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Flashcards in week 1 (test 1) Deck (29):
1

what is sleep?

- a complex neurobehavioral state
- reduced awareness of environment
- rapid reversibility
- regular recurrence

2

neurological behaviors of sleep

- widespread change in cns
- predictable regional changes in neuronal firing rate
- widespread changes in systemic physiology

3

what is the sleep cycle?

NREM and REM sleep
- alternate in 90-110 minute cycles
- typical night is 4-5 cycles

4

5-step process of sleep

-stage 1=drifting off
- next 30-40 minutes the person cycles into stage 2-4, backtracks through 3 and 2 then into REM

5

stage 1 (NREM)

- dozing stage
- ~5% of NREM sleep
- transitional period of very light sleep
- muscles and breathing relax but can be awakened easily

6

stage 2 (NREM)

- official onset of consolidated sleep
- 45% of NREM sleep
- sleep spindes and k-complexes

7

stage 3 (NREM)

- deep sleep
- 25% of NREM sleep
- brain activity primarily delta wave forms

8

sleep spindle

pattern of eeg waves consisting of a burt of 11-15 hertz waves that last for .5-1.5 seconds

9

k-complex

high voltage eeg activity that last more than .5 seconds

10

rem sleep

- periodic eyelid fluttering, muscle paralysis, irregular breathing, body temp, heart rate and blood pressure
- brain activity is similar to awake state
- 20-25% of sleep cycle

11

what determines when we sleep

- homeostatic regulation
- circadian rhythm

12

homeostasis

sleep pressure function of wake:sleep

13

circadian rhythm

biological clock:: cycles ~24 hours

14

actigraphy

motion-sensitive accelerometer worn on wrist

15

polysomnography (PSG)

modification of eeg
- eye movements
- muscle tone

16

pros of self reporting sleep

- moderate participant burden
- low cost
- valid for many dimensions of sleep

17

cons of self reporting sleep

- bias (affect, recency, telescoping, memory)

18

pros of actigraphy

- moderate participant burden
- moderate cost
-valid for many dimensions of sleep

19

cons of actigraphy

- doesn't really measure sleep
- dependent on correctly identifying sleep start and end

20

pros of psg

- accurate identification of phenomena of interest
- increased options for quantifying phenomena of interest
- valid for most dimensions of sleep

21

cons of psg

- high participant burden
- expensive

22

5 types of brainwaves

- gamma
- beta
- alpha
- theta
- delta

23

awake brainwaves

- low voltage, high frequency
- beta

24

drowsy brainwaves

alpha

25

stage 1 brainwaves

theta

26

stage 2 brainwaves

- sleep spindles
- mixed eeg activity

27

sws (3 & 4) brainwaves

delta

28

rem brainwaves

low voltage, high frequency

29

suprachiasmatic nucleus

- in the hypothalamus
- "clock"