40
2
Neuroscience and Behavior
IN THIS CHAPTER:
INTRODUCTION: Neuroscience and Behavior
The Neuron: The Basic Unit of Communication
The Nervous System and the Endocrine System: Communication Throughout the Body
A Guided Tour of the Brain
Specialization in the Cerebral Hemispheres
PSYCH FOR YOUR LIFE: Maximizing Your Brain’s Potential
ASHA’S STORY
PROLOGUE
THE HEADACHES BEGAN WITHOUT WARNING. A pounding, intense pain just over Asha’s left temple. Asha just couldn’t seem to shake it—
But our friend Asha, a 32-
There were other, more subtle signs that something was wrong. Asha’s husband, Paul, noticed that she had been behaving rather oddly in recent weeks. For example, at Thanksgiving dinner, Asha had picked up a knife by the wrong end and tried to cut her turkey with the handle instead of the blade. A few hours later, Asha had made the same mistake trying to use scissors: She held the blades and tried to cut with the handle.
Asha laughed these incidents off, and for that matter, so did Paul. They both thought she was simply under too much stress. And when Asha occasionally got her words mixed up, neither Paul nor anyone else was terribly surprised. Asha was born in India, and her first language was Tulu. Although Asha was extremely fluent in English, she often got English phrases slightly wrong—
There were other odd lapses in language. “I would say something, thinking it was correct,” Asha re-
41
On Christmas morning, Paul and Asha were with Paul’s family, opening presents. Asha walked over to Paul’s father to look at the pool cue he had received as a gift. As she bent down, she fell forward onto her father-
Asha remembers nothing of the seizure or of being taken by ambulance to the hospital intensive care unit. She floated in and out of consciousness for the first day and night. A CAT scan showed some sort of blockage in Asha’s brain. An MRI scan revealed a large white spot on the left side of her brain. At only 32 years of age, Asha had suffered a stroke—
MYTH OR SCIENCE?
Is it true . . .
That oxytocin is the “love hormone,” making people more trusting and empathic?
That even simple behaviors and abilities involve the activation of multiple parts of the brain?
That you only use 10% of your brain?
That because their brains are wired differently, men and women think, feel, and behave differently?
That the right brain is creative and intuitive, and the left brain is analytic and logical, but that left-
That the brain is essentially “hardwired” by adolescence?
42
She remained in the hospital for 12 days. It was only after Asha was transferred out of intensive care that both she and Paul began to realize just how serious the repercussions of the stroke were. Asha couldn’t read or write and had difficulty comprehending what was being said. Although she could speak, she could not name even simple objects, such as a tree, a clock, or her doctor’s tie. In this chapter, you will discover why the damage to Asha’s brain impaired her ability to perform simple behaviors, like naming common objects.