Each mother-infant pair was recorded in their home during approximately 14 sessions lasting 1.5 to 2 hours each. Sessions were separated by approximately 2 weeks during the period when the child was between 9 and 15 months old. The mother and child were left alone during the recording session. The middle 75 minutes of each session were extracted, digitized, and transcribed. Some details of the methods can be found in our paper:
Brent, M. R. & Siskind, J. M (2001). The role of exposure to isolated words in early vocabulary development. Cognition, 81, 31-44. (abstract, full-text)
If you use our data, please cite that paper. Thank you!
|Pro Audio DAT Recorder||Sony TCDD8||Official Product Site|
|Body Microphone||Sony ECMT140||Company Homepage|
|Digital I/O Adapter||Sony RMRD100||Company Homepage|
|Break Out Box and PCI Interface||Delta 66 24 Bit/96 kHz PCI||Unofficial Site|
|Sound Forge XP||Version 4.5||Official Product Site|
|Dynamic Headphones||Sennheiser HD545||Official Product Site|
|RedHat Linux||Version 6.2||Company Homepage|
|Segmentation Editor*||Version 1.27||Custom Developed Software: See Description Below*|
* Segmentation-editor is software we developed for transcribing our recorded audio files of mothers speaking to their children. It provides a graphical interface for the transciber to enter text and align that text with it's corresponding sound in the audio file. It outputs the transciption into a chat (.cha) file, which follows the CHILDES standard. It also checks all text for spelling and valid chat syntax. The program was written in Scheme and includes some C++ components. Currently, it only runs on RedHat Linux. If you would like a copy of the executable or source code, please contact Michael Brent . THIS SOFTWARE COMES WITH ABSOLUTELY NO WARANTEE OR SUPPORT!