Observation And Regression Analysis

Introduction
Searching objects by visual, like searching a mobile on a workdesk full of clutter, searching a friend in a busy railway station, are frequent tasks in our daily life. As the high demands of this function, realizing what factors influence the performance and how affect it become a question for researchers. There are different points of views in perceiving an object. Gestalt psychologists asserted that we perceive the whole object first and analyze the details, like components, later. However, Associationists claimed that entirety is constructed by integrating elementary sensations. The dispute between both advocates was lasting for many years. (Monahan & Lockhead, 1977; Neisser, 1977). Meanwhile, Treisman, Sykes, & Gelade (1977)

A two-way ANOVA with repeated measures was applied to study the effect of feature search and conjunction search on response time. In feature search, target present / absent had a significant main effect on response time, F(1, 77) = 13.56, p < .001. However, the effect on number of distractors was not significant, F(3, 231) = .25, p = .86. There was also no significant interaction effect between target present / absent and number of distractors, F(3, 231) = 1.2, p = .31. It supported that the responses time will be no difference when the number of distractors increases in feature searches.
In conjunction search, target present / absent had a significant main effect on response time, F(1, 77) = 190.69, p < .001. The responses time increased significantly when the number of distractors increased in conjunction searches, F(3, 231) = 258.33, p < .001. There was significant interaction effect between target present / absent and number of distractors, F(3, 231) = 52.37, p <

Our luggage must be examined by x-ray machine everytime when we departure or enter country to ensure there are no threatening objects in the luggage. However, the visual signal for screener is not clear among the messy background. In order to know whether practice on x-ray screening task having impact on search and / or recognition skills and evaluate the extent of development of search and recognition skills are particular to the target stimuli arising from training, McCarley, Kramer, Wickens, Vidoni, & Boot (2004) conducted the experiment on simulated luggage-screening task.
In the experiment, 16 participants with normal visual acuity and color vision were divided into two groups. The task for them was to search knife images from 2 sets of x-ray images. All of them had to complete 5 sessions and each session contained 300 trials which 20% of them (60 trials) were target present and the others were target absent. The first group searched the knives from set 1 in first 4 sessions and set 2 in the last session. The second group searched for targets from set 2 in first 4 sessions and set 1 in the session