forced choice preferential looking
Behavioral testing method using preferential looking to assess visual acuity and function in preverbal children.
Full Definition
Forced choice preferential looking (FPL) is a psychophysical testing technique used to evaluate visual function in infants and young children who cannot provide verbal responses. The method presents the child with two stimuli simultaneously - one containing a visual pattern (such as gratings or optotypes) and one blank - while an observer judges which stimulus the child prefers to look at. The technique exploits the natural tendency of infants to prefer patterned stimuli over uniform fields. FPL can assess visual acuity, contrast sensitivity, and other visual functions. It requires careful control of testing conditions and trained observers to avoid bias. The method is particularly valuable for evaluating vision in children with developmental delays or neurological conditions.
Usage
Usage note: Specify testing conditions and observer bias controls; may be abbreviated as FPL.
In Context
- "Forced choice preferential looking revealed visual acuity of 20/200 in this 18-month-old with developmental delays." — Behavioral vision assessment
- "The FPL protocol was modified to accommodate the child's attention span and cooperation level." — Testing adaptation note