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2020-09-21

Jenna V. Congdon, Allison H. Hahn, Kimberley A. Campbell, Erin N. Scully, Daniel A. Yip, Erin M. Bayne, Christopher B. Sturdy

Avian predators vary in their degree-of-threat to chickadees; for example, smaller owls and hawks are of higher threat to chickadees as they can easily maneuver through the trees, while larger predators cannot. We conducted an operant go/no-go discrimination task to investigate the effect of...

2016-01-01

Jenna V. Congdon, Allison H. Hahn, Neil McMillan, Marc T. Avey, Christopher B. Sturdy

Chickadees produce many vocalizations, including chick-a-dee calls which they use as a mobbing call in the presence of predators. Previous research has shown that chickadees produce more D notes in their mobbing calls in response to high-threat predators compared to low-threat predators, and may...

2019-05-16

Jenna V. Congdon, Allison H. Hahn, Piera Filippi, Kimberley A. Campbell, John Hoang, Erin N. Scully, Daniel L. Bowling, Stephan A. Reber, Christopher B. Sturdy

Recently, evidence for acoustic universals in vocal communication was found by demonstrating that humans can identify levels of arousal in vocalizations produced by species across three biological classes (Filippi et al., 2017). Here, we extend this work by testing whether two vocal learning...

2016-01-01

Christopher B. Sturdy, Erin N. Scully, Allison H. Hahn, Neil McMillan, Jenna V. Congdon, Kimberley A. Campbell

Category perception, as Herrnstein (1990) defined it, is a powerful and pervasive cognitive ability possessed by every species in which it has been adequately tested. We have studied category perception of vocal communication signals in songbirds for over 20 years. Our first studies provided us...