What is the Navon experiment?
Introduction. The Navon task (Navon, 1977) is a well-known letter identification task in which large letters constructed from a number of much smaller letters are presented as stimuli; participants respond to either the large or small letters while ignoring the other type.
What is the Navon paradigm?
To examine this, Navon developed a now classical paradigm, which involved the presentation of compound stimuli; a large letter (global level) composed of smaller letters (local level) in which the global and the local letters could be the same (consistent) or different (inconsistent).
What does Navon task measure?
A Navon figure is made of a larger recognisable shape, such as a letter, composed of copies of a smaller different shape. Navon figures are used in tests of visual neglect. David Navon’s research demonstrated that global features are perceived more quickly than local features.
Is the Navon task reliable?
Importantly, while the face task and both versions of the hierarchical shape task showed moderate-to-high test–retest reliability, the standard Navon letter task showed fairly poor reliability in both studies.
What is the kimchi Palmer task?
To measure this attentional scope, Kimchi and Palmer (1982) developed a task where individuals make similarity judgements. In this task, three global figures (large triangles or squares) each comprised of local elements (small triangles or squares) are presented.
Who invented Navon task?
This specific implementation is designed by PsyToolkit developer Gijsbert Stoet. There are 50 trials. On each trial, you get up to 4 seconds to decide whether you see a target letter (H or O) at the local or global level, or not. On each trial, you need to respond with a key press.
Why is Navon task important?
Navon tasks, therefore, can measure both global and local processing independently (Kinchla & Wolfe, 1979). One focus of research has been to establish how, and indeed whether, people can be categorised as being more inclined towards global or local processing.
How is the Navon task scored?
Navon task interference scores (calculated as the difference in RT between congruent and incongruent conditions) for Low and High trait Anxiety groups, in the A) global task (local interference), and B) local task (global interference).