the study identifies the underlying paper as published in iScience.
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What happened as alternatives increased
With more distractor calls, females were less successful at selecting the attractive target, took longer to decide, and more often made no choice during the ten-minute trial. Together, these responses are consistent with choice overload in the tested setting: a larger set of alternatives made choosing more difficult or less likely.
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The finding is about responses in this particular experiment, not a measured change in mating success. The study did not establish that females that delayed or deferred choice later mated with males whose calls they found less attractive.
Why the researchers separated overload from noise
In a natural chorus, calls can overlap. One sound may make another harder to hear or distinguish, a sensory interference called energetic masking. That is different from choice overload, in which the number of alternatives taxes decision-making.
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The laboratory playback was sequential: calls did not overlap. That design removed energetic masking as an explanation for the decline in target selection in the experiment, helping researchers isolate the possible effect of more alternatives. It does not mean masking is unimportant in a real chorus, where females encounter overlapping calls and other sensory demands.
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If females have more difficulty consistently expressing a preference in larger groups, that could affect sexual selection—the process through which differences in mating success shape traits across generations. The researchers also raise the possibility that less-attractive males could benefit from joining larger choruses, where a female’s choice may be more difficult.
These are evolutionary implications and hypotheses, not demonstrated outcomes. The experiment did not measure which males mated in the wild, changes in male traits across generations, or population-level effects.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What remains unknown in wild choruses
The arena simplified natural conditions: it omitted overlapping calls, vegetation, and predator risk, and offered no more than eight calls. In a real chorus, sensory interference and decision-making demands may act together. Whether choice overload makes females take longer to choose in the wild—or leads them to mate with males they would otherwise find less attractive—remains an open question.
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As Hemingway, an assistant professor of Ecology & Evolutionary Biology at the University of Tennessee, put it: “The next step in this research is figuring out how much choice overload matters in a real chorus, where calls do overlap, and where sensory processing and cognitive processing are probably both at play.”
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