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Vision von Mind Map: Vision

1. Chemical Control of hunger

1.1. Artificial: Fen-phen (drug developed to try to decrease body weight and hunger)

1.2. Neuropeptide Y (NPY):Released in hypothalamus causing an increase in eating, Increase in hypothalamus=big increase in eating

1.3. Ghrelin: Hormone/Peptide released in stomach and hypothalamus and increase in hunger, Increased hunger signal to brain/hypothalamus, Effective through NPY receptors

1.4. Cholecystokinin (CCK): its job is to induce satiety, released when we are eating, Hormone/Peptide released by stomach, Delayed signal (20-30 min after we have started eating, CCK is released to get us to stop eating), Induces satiety

1.5. Leptin: Hormone/Peptide released from fat tissue, Induces satiety

2. Human eye

2.1. Retina

2.1.1. back part of the eye that allows us to see, light comes through pupil, then lens projects it on the retina

2.2. Part of the Central Nervous System

2.3. Blinspot

2.3.1. spot on your eye where you cannot see. The layer of neurons on the most interior side send info to the brain and the blindspot is where the axons exit the brain

2.4. Fovea

2.4.1. at the very back of the eye, gives us our most acute vision. Has the best eyesight you can have.

2.5. Lens

2.5.1. job is to make sure the object we are looking at is displayed on the retina

2.5.2. Accommodation: the lens changes shape to accommodate to what they are looking at

2.5.3. Glasses assist the lenses to project images to the retina at the back of the eye

3. Hunger

4. Transfer of Visual Input

4.1. Retina of the eye: multiple layers of neurons, information must be convert a lightwave into an action potential

4.2. Three major layers where light wavesa re converted to action potential

4.2.1. Photoreceptors: light must pass through to get to brain; all mammals have these a the back of their eye Cones: activated when there is enough light; better in daylight, give us color vision, clearer vision, 6 million of these Rods: not in the fovea, 120 million, black/whit vision, less well-focused vision

4.2.2. Bipolar cells: specialized for visual processing and transferring info from photoreceptors to ganglion cells

4.2.3. Ganglion cells: normal neurons, their axons form the optic nerve and send information to the brain. This is where the action potential occurs

4.3. 2 additional kinds of cells

4.3.1. Horizontal cells: between photoreceptors and bipolar cells, take information from one part of retina and impact an area in a different part of the retina

4.3.2. Amacrine cells: between bipolar and ganglion cells

5. Neural control of hunger

5.1. Ventromedial hypothalamus (VMH)

5.2. Lateral hypothalamus

5.2.1. Nigrostriatal bundle

5.3. Paraventricular nucleus: involve in hunger and satiety

6. Evolution Rules: adapted to eat fats and sugars

6.1. this is what makes food taste good to us

6.2. we are adapted to eat what is available

6.3. "what the hell" phenomenon

7. Body weight maintenance

7.1. Exercise

7.2. Eat healthy, unprocessed food

7.3. eating and evolution/adaptation

8. Experimental surgery

8.1. Lesions: fried neurons in certain area chemically or electrically

8.2. Stimulation: stimulate the neurons in a certain area chemically or electrically

9. Fuel absorption

9.1. Proteins: amino acids

9.2. Carbohydrates: gluose

9.3. Fats

10. Short-term Reservoir

10.1. Hormones: released as part of endocrine system, ex:// oxytocin: bonding effect

10.2. Endorphins: neuropeptides,, very potent painkillers

11. Sleep

11.1. Stage 1: low voltage EEG, ↓ EMG, looks like beta rhythms, not very different from wake, we distinguish it based on muscle activity, has distinct drop in muscle activity (jaw opening up, headbob of nodding off

11.2. Stage 2: sleep spindles (rapid rhythmic burst), K-complexes (brain REALLY starts to slow down and at higher amplitude), slight ↓ EMG, muscle activity

11.3. Stage 3: between 20 & 50% delta waves of 30 sec epoch, slow wave sleep is taking over (delta waves) muscle activity stays the same as stage 2

11.4. Stage 4: > 50% delta waves in epoch, rhythmic, SLOW responding and high amplitude, slow frequency, muscle activity stays the same as stage 2

11.5. REM: low voltage EEG, ↓ ↓ EMG, last stage of sleep we go into, rapid, make big hourglass shapes on epoch, brain waves are basically awake, it is an awake brain in an asleep body, brain waves change rapidly to stage 4 to awake brain pattern, and a DRAMATIC IMMEDIATE drop in muscle tone/activity

11.5.1. It is dependent on the Pons (locus coeruleus - turns off muscle tone LACK OF MUSCLE TONE and starts muscle twitches) If we damage this, muscle tone does not get turned off when we sleep, we will act out our dreams

11.5.2. we tend to wake up more in REM sleep (especially when we don’t have an alarm clock waking us up)

11.6. NREM: non-REM, every stage of sleep that’s not REM sleep (stage 1, 2, 3, 4)

11.7. SWS: slow wave sleep (stage 3 & 4) not unusual to see these waves collapse together, mostly at the beginning of the night

11.8. Pons - Muscle tone: locus coeruleus, Muscle twitches

11.9. College Student Sleep:

11.9.1. ○ On average sleep 7-7.5 hours on weekdays and 8.5 to 9.5 hours on weekends

