AP Psychology Unit 1 Comprehensive Review

Review Strategies and AP Exam Preparation

• Practice Resources: The AP Classroom has made available three exams, including multiple-choice questions and Free Response Questions (FRQs).

• Brain and Cognition Club Tips:   - Avoid passive review: Do not merely review what you already know because it makes you feel good.   - Start with a practice test to identify trends and topics where multiple questions are missed.   - Use individual study data to drive the focus of review rather than going through material in a generic sequence.

Neuroanatomy and Physiological Functions in Practice (Riding a Bike)

• Cerebellum: Located in the back of the brain. It is responsible for balance and motor skills. It manages implicit memories and muscle memory for learned activities such as walking, handwriting, going upstairs, and riding a bike. It allows these actions to occur without conscious thought.

• Medulla: Regulates vital autonomic functions including heart rate, breathing, and blood pressure. A mnemonic provided: "Medusa turns your heart to stone" (Medulla regulates the heart).

• Reticular Formation: Maintains alertness and help regulate the sleep cycle. It is involved in activating the sympathetic nervous system and the fight-or-flight response.

• Hypothalamus: Maintains homeostasis within the body. It regulates temperature (e.g., prompting one to put on a sweatshirt if cold).

• Thalamus: Functions as the brain's sensory relay station. It receives and processes all sensory signals except for the sense of smell. For example, it processes the sight or sound of an approaching car while biking.

• Corpus Callosum: A bundle of nerve fibers that connects the two hemispheres of the brain. It allows for the integration of the right and left visual fields.

• Amygdala: Responsible for processing strong emotions, specifically fear and anger. In a biking context, this might be activated by a car horn or a near-accident, prompting a fear response.

• Hippocampus: Responsible for the transition of short-term memory to long-term memory. It allows a rider to remember the route they are taking.

• Frontal Lobe: Involved in planning and executive function, such as planning the route for a bike ride.   - Broca’s Area: Located in the left hemisphere of the frontal lobe. It allows for the production of clear, "not broken" speech (mnemonic: Broca's = broken).

• Parietal Lobe: Processes sensory information, primarily through the somatosensory cortex.

• Temporal Lobe: Responsible for hearing and language processing.   - Wernicke’s Area: Located in the left hemisphere of the temporal lobe. It allows for the understanding of language. Damage to this area results in the inability to comprehend spoken words.

• Occipital Lobe: Located at the back of the brain; responsible for visual processing and seeing where one is going.

Stages and Cycles of Sleep

• Non-REM Stage 1 (NREM-1):   - Characterized by hypnagogic sensations (the feeling of falling).   - A very light sleep from which one is easily awakened.   - High responsiveness to external sensations.   - Typically lasts about $10\,minutes$ during the first cycle of the night.

• Non-REM Stage 2 (NREM-2):   - A transitional stage between light sleep and deep sleep.

• Non-REM Stage 3 (NREM-3):   - The deepest stage of sleep.   - Characterized by delta waves on an EEG. Delta waves are the most indicative sign of deep sleep.   - This stage is where sleepwalking (somnambulism), sleep talking, and night terrors occur.   - This stage occurs primarily in the first few hours of the night and eventually disappears as the night progresses.

• REM (Rapid Eye Movement) Sleep:   - Known as Paradoxical Sleep: The body’s large muscles are paralyzed, but the brain is highly active.   - Internal systems (heart rate, body temperature) increase.   - Vivid dreaming occurs here.   - Vital for memory consolidation, body restoration, and immune system strengthening.   - REM periods get longer as the night goes on.

• Sleep Cycle Pattern:   - The typical progression is: Awake $\rightarrow$ Stage 1 $\rightarrow$ 2 $\rightarrow$ 3 $\rightarrow$ 2 $\rightarrow$ 1 $\rightarrow$ REM.   - As the night continues, the cycle shifts to: 1 $\rightarrow$ 2 $\rightarrow$ 1 $\rightarrow$ REM (Stage 3 drops out).

Sleep Theories and Disorders

• Sleep Theories:   - Restoration Theory: Suggests the primary purpose of sleep is the repair and restoration of the body and brain.   - Memory Consolidation: Dreams and REM sleep help organize the day's content and strengthen neural connections.   - Activation-Synthesis Theory: Suggests dreams are the brain’s attempt to make sense of random neural firing during sleep.   - Psychoanalytic Theory (Freud): Dreams have "Manifest Content" (the actual storyline) and "Latent Content" (the hidden psychological meaning/interpretation).

• Sleep Disorders:   - Insomnia: Persistent inability to fall or stay asleep.   - Narcolepsy: Sudden, uncontrollable attacks of extreme sleepiness, often linked to genetics.   - REM Sleep Behavior Disorder: Acting out dreams while asleep, which can be disruptive or result in injury.   - Sleep Apnea: Temporary cessation of breathing during sleep, common in men and those who are overweight; often treated with a CPAP machine.   - Night Terrors: Violent physical reactions (lashing out, yelling) during NREM-3 with no memory of the event the next day; distinct from nightmares.

Sensation and Perception Principles

• Sensation: The physical stimuli received by sensory receptors; associated with Bottom-Up Processing.

• Perception: The brain’s interpretation of sensory stimuli; associated with Top-Down Processing.

• Absolute Threshold: The minimum amount of stimulus needed to detect a signal $50\%$ of the time.

