AUTHOR=Thomas Hoben , Fassbender Ina 

TITLE=Modeling Infant i's Look on Trial t: Race-Face Preference Depends on i's Looking Style

JOURNAL=Frontiers in Psychology

VOLUME=Volume 8 - 2017

YEAR=2017

URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2017.01016

DOI=10.3389/fpsyg.2017.01016

ISSN=1664-1078

ABSTRACT=\begin{abstract} When employing {\it between-infant} designs
young infants' looking style (LS) is related to their 
development: Short looking (SL) infants are cognitively accelerated over their long looking (LL) peers. In fact,  
 LS is a 
{\it within-infant} variable, and depends on infant $i$'s look distribution
over trials.  For the paired array setting, a model is provided which  specifies the 
probability, $\pi_i\in [0,1]$, that $i$ is SL. 
The  model is employed in a 
face preference study;  
74 Caucasian infants were 
longitudinally assessed  at
3, 6 and 9 months. Each $i$ viewed 
same race (Caucasian) versus other race (African) faces. Infants become
SL with development, but there are  
huge individual differences in rate of change over age.   
Three month LL infants, $\hat\pi_{i}<1/2$,
preferred other race faces. 
SL infants, $\hat\pi_{i}>1/2$,
preferring same
race faces at 3, and other race faces at 6 and 9 months. LS changes precede and
may control changes in face preference.
Ignoring  LS can be misleading:  Without considering  LS,  three  month infants show no face preference.
              \end{abstract}