11.9.2. Major issue: irregular sleep (1 nap, 3 hours, and 20 min in each class) trains our brain that any time that we are sitting down and comfortable, our brain will try to go to sleep and will induce sleep when you're not supposed to

12. Reproduction

12.1. Genetics of Development

12.1.1. 23 pairs of chromosomes, 23rd set determines gender, female has more genetic material

12.1.2. Focusing on attention and monitoring it is important for this

12.1.3. Dosage compensation: female has more "dose" of genetics; varies from species to species; in most cases, females activate the equivalence of one X; males activate the Y and the X; most of us carry the gene for schizophrenia and it isn't activated, females have extra genetic material but choose what gets activate and seem to choose what is usually better; on every other pair we activate a little bit moms and a little bit of dad's genes, not all genes get activated

12.2. Hormones

12.2.1. Females:as the process occurs in fetus of deciding X and Y, hormones are also created Estrogen – controller and impacts the other hormones and how they are released, can increase aggression (seductress), works with DA, 5-HT, oxytocin ( how female reacts in sexual behavior encounter) Progesterone – allows gestation (allows fetus to develop), counter estrogen by providing calming influence Testosterone – assertive, aggression, sex drive Oxytocin – encourages labor/child birth & lactation; cuddler, empathy, feel good (with DA), reduce stress, increase trust Vasopressin – subtle aggression-masculine tendencies, similar in structure to oxytocin (competitive energy to make sure you and your baby have food)

12.2.2. Males Testosterone – dominant, assertive, competition, aggression, sex drive (highest about 16-18) Vasopressin – Mr. Gallant, monogamy, protect turf/mate/children Oxytocin – encourage cuddling, empathy, reduce stress, increase trust, connection on emotional level Prolactin – Mr. Mom, connections with mate and children, increase parental caring/behavior, decrease sex drive, more caring, improving connections Estrogen – Could be source of power

13. Visual Pathway: right visual field goes to the outer edge of the left eye and vice versa

13.1. Optic nerve

13.2. Optic chiasm: crossover of information

13.3. Lateral geniculate nucleus

13.4. Superior colliculus (midbrain): branches from optic nerve and foes to the back of the brain at the same time as lateral geniculate nucleus

13.5. Primary visual cortex (occipital lobe): starts to process visual information, info is being transferred from lateral geniculate nucleus to the center of all the neurons

14. Visual Perception

14.1. Lamellae: lines of plates that are proteins

14.1.1. Photopigments imbedded within lamella: Opsin: protein, Retinal: fat, Rhodopsin: light sensitive pigments

15. Retina

15.1. Resting conditions: bipolar - hyperpolarized, ganglion: -70 mV

15.2. Light waves-retina: Bleaching of rhodopsin, hyperpolarization of photoreceptors, depolarization of bipolar cells

15.3. Lateral inhibition: allows us to see edges and find objects, inhibits nearby bipolar cells (shuts them down)

15.4. central vs peripheral: central processing in the fovea 1:1:1 ratio, peripheral processing: into multiple bipolar cells to one ganglion

15.5. Color vision: 3 types of cones: short-blue, medium-green, long-red

15.5.1. Trichromatic/compenent theory

15.5.2. Opponent processing theory: negative after-images

15.5.3. Color blindness: X-linked on chromosomes, Red/green is most common, Blue/yellow is rare

16. Visual Processing

16.1. Magnocellular system: all mammals have this; do processing of movement and detect depth; most powerful indication for depth is the difference in view from right eye to left eye

16.2. Parvocellular system: only present in primates, detects fine details, starts color processing

16.3. Dorsal system: guidance of movement, holistic processing, spatial recognition, mirror neurons first discovered here

16.4. Ventral: perceiving actual objects, object recognition, face recognition, fusiform face area

17. Sleep Motivation

17.1. Recuperative factor: the longer you are awake, the more you want to go sleep, we wake up in the morning and the drive to go to sleep immediately starts. Napping will reset this and make us more alert, napping earlier in the day is better

17.2. Circadian factor: when have less sleepiness then increased sleepiness and we will want to go to sleep

17.3. When you stay awake for more than one day, you get both of these

18. Sleep Deprivation

18.1. If you're sleep deprived enough, you will go right into REM (RARE)

18.2. Humans: don't usualy do these studies, everything was perfectly normal after 11 days of no sleep, performance, health and well-being are affected, chronic partial sleep deprivation

18.3. Rat sleep deprivation study done because you can't get long term effects from human study

19. What sleep does for us

19.1. Protein synthesis: Certain types primarily occur at night; so you can't get this from napping during the day

19.2. Memory consolidation/connection

19.3. Immune system; More likely to get sick if you aren't sleeping right, True evidence that the immune system is reset during sleep AT NIGHT

19.4. Heart health: Increased risk of cardiovascular disease and blood pressure if you don't get enough sleep

19.5. Body weight (risk of obesity; react correctly to insulin), deprives us from reacting to insulin like we should to maintain healthy body weight; also when you are awake you are more likely to eat

19.6. Muscle growth; tissue recovery (protein synthesis again), Much of the processing to maintain and increase muscle mass is done at night when we are sleeping

19.7. Reset biological clock; emotions; self-regulation