Test 2 Flashcards
(113 cards)
Consciousness
Awareness of the self, environment
Enables humans to exert voluntary control and communicate mental states
Can be altered
Sequential processing
Processing one aspect of a problem at a time
Used on new or complex tasks
Parallel processing
Processing many aspects of a problem simultaneously
Brain’s natural mode of information processing for many functions.
Selective attention
Focusing conscious awareness on a particular stimulus
Inattentional blindness
Failure to see visible objects when ones attention is directed elsewhere. (Monkey business)
Change blindness
Failing to notice changes in the environment (two guys switching)
During sleep, the human auditory cortex…
Responds to sound stimuli
Circadian rhythm
Internal biological clock. Regular bodily rhythm that occurs on a 24 hour cycle. Altered by age, experience
The suprachiasmatic nucleus (SNC)
When light hits the eye’s retina, signals the SNC suppress melatonin production.
At night the SNC calms down allowing the release of melatonin into the bloodstream.
Sleep
Periodic natural loss of consciousness
Different from unconsciousness caused by comas, anesthesia etc..
EEG and sleep
Can detect brainwaves when an individual is asleep
When awake but relaxed, alpha waves
NREM-1 Sleep
Irregular brain waves of the non-REM sleep stage.
May experience hypnagogic sensations.
NREM-2 Sleep
Deeply relaxed state that lasts for 20 minutes. EEG depicts bursts of rapid rhythmic brain activity
NREM-3
sleep state that lasts for 30 minutes;
Delta waves, slow longer waves
After an hour total of the sleep cycle and this stage, head back to NREM-2
REM Sleep
After going back to NREM-2.
Recurring sleep stage.
Heart rate rises and breathing becomes rapid and irregular.
Eyes dart around which indicates dreaming.
Genitals become aroused, no matter the dream
Motor cortex is active, brainstem blocks its messages enabling the relaxation of muscles.
Paradoxical sleep
The body is internally aroused but externally calm.
The sleep cycle…
It repeats itself every 90 minutes.
REM sleep periods get longer.
Dreams
Sequences of images, emotions, and thoughts passing through a person’s mind.
The Two-Track mind is continuously monitoring the environment during sleep, brings in stimuli
Reasons we sleep…
To file away memories
Cognitive development
Neural pathways…
REM starts in the…
Pons
Dreams are like…
Noise from machines, just a byproduct of the brain working.
Substance use disorder
Continued substance craving and use despite significant life disruption and risk
Psychoactive drugs
Chemicals that change perceptions and mood
Stimulate, inhibit or mimic activities of neurotransmitters
Tolerance
Dwindling effect with regular use of the same dose of a drug
Required to take longer and larger doses to experience the drugs effect