1. Phi Phenomenon Demonstration This PowerPoint slide show will demonstrate the phi phenomenon. The phi phenomenon is the optical illusion of perceiving continuous motion between separate objects viewed rapidly in succession. It was defined by Max Wertheimer in 1912 (see chapter 5). In this experiment, you will see two slides in succession. The first slide will present a small circle in the left side of the screen and the second slide will show an identical circle at various distances to the right. The distance between the two circles is one independent variable. A second independent variable will be the inter- stimulus interval (ISI) or the delay between the time the first circle disappears and the second circle appears. According to Wertheimer, the perception of motion will decrease as the distance between circles increases and as the ISI increases. Your Task: Print out the “scorecard” provided in the assignment and fill in the table as you watch the slide show. Each presentation will be followed by a slide indicating the Distance and ISI for the trial you just observed. Simply fill in the corresponding blocks with the letters “Y” or “N” depending on whether or not you saw motion on a given trial. Bring the scoresheet to class so we can compile class data and test Wertheimer’s predictions.

2. Phi Phenomenon Demonstration You are about to begin the experiment. Please have your scorecard ready and record “Y” or “N” in the appropriate box after each trial. If the circle appears to slide across the screen, indicate “Y” but if the circle seems to disappear and then reappear at a new location, indicate “N.”

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6. Time = 200ms, Distance = 7 Did you See Movement? (Click for next trial) For this trial, you will fill in the cell indicated in yellow, get it? 50ms100ms200ms400ms Distance 1 2 3 4 5 6 7 8 9 10

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10. Time = 50ms, Distance = 5 Did you See Movement? (Click for next trial)

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14. Time = 50ms, Distance = 4 Did you See Movement? (Click for next trial)

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18. Time = 100ms, Distance = 7 Did you See Movement? (Click for next trial)

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22. Time = 200ms, Distance = 1 Did you See Movement? (Click for next trial)

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26. Time = 200ms, Distance = 8 Did you See Movement? (Click for next trial)

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30. Time = 100ms, Distance = 10 Did you See Movement? (Click for next trial)

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34. Time = 200ms, Distance = 2 Did you See Movement? (Click for next trial)

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38. Time = 200ms, Distance = 6 Did you See Movement? (Click for next trial)

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42. Time = 100ms, Distance = 2 Did you See Movement? (Click for next trial)

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46. Time = 400ms, Distance = 7 Did you See Movement? (Click for next trial)

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50. Time = 400ms, Distance = 10 Did you See Movement? (Click for next trial)

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54. Time = 100ms, Distance = 4 Did you See Movement? (Click for next trial)

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58. Time = 200ms, Distance = 10 Did you See Movement? (Click for next trial)

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62. Time = 200ms, Distance = 5 Did you See Movement? (Click for next trial)

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66. Time = 100ms, Distance = 8 Did you See Movement? (Click for next trial)

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70. Time = 50ms, Distance = 1 Did you See Movement? (Click for next trial)

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74. Time = 50ms, Distance = 8 Did you See Movement? (Click for next trial)

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78. Time = 100ms, Distance = 6 Did you See Movement? (Click for next trial)

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82. Time = 400ms, Distance = 5 Did you See Movement? (Click for next trial)

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86. Time = 400ms, Distance = 2 Did you See Movement? (Click for next trial)

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90. Time = 100ms, Distance = 3 Did you See Movement? (Click for next trial)

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94. Time = 50ms, Distance = 7 Did you See Movement? (Click for next trial)

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98. Time = 50ms, Distance = 10 Did you See Movement? (Click for next trial)

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102. Time = 100ms, Distance = 9 Did you See Movement? (Click for next trial)

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106. Time = 400ms, Distance = 3 Did you See Movement? (Click for next trial)

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110. Time = 400ms, Distance = 1 Did you See Movement? (Click for next trial)

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114. Time = 200ms, Distance = 3 Did you See Movement? (Click for next trial)

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118. Time = 200ms, Distance = 9 Did you See Movement? (Click for next trial)

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122. Time = 50ms, Distance = 3 Did you See Movement? (Click for next trial)

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126. Time = 50ms, Distance = 6 Did you See Movement? (Click for next trial)

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130. Time = 400ms, Distance = 9 Did you See Movement? (Click for next trial)

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134. Time = 400ms, Distance = 4 Did you See Movement? (Click for next trial)

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138. Time = 200ms, Distance = 4 Did you See Movement? (Click for next trial)

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142. Time = 50ms, Distance = 9 Did you See Movement? (Click for next trial)

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146. Time = 100ms, Distance = 5 Did you See Movement? (Click for next trial)

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150. Time = 50ms, Distance = 2 Did you See Movement? (Click for next trial)

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154. Time = 100ms, Distance = 1 Did you See Movement? (Click for next trial)

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158. Time = 400ms, Distance = 8 Did you See Movement? (Click for next trial)

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162. Time = 400ms, Distance = 6 Did you See Movement? (Click for next trial)

163. This Concludes the Experiment