CHAPTER III. Reactions of Different Levels 45

REACTIONS OF DIFFERENT LEVELS 45

Different Sorts of Stimuli 47

The Motor Centers, Lower and Higher 49

How the Brain Produces Muscular Movements 53

Facilitation and Inhibition 54

Super-motor Centers in the Cortex 56

Speech Centers 57

The Auditory Centers 59

The Visual Centers 62

Cortical Centers for the Other Senses 68

Lower Sensory Centers 64

The Cerebellum 66

Different Levels of Reaction 65

Exercises 67

References 67