Descriptions of variables in file: Autism_fast_mapping_experiment1.csv

Participant_Group:	Indicates whether the participant has autism spectrum disorder (ASD) or is typically developing (TD).

Gender:	Indicates whether the participant is male or female.

CA_Months:		Indicates the participant’s chronological age in months.

CARS2:	Indicates the participant’s raw score on the Childhood Autism Rating Scale Version 2 (Schopler, Van Bourgondien, Wellman, & Love, 2010). Higher scores indicate more severe autism symptoms.

BPVS_AgeEquiv:	Indicates the participant’s receptive vocabulary age equivalent (in months) as measured by the British Picture Vocabulary Scale (Dunn, Dunn, Whetton & Burley, 1997). 

NVIQ: 	Indicates the participant’s nonverbal IQ, as measured by the Leiter-3 (Roid, Miller, Pomplun, & Koch, 2013).

NVIQ_RawScore: 	Indicates the participant’s raw score on the Leiter-3 nonverbal intelligence test. 

WarmUp:	Indicates the participant’s score on the warm up trials for the experimental fast mapping task (the maximum possible score was 3). 

RefSel_Familiar: 	Indicates the participant’s score on ‘familiar’ referent selection trials in the experimental fast mapping task (the maximum possible score was 4).

RefSel_Novel:	Indicates the participant’s score on ‘novel’ referent selection trials in the experimental fast mapping task (the maximum possible score was 4).

Retention_Total:	Indicates the participant’s score on ‘retention’ test trials in the experimental fast mapping task (the maximum possible score was 8).

Generalisation_Total:	Indicates the participant’s score on ‘generalisation’ test trials in the experimental fast mapping task (the maximum possible score was 8).

Gen_ColourErrors:	Indicates the number of trials on which children selected the ‘colour match’ object on ‘generalisation’ test trials in the experimental fast mapping task (the maximum possible score was 8).

Descriptions of variables in file: Autism_fast_mapping_experiment2.csv

Participant_Group:	Indicates whether the participant has autism spectrum disorder (ASD) or is typically developing (TD).

Gender:	Indicates whether the participant is male or female.

EXP_Condition:		Indicates whether the participant was allocated to the ‘Social’ reinforcement 			condition or the ‘Non-Social’ reinforcement condition.

CA_Months:		Indicates the participant’s chronological age in months.

CARS2:	Indicates the participant’s raw score on the Childhood Autism Rating Scale Version 2 (Schopler, Van Bourgondien, Wellman, & Love, 2010). Higher scores indicate more severe autism symptoms.

BPVS_AgeEquiv:	Indicates the participant’s receptive vocabulary age equivalent (in months) as measured by the British Picture Vocabulary Scale (Dunn, Dunn, Whetton & Burley, 1997). 

NVIQ: 	Indicates the participant’s nonverbal IQ, as measured by the Leiter-3 (Roid, Miller, Pomplun, & Koch, 2013).

NVIQ_RawScore: 	Indicates the participant’s raw score on the Leiter-3 nonverbal intelligence test. 

WarmUp:	Indicates the participant’s score on the warm up trials for the experimental fast mapping task (the maximum possible score was 3). 

RefSel_Familiar: 	Indicates the participant’s score on ‘familiar’ referent selection trials in the experimental fast mapping task (the maximum possible score was 4).

RefSel_Novel:	Indicates the participant’s score on ‘novel’ referent selection trials in the experimental fast mapping task (the maximum possible score was 4).

Retention_Total:	Indicates the participant’s score on ‘retention’ test trials in the experimental fast mapping task (the maximum possible score was 8).

Generalisation_Total:	Indicates the participant’s score on ‘generalisation’ test trials in the experimental fast mapping task (the maximum possible score was 8).

Gen_ColourErrors:	Indicates the number of trials on which children selected the ‘colour match’ object on ‘generalisation’ test trials in the experimental fast mapping task (the maximum possible score was 8).