iSAT於年輕成人之心理計量特性驗證 (1013 renew)

Validation of psychometric properties of an iPad-based Selective Attention Test in young adults 

N=54 (M=28, F=26) mean age=24.4 years; mean education years=16.1 years

1. Test-retest reliability, random measurement error and practice effect: 
(1) Moderate test-retest reliability for all 4 indices
(2) Acceptable random measurement error for the L and LD indices
     Substantial random measurement error for the H and HD indices
(3) Small to moderate practice effect for the L and LD indices
      Moderate to high practice effect for the H and HD indices

Indices	ICC (95% CI)	SEM (SEM%)	MDC (MDC%)	Effect size (s: significant; ns: not significant)
Low load (L)	0.65 (0.44-0.78)	0.04 (6.6%)	0.12 (18.4%)	0.25 (s)
Low load with Distractor (LD)	0.53 (0.30-0.70)	0.05 (8.2%)	0.15 (22.6%)	0.32 (s)
High load (H)	0.58 (0.02-0.81)	0.20 (12.0%)	0.56 (33.2%)	0.70 (s)
High load with Distractor (HD)	0.59 (0.24-0.78)	0.23 (13.2%)	0.62 (36.6%)	0.55 (s)

2. Convergent validity: 
Correlation with T-SDMT: acceptable

L	H	HD
r=0.30	r=0.40	r=0.46

3. Discriminative validity: Yes

For all 4 indices, the scores of participants with scores higher than the highest 25% of data were significantly different than those of participants with scores lower than the lowest 25% of data (p<0.001). 

4. Construct validity: not fitting with perceptual load theory
The results of the iSAT in young adults did not confirm the hypothesis of perceptual load theory.