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Psychological Research
Gepubliceerd in:

01-11-2008 | Original Article

Object-based selection in the Baylis and Driver (1993) paradigm is subject to space-based attentional modulation

Auteurs: Hermann J. Müller, Rebecca O’Grady, Joseph Krummenacher, Dieter Heller

Gepubliceerd in: Psychological Research | Uitgave 6/2008

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Abstract

Three experiments re-examined Baylis and Driver’s (1993) strong evidence for object-based selection, that making relative apex location judgments is harder between two objects than within a single object, with object (figure-ground) segmentation determined solely by color-based perceptual set. Using variations of the Baylis and Driver paradigm, the experiments replicated a two-object cost. However, they also showed a large part of the two-object cost to be attributable to space-based factors, though there remained an irreducible cost consistent with ‘true’ object-based selection.
vorige artikel The effect of spatial frequency content on parameters of eye movements
volgende artikel The time course of presaccadic attention shifts
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1
Baylis and Driver’s (1993) demonstration of a between-object cost was subsequently challenged by Gibson (1994; see, Fig. 1b), who pointed out an imbalance in contour polarity in the stimuli of Baylis and Driver: full outline convexity for the central object, but only partial convexity for each of the flanking objects. Consequently, the respective descriptions would tend to be parsed differentially as figure and ground, respectively, accounting for the ‘between-object’ cost. Responding to this challenge, Baylis (1994) modified the stimuli to balance the amounts of convexity (and concavity) between within-object and between-object conditions (see the ‘chevron’-type stimuli in Fig. 1c, d, respectively). There remained a between-object cost even with these stimuli. Baylis concluded that both object convexity (Gibson, 1994) and number of objects separately influenced perceptual judgments of the locations of points within objects. Thus, the experiments of Baylis and Driver (1993) and Baylis (1994) appear to offer strong support for object-based selection.
 
2
In Conditions A, B, and C, for between-nonadjacent-object conditions, data from the isolated and isolated-close display conditions were combined in the analyses into the ‘isolated’ display condition, as the respective RTs were equivalent (i.e., identical in Conditions A and B) and there were no differences in error rates > 0.1%.
 
3
A full description of the data of Condition A is given in the Appendix. It is sufficient to note here that the pattern of effects in Condition A is in reasonable agreement with that reported by Baylis and Driver (1993). RTs were fastest for isolated displays, slowest for incongruent displays, and intermediate for joined and congruent displays; and, importantly, RTs were slower for between-object than for within-object displays. The between-object cost tended to be greater for congruent than for incongruent displays, though a differential speed-accuracy trade-off may have concealed a larger cost for incongruent displays.
 
4
Error rates tended to be higher in Condition A than in Conditions B and C: 4.4% vs. 2.3% and 2.2% [F(2,22) = 3.25, MSe = 20.7, P < 0.075], and were higher for incongruent than for congruent and isolated displays: 4.1% vs. 2.6% and 3.0% [F(2,22) = 6.96, MSe = 6.6, P < 0.005). Furthermore, while the error rates did not differ significantly between one-object and two-nonadjacent-object judgments (3.0 vs. 3.5%, averaged across Conditions A, B, and C), they were higher for two-nonadjacent-object than for two-adjacent-object judgments: 2.7 versus 1.4% [F(1,11) = 11.26, MSe = 4.6, P < 0.01].
 
5
The error rates tended to be higher for between-object than for within-object judgments (3.3% vs. 2.1%; F(1,11) = 3.74, MSe = 16.9, P > 0.075), and for incongruent than for congruent displays (2.9 vs. 2.4; F(1,11) = 3.72, MSe = 2.9, P > 0.075).
 
6
The errors rates were higher in Conditions A and D than in Conditions B and C: 2.0% and 1.8 versus 1.0% and 1.0% [F(3,33) = 3.40, MSe = 4.3, P < 0.03], and for between-object than for within-object judgments: 1.8 versus 1.1% [F(1,11) = 4.70, MSe = 3.9, P = 0.053]. The between-object cost increased from Condition B to D (0.1, −0.2, 0.5, and 2.1% for Conditions A, B, C, and D) [F(3,33) = 4.42, MSe = 2.9, P < 0.02].
 
7
Experiment 2 had shown that there is no difference between Experiment 1 Condition B (outline + apex) displays and Experiment 3 Condition B (filled + apex) displays. In Experiment 2, the differential between-object cost between Conditions A and B was larger than in Experiments 1 and 3, but observers were less practiced overall.
 
8
As was correctly pointed out by one of the reviewers, the allocation of spatial attention is supposed to be limited to a single locus in space and, consequently, attention is shifted between locations in a serial fashion. For alternative views based on the assumption of multiple foci of attention, the discussion of which would, however, go beyond the scope of the present study, see, e.g., Bundesen (1990), and Hahn and Kramer (1998) who present experimental evidence in support of multiple attenional foci.
 
9
See Schneider (1993) for proposals on how object- and space-based attention might be integrated functionally.
 
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Metagegevens
Titel
Object-based selection in the Baylis and Driver (1993) paradigm is subject to space-based attentional modulation
Auteurs
Hermann J. Müller
Rebecca O’Grady
Joseph Krummenacher
Dieter Heller
Publicatiedatum
01-11-2008
Uitgeverij
Springer-Verlag
Gepubliceerd in
Psychological Research / Uitgave 6/2008
Print ISSN: 0340-0727
Elektronisch ISSN: 1430-2772
DOI
https://doi.org/10.1007/s00426-008-0172-4

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