• Difference Threshold (Just Noticeable Difference / JND): The ability to notice a change in stimuli.   - Weber’s Law: To notice a change, the stimulus must change by a constant minimum percentage, not a constant amount.   - Example: Comparing a $10\,watt$ to a $15\,watt$ bulb ($50\%$ increase) establishes the ratio. To notice a difference from a $100\,watt$ bulb, it must increase to $150\,watt$.

• Sensory Adaptation: Decreased sensitivity to a constant stimulus over time (e.g., eyes adjusting to a dark room or getting used to the temperature of a hot tub).

• Habituation: A learning process where one stops responding to a repeated stimulus in the environment (e.g., no longer waking up to New York City sirens).

• Sensory Interaction: Senses do not work alone (e.g., pinching the nose to avoid the taste of cough syrup; the interaction of smell and taste).

• Synesthesia: A condition where one sensation (like hearing music) triggers another perception (like seeing colors).

The Physics of Light and Sound

• Wavelength and Frequency:   - Shorter wavelength = Higher frequency = Bluer colors / Higher pitched sounds.   - Longer wavelength = Lower frequency = Redder colors / Lower pitched sounds.

• Hue: Another term for color.

• Amplitude:   - Greater amplitude = Brighter colors / Louder sounds.   - Smaller amplitude = Duller colors / Quieter sounds.

Anatomy and Function of the Eye (Driving Context)

• Retina: Processes surroundings, road signs, and hazards.

• Blind Spot: The area where the optic nerve contacts the back of the eye; the brain fills in the gaps, similar to checking a vehicle's blind spot.

• Lens: Adjusts to focus on objects near or far, similar to a camera lens.

• Accommodation: The process by which the lens adjusts its curvature to focus on near or far objects.

• Visual Impairments:   - Nearsightedness (Myopia): Ability to see close objects clearly (e.g., the dashboard) but not distant ones (e.g., road signs).   - Farsightedness (Hyperopia): Ability to see distant objects clearly but struggling with close-up tasks.

• Rods: Responsible for night vision and perceiving black, white, and gray hues.

Questions & Discussion

• Q: Regarding synesthesia, can the person actually see the colors or is it just in their head?

• A: The speaker explained that transduction (converting one energy form to another) occurs, but in synesthesia, the stimulus activates multiple parts of the brain. The person painted the music she heard because she was perceiving those colors as a result of the auditory stimulation. It is an actual perceptual experience for them at different points in the sensation.

• Practice Resources: AP Classroom offers three exams with multiple-choice and Free Response Questions.

• Brain and Cognition Club Tips: Avoid passive review; instead, begin with a practice test to identify weak areas and focus review on those topics.

Neuroanatomy and Physiological Functions

• Cerebellum: Balance, motor skills, and implicit memory for activities like riding a bike.

• Medulla: Regulates heart rate and breathing; mnemonic: "Medusa turns your heart to stone."

• Reticular Formation: Maintains alertness, regulates sleep cycle, and activates the sympathetic nervous system.

• Hypothalamus: Maintains homeostasis, regulating body temperature.

• Thalamus: Sensory relay station (except smell), processing signals like sight and sound.

• Corpus Callosum: Connects hemispheres for integrated processing.

• Amygdala: Processes strong emotions, especially fear.

• Hippocampus: Transitions short-term to long-term memory.

• Frontal Lobe: Involved in planning and executive function.

• Parietal Lobe: Processes sensory information.

• Temporal Lobe: Responsible for hearing and language processing.

• Occipital Lobe: Visual processing center.

Stages and Cycles of Sleep

• NREM-1: Light sleep with high responsiveness to stimuli.

• NREM-2: Transitional stage to deep sleep.

• NREM-3: Deepest sleep stage, characterized by delta waves; sleepwalking occurs here.

• REM: Paradoxical sleep for vivid dreaming and vital for memory consolidation.

• Sleep Cycle: Typical progression from awake to REM with variations over the night.

Sleep Theories and Disorders

• Sleep Theories: Include Restoration Theory, Memory Consolidation, Activation-Synthesis, and Psychoanalytic Theory.

• Sleep Disorders: Include insomnia, narcolepsy, REM Sleep Behavior Disorder, sleep apnea, and night terrors.

Sensation and Perception Principles

• Sensation: Physical stimuli received by receptors; associated with Bottom-Up Processing.

• Perception: Brain's interpretation of stimuli; associated with Top-Down Processing.

• Absolute Threshold: Minimum stimulus for detection.

• Difference Threshold: Minimum change needed to notice a difference (Weber’s Law).

• Sensory Adaptation: Decreased sensitivity to constant stimuli.

• Habituation: Stopping response to repeated stimuli.

• Sensory Interaction: Senses work collectively.

• Synesthesia: One sensation triggers another perception.

The Physics of Light and Sound

• Wavelength and Frequency: Shorter wavelength = higher frequency.

• Hue: Color term; amplitude correlates with brightness/loudness.

Anatomy and Function of the Eye

• Retina: Processes visual information.

• Blind Spot: Area where the optic nerve meets the retina.

• Lens: Focuses images on the retina.

• Visual Impairments: Myopia and hyperopia specifics.

• Rods: Night vision and black/white perception.

Questions & Discussion

• Q: Can those with synesthesia actually see colors?

• A: Yes, they experience actual perceptual stimulation linking sound and color.