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Visual search for letters and words in letter arrays: performance and eye movements

Автор
Фаликман Мария Вячеславовна
 
Соавторы
Sergey Yazykov
 
Тип публикации
Опубликованные тезисы конференций
 
Язык публикации
Русский
 
Аффилиация
МГУ имени М.В. Ломоносова, НИУ ВШЭ, РАНХиГС
 
Издательство
Abstracts of the 57th Conference of Experimental Psychologists, Lengerich, Germany: Pabst Science Publ.
 
Год
2015
 
Количество страниц
1
 

Аннотация
In visual search among complex stimuli, one of the most important issues is the problem of chunking. In our experiments, we studied visual search for letters in letter arrays, using a modified selective attention test. Observers searched for a prespecified letter in an array of random letters which included words. Target letters were either always or never embedded in those words. In the control condition, there were no words in the array. We discovered a dissociation of letter search efficiency (no statistically significant differences between the three conditions) and subjective representation of one's performance (drastic differences between the two experimental conditions). To understand this dissociation, we compared time-limited search for prespecified letters and search for words in the same letter arrays combining behavioral data and eyetracking. Search efficiency differed in the two conditions: letter search proved much easier than word search (mean search performance was 75% for letters and 46% for words). The pattern of fixations also differed: when searching for words, observers performed more fixations both between and within words. At the same time, almost all participants who searched for letters noticed words in letter strings. Thus, automatic word segregation is possible, but task-driven chunking is a resource-consuming operation.

Ключевые слова
attention, visual search

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