Response selection processes for conjunctive targets.
A model is proposed for identification and response selection of cross-dimensional conjunctive stimuli. The model assumes that the formation of conjunction representations involves processes similar to those used in response selection for single-feature targets. It predicts that discrimination between conjunctive targets leads to separate competitions in each of the relevant component dimensions and that detection of a predefined single conjunctive target is done at the conjunctive map level. Experiments 1 and 2 support these two sets of predictions. Experiment 3 demonstrates that responses to conjunctions of features within the orientation dimension are qualitatively different from those for cross-dimensional conjunctive targets. It is speculated that line-orientation conjunctions are handled by the visual object-recognition system, whereas cross-dimensional conjunctions, as exemplified by the model, may be performed by a different system that is closely associated with response selection processes.
Cohen
A
A
Department of Psychology, Hebrew University, Jerusalem, Israel. msasher@mscc.huji.ac.il
Shoup
R
R
D000328:Adult; D000704:Analysis of Variance; D001288:Attention; D003463:Cues; D005260:Female; D006801:Humans; D008297:Male; D008960:Models, Psychological; D010470:Perceptual Masking; D011597:Psychomotor Performance; D011930:Reaction Time; D017603:Signal Detection, Psychological; D013028:Space Perception; D014796:Visual Perception