  The ease of in-the-wild speech recording using smartphones has sparked
considerable interest in the combined application of speech, remote measurement
technology (RMT) and advanced analytics as a research and healthcare tool. For
this to be realised, feasibility must be established not only from an
analytical perspective, but also the acceptability of the approach to the user.
To understand the acceptance, facilitators and barriers of smartphone-based
speech recording, we invited 384 individuals with major depressive disorder
(MDD) from the Remote Assessment of Disease and Relapse - Central Nervous
System (RADAR-CNS) research programme in Spain and the UK to complete a survey
on their experiences recording their speech. In this analysis, we demonstrate
that study participants were more comfortable completing a scripted speech task
than a free speech task. For both speech tasks, we found depression severity
and country to be significant predictors of comfort. Not seeing smartphone
notifications of the scheduled speech tasks, low mood and forgetfulness were
the most commonly reported obstacles to providing speech recordings.
