By Mark A. Bee, Cory T. Miller
This e-book analyzes the mental mechanisms severe to animal communique. the subjects lined diversity from unmarried neurons to broad-scale phylogenetic styles, laying off new gentle at the sensory, perceptual, and cognitive approaches that underlie the communicative behaviors of signalers and receivers alike. In so doing, the contributing authors jointly combine examine questions and strategies from behavioral ecology, cognitive ethology, comparative psychology, evolutionary biology, sensory ecology, and neuroscience. No much less large is the volume’s taxonomic assurance, which spans bees to blackbirds to baboons. the final word objective of the publication is to stimulate extra examine into the range and evolution of the mental mechanisms that make animal communique attainable.
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Extra resources for Psychological Mechanisms in Animal Communication
More recently, studies using AEPs to measure peripheral auditory processing have also shown correlations between frequency sensitivity and spectral vocal content. Henry and Lucas (2008) showed that tufted titmice (Baeolophus bicolor), house sparrows (Passer domesticus), and white-breasted nuthatches (Sitta carolinensis) have similar hearing thresholds for sounds with frequencies below 4 kHz (Fig. 4). 4 kHz were 12–14 dB lower (more sensitive) in tufted titmice than the other three species. These results were interpreted as an adaptation for processing high-frequency alarm calls present in the vocal repertoire of tufted titmice.
2 Estimation of auditory filter bandwidth from tone-evoked ABRs in notched masking noise (from Henry and Lucas 2010a [Fig. 1]). The frequency of tone stimuli was 3 kHz. (a) ABR amplitude (normalized) plotted as a function of stimulus level at five different notch bandwidths [nw (right); expressed as the bandwidth in Hz divided by twice the center frequency of the notch (2 Â 3 kHz)]. ABRs were recorded from a tufted titmouse (Baeolophus bicolor). Solid lines show the fit of a generalized linear model used for estimation of ABR thresholds.
Henry and Lucas (2009) next investigated frequency sensitivity in the house sparrow. They found that while the amplitude of ABRs to tone burst stimuli showed seasonal plasticity, there was no variation in ABR-based absolute thresholds (the audiogram) or the latency of the ABR response. 4 kHz were greater in the spring than in the fall (Fig. 6). Again, these results mirror the initial findings of Lucas et al. (2002), with amplitude of the responses increasing during the spring months, when house sparrows are in reproductive condition.