Auditory Ensembles Analysis
Jonathan Keefe
11 February 2021
Paradigm and Hypotheses
This document plots the results of a 30 min version of Auditory Ensembles. In this task, subjects performed an auditory memory task in which they remembered a single pure tone (300 ms duration) over a delay with distractors. Subjects remembered the first tone of the presentation, which was then followed by 4 pure tone distractors after a 900 ms ISI. Each of these distractor tones had an ISI of 300 ms. The tones were either +/-1, 3, or 5 semitones from the remembered tone and were chosen such that their average pitch was either equal to, higher than, or lower than the to-be-remembered tone with equal probability. Following the final distractor tone, there was a 2 sec delay. Participants then reported which of two test tones they heard at the beginning of the trial (i.e. 2IFC) using the f and j keys. We designed the task to see if ensemble information biases individual auditory memory representations. We hypothesized that subjects would be more likely to pick foils when they were in the same direction from the remembered tone as the ensemble (i.e. less accurate in task), and less likely to pick foils when they were in the opposite direction from the remembered tone as the ensemble (i.e. more accurate).
Note: No error bars yet! Subjects who had a d’ of less than .5 after collapsing across all conditions were excluded.
Subjects’ (N = 1) overall performance, before exclusion
Subjects’ (N = 1) performance on task, after exclusion
Target discrimination d’
Target discrimination RT
