Exam 1 Study Guide Flashcards
Mind-body problem
A person is capable of being conscious and rational only because of having a mind, but how can a non material mind produce movements in a material body?
Rene Descartes
Described a relation between the mind and the brain
Dualism
The position that mind and body are separate but can interact
Monism
Monists avoid the mind-body problem by postulating that the mind and body are simply a unitary whole
Materialism
The idea that rational behavior can be fully explained by the working of the NS without any need to refer to a nonmaterial mind
Franz Josef Gall and Johann Casper Spurzheim
- developed the idea that different parts of the brain have different functions
- proposed that the cortex and it’s gyri were functioning parts of the brain and not just coverings for the pineal body
- proposed that the cortex produces behavior thru the control of other parts of the brain and spinal cord thru the corticospinal tract
Phrenology
- study of the relation b/w the skull’s surface features and a person’s faculties
- this map shows the relation b/w brain functions and the skull surface
- criticisms:
- characteristics such as faith,
self-love, and veneration are
impossible to define and quantify
objectively - phrenologists also failed to
recognize that the superficial
features of the skull reveal little
about the underlying brain
- characteristics such as faith,
Cranioscopy
A method in which a device was placed around the skull to measure the bumps and depressions there
Localization of function
A general theory developed by Gall to show how the brain might produce differences in individual abilities
Localizationalists
People who believed that functions of the body could be localized to a side of the brain
Aphasia
Defect or loss of the power of expression by speech, writing, or signs or of comprehending spoken or written language due to injury or disease of the brain
Alexia
Loss of the ability to read
Apraxia
An inability to make sequences of movements
Paul Broca
- located speech in the third convolution (gyrus) of the frontal lobe on the left side of the brain
- demonstrated that language is localized
- experimented on Tan
Broca’s area
The anterior speech region of the brain
Broca’s aphasia
The syndrome that results from the damage to the anterior speech region of the brain
Tan
- had paralysis on right side of brain
- could only say the word “tan” and utter an oath
- had a lesion on his left frontal lobe
Carl Wernicke
- the first notable scientist to dissent Broca’s findings
- suspected a relation b/w the functioning of hearing and that of speech
Wernicke’s area
The region of the temporal lobe associated with this form of aphasia
Wernicke’s aphasia
AKA: temporal-lobe aphasia or fluent aphasia
Arcuate fasciculus
- a pathway in which auditory ideas can be sent from Wernicke’s area
- leads to Broca’s area, where the representations of speech movements are stored
Conduction aphasia
A speech deficit in which, if arcuate fibers connecting the two speech areas were cut, disconnecting the areas but without inflicting damage on either one
Norman Geschwind
Confirmed and updated Wernicke’s speech model
Disconnection
Predicts that complex behaviors are built up in assembly-line fashion as information collected by sensory systems enters the brain and travels thru different structures before resulting in an overt response
John Hughlings-Jackson
- observed recovery of function in humans who had suffered brain injury
- proposed that the NS was organized as a function hierarchy
Hierarchal organization of function
Each successively higher level controls more complex aspects of behavior and did so by means of the lower levels
HM
- a patient of Scoville
- was treated for epilepsy
- the treatment was successful in stopping the epilepsy, but left him with amnesia, and he wasn’t able to make new memories
William Scoville
Bilaterally removed the medial parts of the temporal lobes from patient HM, who had epilepsy
Brenda Milner
Revealed that there is not just one memory structure in the brain but rather that a number of neural structures encode memories separately and in parallel
The binding problem
Expresses the puzzle that, altho the brain analyzes sensory events thru multiple, parallel channels that don’t converge on a single brain region, we perceive a unified representation of our experiences
Joseph Bogen and Philip Vogel
- cut the corpus callosum and the smaller commisures that connect the two cortical hemispheres
- this reduced the seizures and improve the lives of these “split brain” patients
Roger Sperry
Conducted a series of studies on patients with “split brains” that overthrew the classical view of the role of the two hemispheres and revolutionized approaches to the study of mental functions
Split-brain research
Demonstrated that each disconnected hemisphere has it’s own higher gnostic (knowing) function
Lesion
Any damage to the nervous system
Brain hypothesis
The idea that the brain is responsible for all behavior
Neuron hypothesis
The idea that the unit of brain structure and function is the nerve cell
3 aspects: 1. Neurons are discrete, autonomous cells that interact but not physically connected 2. They send electrical signals that have a chemical basis 3. They communicate with one another by using chemical signals
Theodor Schwann
Enunciated the theory that cells are the basic structural units of the NS, just as they are for the rest of the body
Camilio Golgi
Impregnated tissue with silver nitrate and found that a few cells in their entirety - cell body, dendrites, and axons - became encrusted with silver
Santiago Ramon y Cajal
Used Golgi’s silver-staining technique to examine the brains of chicks at various ages and pronounced beautiful drawings of neurons at different stages of growth
Electrical stimulation of brain
Causes muscle contractions (tested on a frog)
Gustav Theodor Fritsch and Eduard Hitzig
Studied how electrical conduction thru the body might relate to information flow in neurons
Charles Sherrington
- examined how nerves connect to muscles and first suggested that there is no continuous connection
- theorized that neurons are connected by junctions and that additional time is required for the message to get across the junction
Synapse
Junctions that neurons need to get messages around the body
Otto Loewi
Demonstrated that chemicals carry the message across the synapse
Wilder Penfield
Noted, with Herbert Jasper, that anthropologists have found evidence of brain surgery dating to prehistoric times
Alfred Binet and Theodore Simon
- came up with a solution to the problem of identifying who would perform poorly on a test
- commissioned to develop tests to identify retarded children so that they could receive special instruction
Lewis Terman
Produced a version of the Stanford-Binet test in which the intelligence quotients were first used
Intelligence quotient (IQ)
Calculated by mental age divided by chronological age times 100
Multiple sclerosis
- a degenerative disease characterized by a loss of sensory and motor function
- results from hardening of nerve-fiber pathways in the spinal cord
Brain imaging
- allows rapid correlation between symptoms and brain pathology
- an essential tool for diagnosis
Computerized tomography (CT)
- entails the passage of X-rays thru the head
- produces a darker image of the brain
- generates a 3D image of the brain
Positron emission tomography (PET)
- entails the injection of radioactive substances that decay in minutes into the bloodstream so that they reach the brain
- gives off photons that are detected in the brain
- 2 or 3D reconstruction of the brain
Magnetic resonance imaging (MRI)
Calculates the location of moving molecules by detecting the electrical charge generated by their movement
Sympathetic NS
- fight or flight
- activates body so it can respond to an emergency
- increased HR and respiratory rate
- release of adrenaline
- awareness constricts
- blood in GI constricts, gets shunted to muscles
- sweat on palms/soles of feet (better traction)
- blood carries lots of oxygen and glucose
Parasympathetic NS
- rest and digest
- blood goes to internal organs
- blood shunted to core of body
- glucose goes back into liver
- “reboot” body for next emergency
Paraplegia
Bottom half of the body is paralyzed
Quadriplegia
All four limbs paralyzed
Hemiplesia
Lateral half of body paralyzed (if right side of brain damaged, left side of body paralyzed)
Hemiparesis
- almost same as hemiplegia
- not a total loss of movement, but profound weakness
Cross sectional views of the brain
- coronal
- horizontal
- sagittal/midsagittal