CSC Deceptive Speech

Item Name: CSC Deceptive Speech
Author(s): Columbia University, SRI International, University of Colorado Boulder
LDC Catalog No.: LDC2013S09
ISBN: 1-58563-660-6
ISLRN: 030-491-638-667-9
Release Date: November 15, 2013
Member Year(s): 2013
DCMI Type(s): Sound
Sample Type: pcm
Sample Rate: 16000
Data Source(s): microphone conversation
Application(s): speech recognition, anomaly analysis
Language(s): English
Language ID(s): eng
License(s): CSC Deceptive Speech
Online Documentation: LDC2013S09 Documents
Licensing Instructions: Subscription & Standard Members, and Non-Members
Citation: Columbia University, SRI International, and University of Colorado Boulder. CSC Deceptive Speech LDC2013S09. Web Download. Philadelphia: Linguistic Data Consortium, 2013.
Related Works: View


CSC Deceptive Speech was developed by Columbia University, SRI International and University of Colorado Boulder. It consists of 32 hours of audio interviews from 32 native speakers of Standard American English (16 male,16 female) recruited from the Columbia University student population and the community. The purpose of the study was to distinguish deceptive speech from non-deceptive speech using machine learning techniques on extracted features from the corpus.

The participants were told that they were participating in a communication experiment which sought to identify people who fit the profile of the top entrepreneurs in America. To this end, the participants performed tasks and answered questions in six areas. They were later told that they had received low scores in some of those areas and did not fit the profile. The subjects then participated in an interview where they were told to convince the interviewer that they had actually achieved high scores in all areas and that they did indeed fit the profile. The task of the interviewer was to determine how he thought the subjects had actually performed, and he was allowed to ask them any questions other than those that were part of the performed tasks. For each question from the interviewer, subjects were asked to indicate whether the reply was true or contained any false information by pressing one of two pedals hidden from the interviewer under a table.


Interviews were conducted in a double-walled sound booth and recorded to digital audio tape on two channels using Crown CM311A Differoid headworn close-talking microphones, then downsampled to 16kHz before processing.

The interviews were orthographically transcribed by hand using the NIST EARS transcription guidelines. Labels for local lies were obtained automatically from the pedal-press data and hand-corrected for alignment, and labels for global lies were annotated during transcription based on the known scores of the subjects versus their reported scores. The orthographic transcription was force-aligned using the SRI telephone speech recognizer adapted for full-bandwidth recordings. There are several segmentations associated with the corpus: the implicit segmentation of the pedal presses, derived semi-automatically sentence-like units (EARS SLASH-UNITS or SUs) which were hand labeled, intonational phrase units and the units corresponding to each topic of the interview.

Transcript files are in .trs format and audio files are .wav presented in flac-compressed form for this release.


Please view these audio and transcript samples for the interviewer side of a conversation..


On May 22, 2014 an additional documentation file was added to explain the questions  participants were asked.

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