Introduction to Course Web Site: kotovsky/85102/home.php Instructor TA’s Major Instructional...

Introduction to Course

Web Site: www.psy.cmu.edu/~kotovsky/85102/home.php

• Instructor• TA’s• Major Instructional Strategy and Goals

– Depth, higher educ., focus, purpose(s)• Major Activities: highly varied• Methodology

Questions

For the first recitation, bring a significant or “big” and real question about psychology, one that psychology might (or perhaps might not) have an answer to, and be prepared to discuss it a bit and also turn it in to your TA. It should be something that you are genuinely interested in and curious about. Save a copy for yourself—it might come in handy when generating a paper topic!

Methodology: Some Basic Issues

• Why Psychology? (vs. other sources of wisdom)• Focus on actual data• Observation vs. experimentation• Independent and dependent variables• Experimental control-getting rid of spurious

variables• Correlation and causation• “Unusualness” of a result: statistics• Distributions (the statistical nature of our data)

Basic Methodology

• Observational vs. Experimental studiesCausation vs. Correlation

(storks, scz, food)

ExperimentationIndependent vs. Dependent Variables

Experimental “Control” & Confounds

(Hawthorne)

Making Observations• Scientific observations often begin with a

question or hypothesis.• The hypothesis must be testable.• This calls for an operational definition of key

terms to specify the study’s dependent variable.

• Data must also be systematically collected.• Researchers ignore anecdotal evidence.

Defining the Sample

• Based on observations of a sample, psychologists want to draw conclusions about a broad population.

• Random sampling• All members of the population have an

equal chance of being picked to participate.

• Researchers also use other procedures, including stratified sampling and case studies.

The Power of Experiments

• The two groups must be matched at the outset of the experiment.

• To ensure matching groups, researchers use:• random assignment (ex. Clinical trials)• within-subject comparison.

• taking precautions to address problems created by the sequence of conditions

The Control Condition

Assessing External Validity

• Researchers want their study to mirror circumstances of the broader world.• external validity

• External validity depends on many factors. • The study should not change behaviors the

researchers hope to understand.

Assessing External Validity

• One concern here involves the study’s possible demand characteristics:• Cues to participants/experiments about

how they’re supposed to behave (Rosenthal)

• One way of avoiding this problem is to use a double-blind design.

Measurement

• The Description of Data– Central tendency

• Mean, median, mode

– Variability• Variance• Standard deviation

– Correlation & significance level

Measurement

T H

HT

TH HHTT

T = tailsH = heads

Correlation Coefficients (0 – 1)

Sleeping

The ignored behavior!

Defining/describing sleep

• Decreased awareness & interaction with world• Decreased motility & muscular activity• Characteristic posture• Partial or total decrement in voluntary

consciously directed behavior• Decreased forebrain activity & cortical input

from lower centers

Sleep as a behavior

• Quietude

• Life span decrease

• Brain activity/EEG & reactivity

Theories of sleeping

• Motivation

• Energy conservation

• Restorative

• Memory consolidation

• Adaptive

Brain Control

Hypothalamus: Rostral/Caudal sleep areas– Rostral (stimulate --> sleep, extirpate --> wake)– Caudal (stimulate --> wake, extirpate --> sleep)– Reticular activating system & monitoring – Melatonin (& superchiasmatic nucleus of

hypothalamus) and diurnal rhythm “zeitgrabbers” – Dement in a cave!

Arguments for Necessity/Functionality of sleep!– Regularity– Motivation/crummy feelings– Health involvement

-Fatal Familial Insomnia (30+ families/thalamic/death)

-Some linkage to other disorders (depression, cold susceptibility)

-Check out CMU Psych study at: http://www.cmu.edu/news/stories/archives/ 2015/august/sleep-and-sickness.html

– Hallucination argument– REM recovery– Restorative: increase in SWS in sleep-deprived & athletes,

increase anabolic/decrease catabolic activity– Memory consolidation REM block->poor memory function

• Deprivation/human & animal• Exceptional sleepers• Hallucination explanation• Dement study 11 days deprv. Then 16/8• REM recovery: limited• Programmatic reduction-->1-2 hr. decline• 5.5/6, 1/2 hr per 2 weeks->4.5-5.5 ok and year

later slept 1 to 2.5 less!• Cats in a puddle!

