Local and global visual mechanisms underlying individual differences in the rod-and-frame illusion

Donatella Spinelli, Donatella Spinelli, Gabriella Antonucci, Roberta Daini, Pierluigi Zoccolotti

Research output: Contribution to journalArticle

Abstract

The role of local and global visual mechanisms in individual differences in the rod-and-frame (RF) effect was investigated. Field-dependent and field-independent observers, selected on the basis of Witkin and Asch's (1948) classical procedure, were submitted to the small RF test (Coren & Hoy, 1986). Four frame tilts and two gap sizes were used. As expected, direct effects (i.e., rod settings in the direction of frame tilt) were observed at small degrees of frame tilt, while indirect effects (i.e., rod settings in the direction opposite that of frame tilt) were observed at larger frame tilts. Fielddependent observers showed larger direct effects in the case of the small gap. Indirect effects were comparable in both field-dependent and field-independent subjects, regardless of gap size. Following the model proposed by Wenderoth and Johnstone (1987), these findings indicate that low-level visual mechanisms, responsible for local orientation interactions, have a different gain in fielddependent and field-independent individuals. In contrast, global visual mechanisms, presumably acting

Original languageEnglish
Pages (from-to)915-920
Number of pages6
JournalPerception and Psychophysics
Volume57
Issue number6
DOIs
Publication statusPublished - Jan 1995

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Sensory Systems
  • Psychology(all)

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