DOI: 10.5061/dryad.dfn2z357j
title: Data from: Behavioral and neural measures of confidence using a novel auditory pitch identification task

description: Observers can discriminate between correct versus incorrect perceptual
 decisions with feelings of confidence. The centro-parietal
 positivity build-up rate (CPP slope) has been suggested as
 a likely neural signature of accumulated evidence, which may
 guide both perceptual performance and confidence. However, CPP slope also
 covaries with reaction time, which also covaries with confidence in
 previous studies, and performance and confidence typically covary; thus,
 CPP slope may index signatures of perceptual performance rather than
 confidence per se. Moreover, perceptual metacognition – including neural
 correlates – has largely been studied in vision, with few exceptions.
 Thus, we lack understanding of domain-general neural signatures of
 perceptual metacognition outside vision. Here we designed a novel auditory
 pitch identification task and collected behavior with
 simultaneous 32-channel EEG in healthy adults. Participants saw two tone
 labels which varied in tonal distance on each trial (e.g., C vs D, C vs
 F), then heard a single auditory tone; they identified which
 label was correct and rated confidence. We found that pitch identification
 confidence varied with tonal distance, but performance, metacognitive
 sensitivity (trial-by-trial covariation of confidence with accuracy), and
 reaction time did not. Interestingly, however, while CPP slope covaried
 with performance and reaction time, it did not significantly covary with
 confidence. We interpret these results to mean that CPP slope is likely a
 signature of first-order perceptual processing and not confidence-specific
 signals or computations in auditory tasks. Our novel pitch identification
 task offers a valuable method to examine the neural correlates of
 auditory and domain-general perceptual confidence.
description: 32-channel EEG data (Ag/AgCl) were recorded using a BrainVision
 ActiCap system (Brain Products GmbH, Munich, Germany) via the BrainVision
 Recorder software (Version 1.21.0303, Brain Products GmbH, Munich,
 Germany) at 500 Hz sampling frequency. All electrodes were mounted in an
 elastic cap according to the international 10/20 system (Oostenveld
 & Praamstra, 2001), and were grounded with a forehead ground and
 online referenced to Cz. Impedances were kept below 20 kΩ on average, and
 an antialiasing low-pass fi2lter of 245 Hz was applied via an ActiCHamp
 amplifier (Brain Products GmbH, Munich, Germany). Conductive gel was
 applied to maintain the contact between the electrodes and the scalp.
 Event and response triggers were synchronized with the recorded EEG signal
 via TTL signals sent through the VPixx DATAPixx system.
description: # Data from: Behavioral and neural measures of confidence using a novel
 auditory pitch identification task --- Behavioral data and 32-channel EEG
 recording for 17 subjects performing an auditory pitch identification +
 confidence judgment task. ## Description of the data and file structure
 AP_data_raw.mat is a Matlab data file contains the following structure
 types: ### Behavioral data * behavData is a 1x17 cell array containing
 trial order and subject response data, with one cell per subject ### EEG
 data Preprocessing was accomplished using the methods described in the
 linked publication. * EEG = 1x17 is a struct containing preprocessed,
 epoched stimulus-locked EEG data for each subject * EEG_rl = 1x17 is a
 struct containing preprocessed, epoched response-locked EEG data for each
 subject ## Sharing/Access information Anonymized data are available from
 this Dryad repository.