| In masked prime paradigm, masked prime can affect the preparation of a motor response to subsequently presented target stimuli.Negative compatibility effect, with performance benefits on incompatible trials and cost on compatible trials, occurs when mask target SOA is 100 to 200ms. Since the negative compatibility effect to be assumed, the research studied has investigated with behavioral, electrophysiological, and functional imaging methods how subliminally presented masked prime stimuli affect subsequently presented stimuli.This effect can be interpreted by three theories:self-inhibition theory, object-updating theory and mask-triggered inhibition theory. Eimer and Schlaghecken pointed self-inhibition theory out that motor activation elicited by a prime is automatically followed by an inhibition phase, leading to inverse priming if three conditions are fulfilled:perceptual evidence for the prime has to be sufficiently strong, it has to be immediately removed by the mask, and the delay between the prime and target has to be long enough for inhibition to become effective. Lleras and Enns pointed object updating theory that negative compatibility effect is triggered by the mask, provided that it contains features calling for the alternative response. Jas'kowski assumed mask triggered inhibition theory that the inhibitory phase is triggered by each successive stimulus which does not support the perceptual hypothesis provided by the prime. All of which probe into one of the essential questions on the mechanism of negative compatibility effect, that is whether it occurs in perception stage or response stage. Klapp once assumed that there were two types of NCE stand for the quarrel of perception and response. That is NCE-P and NCE-NP. This study aims at further exploring the locus of negative compatibility effect through perception and response in isolation.There are three experiments in this study using Arabic digits as follows:the first one is under the condition of the perception interaction of prime and mask, whether the NCE occurs or not, and NCE occurs in the perception or response. The second one on the base of experiment 1,using"##" as mask, aims to explored under no condition of the perception interaction of prime and mask,whether the NCE occurs or not, and NCE occurs in the perception or response. The third one base on the experiment 2 to study whether S-R direct linked is the only one method to trigger NCE.In the condition of the prime and mask have no perception interaction,whether the two way of masked prime activist motor process has effect on the negative compatibility effect.The experiments have several results:In expl,in two condition of the mask, features and task mask condition and task mask condition, the scores of discrimination of prime has no difference with random scores, in features and tasks mask condition, when mask-target SOA longer than 67ms,the RT of similar condition is longer than congruent condition and incongruent condition, and the ER of similar condition is larger than the other, and there is no difference between congruent condition and incongruent condition in RT and ER. In tasks mask condition, in all SOA level, the RT of similar condition is shorter than the other, and the ER of similar condition is smaller than the other. In exp2, the scores of discrimination of prime higher than random scores, in all SOA level, the RT of similar condition is longer than the other, but the ER of three conditions has no rules. According the scores of discrimination of prime, high scores team and low scores team have no difference, and the same as the whole team. In exp3,the scores of discrimination of prime have no difference with random scores, the RT of similar condition is shorter than the other, and the ER of similar condition is smaller than the other in all SOA levels.With the results and discussion in the experiments, we can get the following conclusions:Experiment 1:negative compatibility effect has close relation to prime-target SOA, with performance benefits on incompatible trials in long SOA and cost on compatible trials in short SOA. When prime and mask has perception interaction, compare the positive compatibility effect occurs in the condition of task mask, negative compatibility only occur in the condition of character and task mask, and mayor source of negative compatibility effect is from perception. The experiment support the negative compatibility effect is mainly from perception stage and object updating process is possibly the essential condition of negative compatibility effect. Experiment 2:When prime and mask has no perception interaction, no negative compatibility effect occurs. Experiment 3:When prime and mask has no perception interaction, the masked prime activist the motor process through S-R direct linked, or masked prime activist motor code through motor stage, no negative compatibility effect occurs.All the experiment results assumed that negative compatibility effect is mainly occurs in the perception stage in the masked prime paradigm,and object updating process is mayor reason for negative compatibility effect. |
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