Neuroscience and behavior

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Neuroscience and behavior

• Chapter 2

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Biological psychology

• Branch of psychology concern with the links
  between biology and behavior

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Neuron

• A nerve cell the basic building block of the
  nervous system.

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Dendrite

• The bushy, branching extensions of a neuron that
  receives messages and conduct impulses toward the
  cell body.

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Axon

• The extension of a neuron, ending in branching
  terminal fibers, through which messages passed to
  other neurons or to muscles or glands.

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Myelin sheath

• A layer of fatty tissue segmentally encasing the
  fibers of many neuron enables vastly greater
  transmission speed of neural impulses as the
  impulsive off from one node to the next.

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Action potential

1. And neural impulse a brief electrical charge
   that troubles down an axon. The action potential
   is generated by the movement of positively
   charged atoms in an out of channels in the axons
   membrane.

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Threshold

• The level of stimulation required to trigger a
  neural impulse.

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Synapse

• The junction between the axon tip of the sending
  neuron in the dendrite or cell body of the
  receiving neuron.
• The tiny gap at this junction is called the
  synaptic gap or cleft.

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Neurotransmitters

• Chemical messengers that transverse the synaptic
  gaps between neurons.
• One released by the sending neuron,
  neurotransmitters travel across a synapse and
  bind to receptors sites on the receiving neuron,
  thereby influencing whether that neuron will
  generate a neural impulse.

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Acetylcholine

• A neurotransmitter that enables learning and
  memory and also triggers muscle contraction.

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Endorphins

• Natural opiate like in neurotransmitters linked
  to pain control and to pleasure.

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Nerves

• Neural cables containing many axons.
• These bundle axons, which are part of the
  peripheral nervous system, connect the central
  nervous system with muscles, glands, and sense
  organs.

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Sensory neurons

• Neurons that carry incoming information from the
  sense receptors to the central nervous system.

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Motor neurons

• Neurons that carry outgoing information from the
  central nervous system to the muscles and glance.

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Interneuron's

• Central nervous system neurons that internally
  communicate and intervene between the sensory
  inputs and motor outputs.

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Somatic nervous system

• The division of the peripheral nervous system
  that controls the body skeletal muscles.
• Also called the skeletal nervous system.

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Autonomic nervous system

• The part of the peripheral nervous system that
  controls the glands and the muscles of the
  internal organs.
• Its sympathetic division arouses its
  parasympathetic division calms.

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Parasympathetic nervous system

• The division of the autonomic nervous system that
  calms the body, conserving its energy.

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Reflex

• Is simple, automatic, inborn response to a
  sensory stimulus, such as the knee-jerk response.

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Neural networks

• Interconnected neural cells.
• With experience, networks can learn, as feedback
  strengthen or inhibits connections to produce
  certain results.
• Computer simulations of neural network show
  analogous learning.

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Endocrine system

• The bodies slow chemical communication system
  a set of glands that secrete hormones into the
  bloodstream.

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Hormones

• Chemical messengers, mostly those manufactured by
  the endocrine glands, that are produced in ones
  tissue and affect another.

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Adrenal glands

• A pair of endocrine glands just above the
  kidneys.
• The adrenals secrete the hormone epinephrine
  (adrenaline) norepinephrine (noradrenaline),
  which helped to arouse the body in times of
  stress.

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Pituitary gland

• The endocrine systems most influential gland.
  Under the influence of the hypothalamus, the
  pituitary regulates growth and controls other
  endocrine glands.

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Lesion

• A brain lesion is a naturally or experimentally
  caused destruction of brain tissue.

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Electroencephalogram (EEG)

• and amplified recording of the ways of
  electrical activity that sweep across the brains
  surface.
• These waves are measured by electrodes placed on
  the scalp.

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PET

• Positron Emission Tomography
• A visual display of brain activity that detects
  where a radioactive form of glucose goes while
  the brain performs a given task.

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MRI

• Magnetic resonance imaging
• A technique that uses magnetic fields and radio
  waves to produce computer-generated images that
  distinguish among different types of soft tissue
  allows us to see structures within the brain.

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fMRI

• Functional magnetic resonance imaging
• A technique for revealing blood flow and
  therefore, brain activity by comparing successive
  MRI scans.
• MRI scans show brain anatomy fMRI scans show
  brain function.

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Brainstem

• The oldest part in central core of the brain,
  beginning where the spinal cord swells as it
  enters the skull the brainstem is response for
  andautomatic survival functions.

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Medulla

• The base of the brain stem controls heartbeat
  and breathing.

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Reticular formation

• A nerve network in the brainstem that plays an
  important role in controlling arousal.

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Thalamus

• The brain sensory switchboard, located on top of
  the brainstem it directs messages to the sensory
  receiving areas in the cortex and transmit
  replies to the cerebellum and the medulla.

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Cerebellum

• The (little brain) attached to the rear of the
  brainstem its functions include processing
  sensory input, and coordinating movement output
  and balance.

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Limbic system

• A doughnut shaped system of neural structures at
  the borders of the brainstem and cerebral
  hemispheres associated with emotion such as the
  fear and aggression and drives such as those for
  food and sex.
• Includes a hippocampus, amygdala, the
  hypothalamus.

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Amygdala

• Two lima beans size neural clusters that are
  components of the limbic system and are linked to
  emotion.

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Hypothalamus

• A neural structure lying below the thalamus.
• It directs several maintenance activities
  (eating, drinking, body temperature), helps
  govern the endocrine system via the pituitary
  gland, and is linked to emotion.

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Cerebral cortex

• The intricate fabric of interconnected normal
  cells that covers the cerebral hemispheres the
  bodys ultimate control and information
  processing center.

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Glial Cells

• cells in the nervous system that support,
  nourished, and protect neurons.

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Frontal lobes

• The portion of the cerebral cortex lying just
  behind a forehead involved in speaking and
  muscle movements and in making plans and
  judgments.

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Parietal lobes

• The portion of the cerebral cortex lying at the
  top of the head and toward the rear receives
  sensory input for touch and body position.

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Occipital lobes

• The portion of the cerebral cortex lying at the
  back of the head includes visual areas, which
  receive visual information from the opposite
  visual field.

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Temporal lobes

• A portion of the cerebral cortex lying roughly
  above the ears includes the auditory areas, each
  of which receives auditory information primarily
  from the opposite ear.

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Motor cortex

• An area at the rear of the frontal lobes that
  controls voluntary movements.

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Sensory cortex

• The area in front of parietal lobes that register
  and processes body touch and movement sensations.

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Association areas

• Areas of the cerebral cortex that are not
  involved in primary motor or sensory functions
  rather, they are involved in higher mental
  functions such as learning, remembering,
  thinking, and speaking.

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Aphasia

• Impairment of language, usually caused by left
  hemisphere damage either to Brocas area
  (impairing speaking) or to Wernickes area
  (impairing understanding).

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Brocas area

• Controls language expression
• An area of the frontal lobe, usually in the left
  hemisphere, that directs the muscle movements
  involved in speech.

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Wernickes area

• Controls language reception a brain area
  involved in language comprehension expression
  visually in the left temporal lobe.

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Plasticity

• The brains capacity for modification, as evident
  in brain reorganization following damage
  (especially in children) and in experiments on
  the effects of experience on brain development.

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Corpus Callosum

• The large band of neural fibers connecting the
  two brain hemispheres and carrying messages
  between them.

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Split brain

• A condition in which two hemispheres of the brain
  are isolated by cutting the connecting fibers
  mainly those of the corpus callosum between
  them.