Title
Investigating Latencies In Acoustic Selection by Hyla chrysoscelis in the Presence of Informational Masking
Abstract
In this project, I investigated the effect of informational masking on the ability of female
frogs (Hyla chrysoscelis) to make a choice regarding a potential mate. Informational masking
refers to interference of noise in the brain, having the potential to hinder the frog’s ability to
recognize conspecific calls. I used the R program to analyze data from a series of tests performed
on actively mating treefrogs this summer. Specifically, I investigated how the latency, or the
time taken for the frog to make a choice, varied as a result of informational masking. In late May
and June, females were collected and placed one at a time in a soundproof chamber. Two forms
of discrimination tests were carried out, one where the signals differed in pulse rate, and one
where they differed in pulse number. For each type of test, there were trials involving a quiet
background, trials involving a control masker, and trials involving the informational masker.
Given background knowledge about this species of frog, it was predicted that
informational masking would result in the greatest latency. Following the same logic, it was
expected that the control masker would have an intermediate latency, and the quiet condition
would have the smallest latency. Results were not entirely conclusive for any tests, both when
incorrect choices were included and when they were filtered out. According to the pulse rate
findings, there was a slight trend for greater latency in the presence of maskers. However, there
was little difference between the effect of the Control Masker and the Informational Masker.
There was little difference between the graphs produced from all latencies and the graphs
produced only from correct choice latencies. Pulse number graphs did not produce a trend.
Overall, it was determined that latency may not be a good marker for observing the effects of
informational masking.
Description
Faculty Advisors: Mark Bee, Saumya Gupta
Funding information
This research was supported by the Undergraduate Research Opportunities Program (UROP).
Suggested Citation
Jensen, Claire.
(2018).
Investigating Latencies In Acoustic Selection by Hyla chrysoscelis in the Presence of Informational Masking.
Retrieved from the University of Minnesota Digital Conservancy,
https://hdl.handle.net/11299/201217.