the ability of your neurons to process information, store and recall it and make decisions
excitatory postsynaptic potential (EPSP)
usually results from Na+ flowing into the cell and cancelling some of the negative charge on the inside of the membrane
inhibitory postsynaptic potential (IPSP)
some are produced by a neurotransmitter opening ligand-regulated chloride gates causing Cl- to flow into the cell and make the cytosol more negative
any voltage change in that direction makes a neuron more likely to fire and is therefore called
a neurotransmitter hyperpolarizes the postsynaptic cell and makes it more negative than the RMP - this makes the postsynaptic cell less likely to fire
ACh and norepinephrine
are excitatory to some and inhibitory to others, depending on the type of receptors present on the target cell
It is fundamentally a balance between EPSPs and IPSPs that enable the nervous system to make ________.
single action potential
A __________ in a synaptic knob does not produce enough activity to make a postsynaptic cell fire.
temporal summation and spatial summation
There are two ways to reach threshold and cause a postsynaptic neuron to fire
occurs when a single synapse generates EPSPs so quickly that each is generated before the previous one fades
occurs when EPSPs from several different synapses add up to threshold at the axon hillock.
is the opposite of facilitation, it is the mechanism in which one presynaptic neuron supresses another one.
The nervous system myst interpret and pass along both ______________ and ____________ information about its environment.
the way in which the nervous system converts information to a meaningful pattern of action potentials is called _______________.
labeled line code
the most important mechanism for transmitting qualitative information is the ______________.
labeled line code
is based on the fact that each nerve fiber to the brain leads from a receptor that specifically recognizes a particular stimulus type
Each nerve fiber to the brain is a line of __________ recognized by the brain, as representing a particulr stimulus quality - the color of light, pitch of sound, salty or sour taste.
absolute refractory period
there is a limit to how often a neuron can fire, set by its __________________.
lowest, high threshold
A weak stimulus excites neurons with the __________ thresholds, while a strong stimulus excitesless sensitive _____________ neurons.
neurons function in larger ensembles called __________ each of which consists of thousands to millions of interneurons concerned with a particular body function.
broader zone where the neurons synapses with still other neurons in the pool with fewer synapses on each of them. it can stimulate those neurons to fire only with the assistance of other input neurons
In _______________ the presynaptic neuron lacks enough synaptic contacts with a postsynaptic neuron to induce firing by itself -- but it can collaborate with other presynaptic neurons, facilitating each other in making the postsynaptic cell fire
discharge zone, spatial summation
In the _____________ the presynaptic input neuron has so many synaptic contacts with each postsynaptic neuron that it alone can induce the postsynaptic cell to fire, employing ____________.
The functions of a neural pool are partly determined by its ______________ the pathways among its neurons.
diverging circuit, converging circuit, reverberating circuit, parallel after-discharge circuit
Name the four principal kinds of neural circuits.
this type of neural circuit makes it possible for one motor neuron of the brain to ultimately stimulate thousands of muscle fibers.
is the opposite of a diverging circuit - input from many different nerve fibers is funneled to one neuron or neuron pool
this type of neural circuit allows input from our eyes, inner ears and stretch receptors in the neck to be channed to an area of teh brain concerned with the sense of balance.
neurons stimulate each other in a linear sequence A-->B-->C-->D, but neuron C sends an axon collateral back to A and restimulates
this type of neural circuit sends repetitious signnals to your diaphragm and intercostal muscles to make you inhale
parallel after-discharge circuit
this type of neural circuit explains why you can stare at a lamp, then close your eyes and continue to see an image for a while
Unlike a reverberating circulit, parallel after-discharge circuit has no _______________.
memory trace (engram)
The physical basis of memory is a pathway through the brain called a _________________ in which new synapses have formed or existing synapses have been modified to make transmission easier.
synapses can be formed or deleted in as little as 1 to 2 hours, this ability of synapses to change is called ___________.
is a form of STM that allows us to hold an idea in mind long enough to carry out an action such as calling a telephone # we just looked up or working out the steps of a math problem.
somewhat longer lasting memories probably involve an effect called _________________-induced by tetanic stimulation, the rapid arrival of repetitive signals at a synapse.
The increased size of postsynaptic membrane potentials after tetanic stimulation.
long term memory
lasts up to a lifetime and is less limited than STM in the amount of information it can store.
the retention of events and facts that you can put into words - numbers, dates, and so forth
Some ___________ involves the physical remodeling of synapses or the formation of new ones through the growth and branching of axon terminals and dendrites.
In the pyramidal cells of the brain, the dendrites are studded with knob-like ____________ that increase the area of synaptic contact.
An increase in a synapse's firing potential after brief, rapid stimulation. Believed to be a neural basis for learning and memory.