Appendix.

Sample story episode.

	Story 1		Story 2
Episode 1	Scene]	Narrative	Scene	Narrative
Scene 1	Girl monster character    sitting on floor next to    couch crying. Boy monster    character standing next to    couch.	Mom and dad were at work.    Big Brother had to take care    of Little Sister. Little Sister    was crying. “I’ll take you to    the park if you stop crying,”    said Big Brother.	Girl crocodile character    talking and boy crocodile    character listening.	Mary and Joe crocodile had    to go to school. Today was    a big day. It was show and    tell day. Mary and Joe were    looking for things to bring.
Scene 2	Boy character dancing    with red candy + 1 chute    in thought cloud. Girl    character dancing with blue    candy + 2 chutes in thought    cloud.	“We can go to the candy    machines at the park,” said    Big Brother. “My favorite    is the /fa℧g/.” Little Sister    said, “My favorite is the    /pim/.”	Girl character dancing with    yellow candy + 1 chute    in thought cloud. Boy    character dancing with    green candy + 1 chute in    thought cloud.	“We can stop at the candy    machines on the way to    school,” said Mary. “My    favorite is the /jeIm/” Joe    said, “My favorite is the    /hαn/.
Scene 3	Boy character standing    and holding punch toy.    Girl character sitting and    holding cork gun.	“Can we bring some toys?” asked    Little Sister.“Yes”    said Big Brother. “I’m    bringing my /nεp/.” Little Sister    said, “I’m bringing my    /jΛd/.	Girl character standing and    holding punch arrow. Boy    character standing and    holding marshmallow    sprayer.	“Can we bring some toys?”    asked Joe. “Yes,” said Mary    “I’m bringing my /jo℧n/.”    Joe said, “I’m bringing my /feIg/.”
Scene 4	Boy character standing    blowing on orange trumpet    with bell pointing down. Girl    character in profle blowing    on yellow hand-held tuba.	“We can play music at the    park,” said Big Brother. “I’m    taking my /jIb/.” Little Sister    said, “I’m taking my /hif/.”	Girl character in profle    blowing on red saxophone    pointing down. Boy    character in profle blowing    blue oboe pointing up.	“We can play music at show    and tell,” said Mary. “I’m    taking my /mεk/.” Joe said    “I’m taking my /wαf/.”
Scene 5	Boy character walking green    gerbil with antenna on    a leash. Girl character    carrying purple mouse-bat.	“What about the pets?” asked    Little Sister. “We’ll take    them with us,” said Big    Brother. “I’ll get /paib/.”    Little Sister said, “I’ll get    /wæd/.”	Girl character holding yellow    frog bat. Boy character    walking orange elephant-    mouse on leash.	“Can we bring our pets?”    asked Joe. “Sure,” said    Mary. “I’ll get /mug/.” Joe    said, “I’ll get /na℧t/.”
Scene 6	Boy and girl characters    running down a sidewalk with    arms in the air.	“Let’s go!” said Big Brother.    “Yea!” said Little Sister    They ran all the way to the    park. What will they do at    the park?	Boy and girl character seated    in a car with father character    driving.	“Let’s go!” said Mary. “Yea!”    said Joe. They climbed in    the car to go to school    What will the other kids    think of their stuff?

There were three additional alternative versions of this story episode to achieve counterbalancing in pairing nonwords with referents across participants. In addition, the order of presentation of Scenes 2–5 was randomized across participants.