Table of Contents 



IX 



CHAPTER VIII 



SPATIALLY DETERMINED REACTIONS AND SPACE PERCEP- 

 TION 



53. Classes of Spatially Determined Reactions. 

 54. Class I : Reactions to a Single Localized Stimu- 

 lus. 55. Class II: Orienting Reactions: Possible 

 Modes of Producing Them. 56. Orientation to Gravity : 

 Protozoa. 57. Orientation to Gravity : Coelenterates. 

 58. Orientation to Gravity : Planarians. 59. Orien- 

 tation to Gravity: Annelids. 60. Orientation to 

 Gravity: Mollusks. 61. Orientation to Gravity: 

 Echinoderms. 62. Orientation to Gravity : Crustacea. 

 63. Orientation to Gravity: Spiders and Insects. 

 64. Orientation to Gravity : Vertebrates. 65. The 

 Psychic Aspect of Orientation to Gravity. 66. Orien- 

 tation to Light : Photopathy and Phototaxis. 67. In- 

 stances of Photopathy and Phototaxis. 68. Direction 

 and Intensity Theories of Phototaxis. 69. The Eyes 

 in Phototaxis. 70. Influences affecting the Sense of 

 Light Orientations. 71. Mutual Influence of Light 

 and Gravity Orientations. 72. The Psychic Aspect 

 of Orientation to Light. 73. Orientation to Other 

 Forces . 



148-189 



CHAPTER IX 



SPATIALLY DETERMINED REACTIONS AND SPACE PERCEP- 

 TION (continued) 



74. Class III : Reaction to a Moving Stimulus. 

 75. Class IV: Reaction to an Image. 76. Methods 

 of Investigating the Visual Image: the Size Test. 

 77. Methods of Investigating the Visual Image : the 

 Form Test. 78. Class V : Reactions adapted to the 

 Distance of Objects. 79. Some Theoretical Consid- 

 erations 



190-204 



