Table 1.

Detailed Layout of Session Structure and Corresponding Analyses: Story and Game Conditions are Counterbalanced

Session Phase	Task	Purpose	Analyses
Story Pre-Test Phase	12 productions of each stimulus item in direct imitation prior to visual referent exposure	Assess kinematic stability and transcription accuracy prior to word learning	STI (kinematic) and PCC (transcription)
Story Exposure Phase	Exposure to the visual referents associated with novel words embedded within a story, followed by traditional word learning measures	Assess fast mapping of novel words using picture referent identification and picture naming tasks	Accuracy in comprehension and production probes
Story Post-Test Phase	12 productions of each stimulus item in direct imitation subsequent to visual referent exposure	Assess kinematic stability and transcription accuracy post initial word learning	STI and PCC
Game Pre-Test Phase	12 productions of each stimulus item in direct imitation prior to visual referent exposure	Assess kinematic stability and transcription accuracy prior to word learning	STI and PCC
Game Exposure Phase	Exposure to the visual referents associated with novel words in a picture-matching game, followed by traditional word learning measures	Assess fast mapping of novel words using picture referent identification and picture naming tasks	Accuracy in comprehension and production probes
Game Post-Test Phase	12 productions of each stimulus item in direct imitation subsequent to visual referent exposure	Assess articulatory stability and accuracy post initial word learning	STI and PCC