Auditory "Object" perception in pigeons (Columba livia)
Abstract: Separating auditory signal from noise is necessary for survival (e.g., discerning a hawk's cry from a brook's roar). Previous research suggests that auditory object perception is based on temporal features of a single stimulus and across the auditory stimuli within close temporal proximity (i.e., trial). To understand time's influence on auditory grouping, pigeons were tested in an audit... read moreory same-different go/no-go task. Pigeons were trained to peck if sounds in a series were different (S +) and suppress pecks if a sound repeated (S -). Experiment 1 varied the sound's presentation rate and revealed that pigeons did not change their peck rates when the tempo changed. Experiment 2 changed the local sequence by presenting the same sounds forward and reversed, but found no change to discrimination. Experiment 3 divided sounds into equal parts and scrambled the parts to create a new order. Scrambling had no effect on discrimination. These results suggest pigeons use one or multiple time-invariant auditory features to solve a same-different discrimination.
Thesis (M.S.)--Tufts University, 2018.
Submitted to the Dept. of Psychology.
Advisor: Robert Cook.
Committee: Anniruddh Patel, and Brett Gibson.
Keyword: Cognitive psychology.read less