dopOSCCI Functional Transcranial Doppler Summary Suite We have developed a functional Transcranial Doppler summary software package based on the methods developed by Michael Deppe (Deppe, Knecht, Henningsen, & Ringelstein, 1997; Deppe, Knecht, Lohmann, & Ringelstein, 2004a). ‘dopOSCCI’ is an amalgamation of ‘doppler’ and 'OSCCI', the name of our research group, the Oxford Study of Children's Communication Impairments. The software has been developed in order to overcome some difficulties we had with establishing trial event markers as well as the repetitive process of single file data processing. dopOSCCI processes multiple raw .TX and .TW files from the Multi-dop system and now supports .EXP files from the Doppler Box system. It searches for these within a specified folder, performs raw data processing (down- sampling, heart rate correction, and normalisation), calculates a series of summary statistics for sets of epochs which are saved into a tab-delimited file (easily accessed with SPSS or Excel), and also creates a selectable set of figures which can also be saved for later inspection. A series of additional features also allows for manual epoch screening, group summaries, behavioural epoch selection (summaries by experimental conditions or behavioural performance), and session combination (combining independent raw Doppler files). We have found that dopOSCCI is a useful tool for quickly and easily exploring and summarising Doppler data. The manual provides an overview of the graphical user interface (gui) in Matlab as well as the data summaries which are created. The software was written in Matlab version 7.9.0.529 (2009b) in a Windows XP operating system. It has been tested in 2010 Matlab versions as well as in Windows Vista and 7. dopOSCCI is distributed under the GNU Public License for non-commercial use and open source development.