Alphabetical List | Categorical List
Attention: Neisser 1964
neisser.zip
neisserData.zip
Neisser, U. (1964). Visual search. Scientific American 210(6), 94-102. (pdf)
 
This experiment compares times to find a "Z" in a column of round letters (O, S, Q) vs. a column of angular letters (K, E, L). It predicts that finding an angular letter in a field of round letters would be easier because the distractors have fewer features in common with the target.

The article on which this experiment is based is fairly long and deals with the general concept of visual search (finding a face in a crowd, or a name in a telephone book). The particular part replicated here deals with context effects and effects of position in visual search. It involves a display that is 24 lines long, with 6 letters in each line. The target is the letter "Z". The two factors of interest are whether the letters other than the target resemble it, and where the target is in the display (line 3, 6, 9, 12, 15, 18, 21, or 24). The experiment hopes to show that reaction time varies directly with the position of the item in the display and that finding the target is twice as fast if it does not resemble the distractor letters.

Sample displays, with dissimilar and similar noise:

ODUGQR
QCDUGO
CQOGRD
QUGCDR
URDGQO
GRUQDO
DUZGRO
UCGROD
DQRCGU
QDOCGU
CGUROQ
OCDURQ
UOCGQD
RGQCOU
GRUDQO
GODUCQ
QCURDO
DUCOQG
CGRDQU
UDRCOQ
GQCORU
GOQUCD
GDQUOC
URDCGO
GODRQC
IVMXEW
EWVMIX
EXWMVI
IXEMWV
VXWEMI
MXVEWI
XVWMEI
MWXVIE
VIMEXW
EXVWIM
VWMIEX
VMWIEX
XVWMEI
WXVEMI
XMEWIV
MXIVEW
VEWMIX
EMVXWI
IVWMEX
IEVMWX
WVZMXE
XEMIWV
WXIMEV
EMWIVX
IVEMXW

Treisman and Gelade 1980
none
none
none
Neisser 1964
The factors of interest are the line number of the target and the noise type.
 

13-Mar-2003