Module 08 The Brain Module 8 The Brain
Module 08 The Brain
Module 8: The Brain Lower-Level Brain Structures: The Brainstem
Brainstem • The oldest part of the brain • Is responsible for automatic survival functions • Located where the spinal cord swells and the brain just begins
Medulla • The base of the brainstem • Controls life-supporting functions like heartbeat and breathing • Damage to this area can lead to death.
Reticular Formation • A nerve network extending up and down the spinal cord into the brain • Controls an organism’s level of alertness • Damage to this area can cause a coma.
Module 8: The Brain Lower-Level Brain Structures: The Cerebellum
Thalamus • Sits atop the brainstem • The brain’s sensory switchboard -directs messages to the sensory receiving areas in the cortex • Thalamus is Greek for “inner chamber. ”
Cerebellum • Latin for the “little brain” • Located in the rear of the brain • Helps coordinate voluntary movements and balance • If damaged, the person could perform basic movements but would lose fine coordination skills.
Brain Structures - Cerebellum • Insert “Brain Structures” Video #2 j from Worth’s Digital Media Archive for Psychology. • Instructions for importing the video file can be found in the ‘Readme’ file on the CD-ROM.
Module 8: The Brain Lower-Level Brain Structures: The Limbic System
Limbic System • A ring of structures around the thalamus; at the border of the brainstem and cerebral cortex • Helps regulate memory, aggression, fear, hunger, and thirst • Includes the hypothalamus, hippocampus, and amygdala
Brain Structures – Limbic System • Insert “Brain Structures” Video #2 g from Worth’s Digital Media Archive for Psychology. • Instructions for importing the video file can be found in the ‘Readme’ file on the CD-ROM.
Hypothalamus • Located directly under the front of the thalamus • Regulates eating, drinking, body temperature, and the fight or flight reactions to stress • Plays a role in emotions, pleasure, and sexual function
Hypothalamus and Aggression • Play “Aggression, Violence, and the Brain” (7: 17) Module #24 from The Brain: Teaching Modules (2 nd edition).
Hippocampus • Wraps around the back of the thalamus • Plays a role in processing new memories for permanent storage • Looks something like a seahorse – Hippo is Greek for “horse. ”
Amygdala • Two almond shaped structures • Controls emotional responses such as fear and anger
Module 8: The Brain The Cerebral Cortex
Cerebral Cortex • The body’s ultimate control and information processing center • Covers the brain’s lower level structures • Contains an estimated 30 billion nerve cells • Divided into four lobes
Corpus Callosum • The large band of neural fibers that connects the two brain hemispheres and carries messages between them • Is sometimes cut to prevent seizures
Corpus Callosum • Play “Severed Corpus Callosum” (10: 00) Segment #7 from Scientific American Frontiers: Video Collection for Introductory Psychology (2 nd edition).
Longitudinal Fissure • The crevice that divides the brain into two halves or hemispheres • This and other fissures in the brain create major divisions in the brain called lobes
Frontal Lobes • The portion of the cerebral cortex lying just behind the forehead • Is involved in making plans and judgments
Phineas Gage • Play “The Frontal Lobes and Behavior: The Story of Phineas Gage” (12: 03) Module #25 from The Brain: Teaching Modules (2 nd edition).
The Frontal Lobe • Play “The Frontal Lobes: Cognition and Awareness” (9: 05) Segment #7 from The Mind: Psychology Teaching Modules (2 nd edition).
Parietal Lobes • Regions available for general processing, including mathematical reasoning • Designated as the association lobes • Behind the frontal lobes
Occipital Lobe • The primary visual processing area • Located in the back of the head
Temporal Lobes • Includes the auditory cortex where sound information is processed • Located roughly above the ears
Cerebral Cortex
Cerebral Cortex
Brain Structures – Cerebral Cortex • Insert “Brain Structures” Video #2 c from Worth’s Digital Media Archive for Psychology. • Instructions for importing the video file can be found in the ‘Readme’ file on the CD-ROM.
Cerebral Cortex
Brain Structures – Cerebral Cortex • Insert “Brain Structures” Video #2 e from Worth’s Digital Media Archive for Psychology. • Instructions for importing the video file can be found in the ‘Readme’ file on the CD-ROM.
Cerebral Cortex
Motor Cortex • Area at the rear of the frontal lobes • Controls voluntary movement • Different parts of the cortex control different parts of the body. • The motor cortex in the left hemisphere controls the right side of the body and visa versa.
Somatosensory Cortex • Located in the front of the parietal lobes • Registers and processes body senses • Soma is Greek for “body. ”
Motor and Sensory Cortex • Play “Image-Guided Surgery” (13: 07) Segment #6 from Scientific American Frontiers: Video Collection for Introductory Psychology (2 nd edition).
Module 8: The Brain Hemispheric Differences
Hemispheric Differences • “Left-brained” and “right-brained” debunked • Brain is divided into two hemispheres but works as a single entity. • Both sides continually communicate via the corpus callosum, except in those with split brains.
Split Brain Patient • Play “The Divided Brain” (6: 46) Module #5 from The Brain: Teaching Modules (2 nd edition).
Module 8: The Brain Hemispheric Differences: Language and Spatial Abilities
The Brain’s Left Hemisphere • For most people, language functions are in the left hemisphere. • For a small percentage of people, language functions are in the right hemisphere.
Broca’s Area • Located in the frontal lobe and usually in the left hemisphere • Responsible for the muscle movements of speech • If damaged the person can form the ideas but cannot express them as speech
PET Scan of Broca’s Area
Broca’s Area This is the brain of “Tal” from whom Broca discovered the area for speech. Note the damage to Broca’s Area.
Language and the Brain • Play “Language Centers in the Brain” (3: 39) Segment #16 from Psychology: The Human Experience.
Wernicke’s Area • Located in the temporal lobe • Involved in language comprehension and expression; our ability to understand what is said to us • Usually in the left temporal lobe
PET Scan of Wernicke’s Area
The Brain’s Right Hemisphere • Houses the brain’s spatial abilities • Our spatial ability allows us to perceive or organize things in a given space, judge distance, etc. • Helps in making connections between words
Broca’s and Wernicke’s Areas • Play “Language and Speech: Broca’s and Wernicke’s Areas” (7: 44) Module #6 from The Brain: Teaching Modules (2 nd edition).
Brain Specialization • Insert “Brain Imaging” Video #2 b from Worth’s Digital Media Archive for Psychology. • Instructions for importing the video file can be found in the ‘Readme’ file on the CD-ROM.
Module 8: The Brain Plasticity
Plasticity • The ability of the brain tissue to take on new functions • Greatest in childhood • Important if parts of the brain are damaged or destroyed
Brain Plasticity • Play “Brain Anomaly and Plasticity: Hydrocephalus” (7: 02) Module #7 from The Brain: Teaching Modules (2 nd edition).
The End
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