Publications by authors named "U Langemann"
Article Synopsis
- The study examines how chickens localize sound, focusing on which cues they use.
- Sound localization was measured using minimal audible angles (MAA) at different frequencies, revealing strong acuity in chickens.
- It was found that at lower frequencies (500 and 1000 Hz), chickens mainly use interaural time differences, while at higher frequencies (2000 and 4000 Hz), they likely rely more on interaural level differences.
Article Synopsis
- Interaural time differences (ITD) and interaural level differences (ILD) are key auditory cues that help locate sound sources, which is vital for communication and survival.
- The barn owl exhibits superior sound localization abilities, often studied through reflexive responses focused on higher frequencies (above 3 kHz).
- A Go/NoGo experiment revealed that the barn owl's Minimum Audible Angle (MAA) improves with higher frequencies and is smaller for frontal sounds compared to lateral ones, indicating better auditory acuity in those scenarios.
Article Synopsis
- The study assessed auditory sensitivity in barn owls using a Go/NoGo test with two age groups: under 2 years and over 13 years.
- Average hearing thresholds were below 0 dB SPL for 1-10 kHz frequencies, with the lowest mean threshold at -12.6 dB SPL at 8 kHz, while 12 kHz had the highest mean threshold (31.7 dB SPL).
- Age group did not significantly affect auditory thresholds, and a 23-year-old individual showed only minor threshold increases over 21 years, suggesting birds may have better resistance to age-related hearing loss compared to other species.
Barn owls are keen hunters of moving prey. They have evolved an auditory system with impressive anatomical and physiological specializations for localizing their prey. Here we present behavioural data on the owl's sensitivity for discriminating acoustic motion direction in azimuth that, for the first time, allow a direct comparison of neuronal and perceptual sensitivity for acoustic motion in the same model species.
View Article and Find Full Text PDFDuring the transmission of acoustic signals, the spectral and temporal properties of the original signal are degraded, and with increasing distance more and more echo patterns are imposed. It is well known that these physical alterations provide useful cues to assess the distance of a sound source. Previous studies in birds have shown that birds employ the degree of degradation of a signal to estimate the distance of another singing male (referred to as ranging).
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