Arguments Against Necessity

Conclusions

Adaptive theory seems to win!– The function of sleep is sleep!– Ungulates sleep much less than meat eaters

• Five hours or less (opossums 19-20 hours)

– Accounts for life span decrease as well– But still a bit of an open question

One Last Theory About Sleep

“Basic Satisfaction” Theory

– https://www.youtube.com/watch?v=MUw3s4evhTE

Dreaming: What & Why?

Multiple perspectives and much speculation!

Outline

• Dream behavior • Theories of Dreaming• Conclusions

– What can we learn from our dreams?

– Are they meaningful? True / predictive?

Dream behavior & description

• Within sleep

• Amount

• Brainwave activity & bodily quietude:the paradox

• REM

Dreams & REM sleep

• Aserinsky-REM

• Dement & Kleitman-Stages

• REM amount & periodicity

• Brainstem cholinergic & adrenergic promoting & inhibiting areas for REM

Some Questions:

• Are Dreams meaningful--what do they mean?• Are the predictive or “true”?• How do they differ from other states?• What is their function do they even have one?• Are they brain functions or mind functions?

Outline

• Characteristics and Descriptions

• Theories of Dreaming

• Conclusions– What can we learn from our dreams?

• Are they meaningful? True / predictive?

Theories of Dreaming

• Dreams as meaningful events:• Freud (& Jung) • Aserinsky, Dement & Kleitman implications• Hall/Cartright• Dreams as random activity (Hobson +)• Synthesis (perhaps)

Psychoanalytic Theory• Mental conflict• Unconscious motivations• Two forces: impulses & defenses• Dreams as a release• Dreamwork and its results

– Latent dream– Manifest dream– Remembered dream

Dreamwork and forgetting as protective mechanisms

Poetzel Effect

Freud & Neuroimaging

• Michael Anderson- Validates Repression: Forebrain active in inhibiting hippocampus on repressed items

• Allen Braun: Limbic system-emotion active during REM• Prefrontal cortex (working mem. Attention, logic & self-

monitoring) inactive during REM• Above consistent with dream bizarreness & emotional

disinhibition/wish fulfillment• Visual cortex inactive but higher visual areas active so we see

w.o. visual input- one of the amazing things about dreaming!

Freud & Neuroimaging (Mark Solms)

Injured Pons vs. injured Forebrain-Pons-disrupts REM but dreaming goes on. -Forebrain-lose dreaming but REM goes on.-Also, some dreaming outside of REM

Role of Motivation (in addition to emotional areas)-Prefrontal leukotomy (white matter in ventro-medial forebrain area) decreases dopamine release. It’s a motivational area “seeking” behavior. -Hartmann: administering dopamine supercharges dreaming! Supportive of Freudian tie between motiv. & dreaming.

Variations on Psychoanalytic Explanation + Challenges

• Aserinsky, Dement & Kleitman: REM & implications• Hall and Cartwright: Dream Series• Challenging Views • Dreams as random activity (Hobson +)• Synthesis (perhaps) as Hobson accepted imaging

results

Other Neuroscience Views

• Crick: Purge extraneous connections

• Evans: Sorting function on day’s events

• Winson: Sorting for survival

• Wilson: Rat Dream article- maze learning during dreams

• Hobson: random activity & activation-synthesis hypothesis

Hobson: Dream Transformations

From: Inanimate Animate Character

To: Inanimate 21 0 0

Animate 2 0 7

Character 0 0 14

Dream CharacteristicsLack of active volition

Absence of ongoing reflective judgment

Limited to phenomena of the immediate present

Diffuse cognitive slippage--dreamlike confusion-transformations of perception, thought, memory, emotion,relationships, etc.

Gaps in experience: 20%Confusion of thought & irrational intuitions: 41%Problems in sustained attention: 5%Memory deficiencies within the dream: 15%

Overall, even 51% of "clearest dreams" had clouding of cs. --Usually not radical (scz, psychedelic) but rather more like that of waking life

Can even have hallucinations or psychedelic exper. in dreams (as in waking life!) ex. flying 4%, bizarre figures,4%, changed identity 3%, LSD-like transformations of vision 13%. Mostly visual 47%. Somatic 10%, audit. 14%.

Conclusions

• Can we obtain meaningful insights about ourselves through our dreams?

• What can we learn from our dreams?• Are they meaningful? true /

predictive/useful?• Dream problem-solving (Lowie, Kekule)!