Repetition blindness

Repetition blindness (RB) is a phenomenon observed in rapid serial visual presentation. People are sometimes poor at recognizing when things happen twice. Repetition blindness is the failure to recognize a second happening of a visual display. The two displays are shortly shown usually for about 150 milliseconds, and then they are shown within 500 milliseconds of each other (Kanwisher, 1987).[1] Repetition blindness tasks usually are words in lists and in sentences. They are called phonologically similar items (Bavelier & Potter, 1992).[2] There are also pictures, and words that include pictures. An example of this is a picture of the sun and the word sun (Bavelier, 1994).[3] The most popular task used to examine repetition blindness is to show words one after another on a screen fast in which participants must recall the words that they saw. This task is known as the rapid serial visual presentation (RSVP). Repetition blindness is present if missing the second word creates an inaccurate sentence. An example of this is "When she spilled the ink there was ink all over.” An RSVP sequence participants will recall seeing "When she spilled the ink there was all over." However, they are missing the second occurrence of "ink" (Kanwisher, 1987). This finding supports that people are "blind" for the second occurrence of a repetitive item in an RSVP series. For example, a subject's chances of correctly reporting both appearances of the word "cat" in the RSVP stream "dog mouse cat elephant cat snake" are lower than their chances of reporting the third and fifth words in the stream "dog mouse cat elephant pig snake".

The precise mechanism underlying RB has been extensively debated. Nancy Kanwisher has argued that it involves failure to tokenize the second appearance of a repeated stimulus, leading to the second appearance being dropped from short term memory before it can be reported. However, Whittlesea and colleagues have argued that repetition blindness arises from a failure to properly reconstruct the list, both online and post list. This failure to properly reconstruct the list arises from the poor encoding cues that are the result of the RSVP task.

See also

References

  1. ↑ Kanwisher, N (1987). "Repetition blindness: Type recognition without token individuation". Cognition. 27: 117–143. PMID 3691023. doi:10.1016/0010-0277(87)90016-3.
  2. ↑ Bavelier, D; Potter, M (1992). "Visual and phonological codes in repetition blindness". Journal of Experimental Psychology: Human Perception & Performance.
  3. ↑ Bavelier, D (1994). "Repetition blindness between visually different items: The case of pictures and words". Cognition. 51 (3): 199–236. doi:10.1016/0010-0277(94)90054-x.
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