Experimental design
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Experiment 1 |
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| Group |
Acquisition Cxa |
Acquisition Test Cxa |
Acquisition′ Cxa |
Transfer Acquisition Test Cxa/b |
Extinction Cxa/b |
Extinction Test Cxa/b |
Transfer Extinction Test Cxa |
| aaa | In Cx a | In Cx a | In Cx a | ||||
| 12 X→A+, | 4 X→A+, | X→A-, A-, X-, | 20 X→A- | X→A-, A-, X-, | |||
| 3 X→A-, | 1 X→A-, | Y→B-, B-, Y- | 20 Y- | Y→B-, B-, Y-, | X→A-, A-, X-, | ||
| 15 A-, | X→A-, A-, X-, | 5 A-, | (2 blocks) | X→B-, Y→A- | Y→B-, B-, Y-, | ||
| aba | 12 Y→B+, | Y→B-, B-, Y- | 4 Y→B+, | In Cx b | In Cx b | In Cx b | X→B-, Y→A- |
| 3 Y→B-, | 1 Y→B-, | X→A-, A-, X-, | 20 X→A- | X→A-, A-, X-, | |||
| 15 B- | 5 B- | Y→B-, B-, Y- | 20 Y- | Y→B-, B-, Y-, | |||
| (2 blocks) | X→B-, Y→A- |
| Experiment 2 |
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| Group |
Acquisition Cxa |
Acquisition Test Cxa |
Acquisition′ Cxa |
Transfer Acquisition Test Cxb |
Extinction Cxb |
Extinction Test Cxb |
Transfer Extinction Test Cxa |
| Control | |||||||
| 12 X→A+, | 4 X→A+, | 20 X | |||||
| 3 X→A-, | 1 X→A-, | X→A-, A-, X-, | 8 Y→B+, | X→A-, A-, X-, | X→A-, A-, X-, | ||
| 15 A-, | X→A-, A-, X-, | 5 A-, | Y→B-, B-, Y- | 8 B- | Y→B-, B-, Y-, | Y→B-, B-, Y-, | |
| Extinction | 12 Y→B+, | Y→B-, B-, Y- | 4 Y→B+, | (2 blocks) | X→B-, Y→A- | X→B-, Y→A- | |
| 3 Y→B-, | 1 Y→B-, | 20 X→A-, | |||||
| 15 B- | 5 B- | 8 Y→B+, | |||||
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8 B-
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For half of the participants in each group, stimuli X and Y are (counterbalanced) a 1.5-sec presentation of a complex sound pattern1 and a 1.5-sec presentation of another complex sound pattern2, whereas stimulis A and B are (counterbalanced) a 1.5-sec full-screen presentation of a marble green background pattern and a 1.5-sec presentation of a brown-golden background pattern. For the other half of the participants in each group, the visual stimuli functioned as features X and Y, whereas the auditory stimuli were the targets A and B. An “→” sign denotes a sequential presentation of the feature and the target stimuli (interstimulus interval 1.5 sec. A “+” sign represents a reinforced trial (0.5-sec white flashing screen plus complex sound pattern 3), and a “–” sign represents an unreinforced trial. At Test moments, the critical test stimuli are presented for 3 sec rather than for 1.5 sec. Cx a and Cx b were the two different contexts in which the Martians appeared (vertical or horizontal, counterbalanced).
