What is the lateral hypothalamus responsible for?
The lateral hypothalamus (LH), also called the lateral hypothalamic area (LHA), contains the primary orexinergic nucleus within the hypothalamus that widely projects throughout the nervous system; this system of neurons mediates an array of cognitive and physical processes, such as
promoting feeding behavior and
...
What happened over time to the rats who had their lateral hypothalamus destroyed quizlet?
What happened over time to the rats who had their ventromedial hypothalamus destroyed?
They ate more food at first but their eating pattern stabilized.
What happens if the lateral hypothalamus is damaged?
The lateral hypothalamus or lateral hypothalamic area is a part of the hypothalamus. It includes the lateral hypothalamic feeding centre which is important in regulating appetite and hunger. Damage to this area
can cause reduced food intake and lateral hypothalamic syndrome
.
What is the purpose of the lateral hypothalamus quizlet?
The lateral hypothalamus is the
“on switch” for eating
, while the ventromedial hypothalamus is the “off switch.” A lesion to the latter would cause obesity and death from overeating, while a lesion to the former will lead to decreased hunger drive.
What happened to the rat with lesion damage to the ventromedial hypothalamus?
A lesion to the VMH makes
rats overproduce leptin, which they cannot respond to causing them to over eat
, leading to obesity.
What two actions result in an increase of a rat’s food intake?
What two actions result in an INCREASE of a rat’s food intake?
stimulating the lateral hypothalamus and destroying the ventromedial hypothalamus.
What is lateral hypothalamus in psychology?
lateral hypothalamus (LH)
the region of the hypothalamus that may be involved in the regulation of eating
. Lesions of the lateral hypothalamus in animals result in fasting and weight loss. Stimulation of that part of the brain increases food intake.
What is the ventral hypothalamus?
The ventromedial hypothalamus is a
small piece of the hypothalamus in the brain
with a large range of functions that include: sexual activity appetite suppression, fear responses, and regulation of temperature.
When was the Cannon Bard theory established?
The theory was developed in
1927
by Walter B. Cannon and his graduate student, Philip Bard. It was established as an alternative to the James-Lange theory of emotion. This theory states that feelings are the result of physical reactions to a stimulating event.
What is anterior hypothalamus?
The anterior hypothalamic nucleus is
a nucleus of the hypothalamus
. Its function is thermoregulation (cooling) of the body. Damage or destruction of this nucleus causes hyperthermia. The anterior hypothalamus plays a role in regulating sleep. The anterior hypothalamic region is sometimes grouped with the preoptic area.
What does the drive reduction theory fail to explain?
Another major criticism of the drive reduction theory of learning is that it does not explain why
people engage in behaviors that do not reduce drives
. For example, people often eat when they’re not hungry or drink when they’re not thirsty. ... Drive-reduction theory cannot account for such behaviors.
What effect does damage to the ventromedial hypothalamus have on eating?
Damage to the lateral hypothalamus
causes an animal to refuse food and water
. The ventromedial hypothalamus (VHM) regulates eating. And stimulates overeating and weight gain. You just studied 45 terms!
How does the hypothalamus regulate body temperature?
When your hypothalamus senses that you’re too hot,
it sends signals to your sweat glands to make you sweat and cool you off
. When the hypothalamus senses that you’re too cold, it sends signals to your muscles that make your shiver and create warmth. This is called maintaining homeostasis.
How does the hypothalamus get damaged?
The most common causes of hypothalamic diseases are
injuries to the head that impact
the hypothalamus. Surgeries, radiation, and tumors can also cause disease in the hypothalamus. Some hypothalamic diseases have a genetic link to hypothalamic disease.
Why did mammals evolve a body temperature of 37 degrees Celsius?
Why did mammals evolve a body temperature of 37 degrees Celsius?
They benefit from being as warm as possible and as fast as possible
.
What happens if the hypothalamus is removed?
It can lead to
disorders of energy balance and thermoregulation
, disorganised body rhythms, (insomnia) and symptoms of pituitary deficiency due to loss of hypothalamic control.
What is one reason why animals with a lesion in the lateral hypothalamus eat so little quizlet?
What is one reason why animals with a lesion in the lateral hypothalamus eat so little?
They experience a decreased cortical response to the smell and sight of food
. All the food they eat is immediately converted into fat storage. They are constantly active and over-responsive to sensory stimuli.
What effect does damage to the ventromedial hypothalamus have on eating quizlet?
Ventromedial Hypothalamus (VMH): stops eating behavior.
Damage causes overeating
. Paraventricular Nucleus: helps regulate blood sugar by stimulating/reducing appetite. Neuropeptide Y stimulates hunger, GLP-1 ceases eating.
What is the difference between lateral hypothalamus and ventromedial hypothalamus?
The lateral hypothalamus responds to any internal or external stimulation that causes you to feel hungry. Once you’ve eaten, the ventromedial hypothalamus sends signals telling you when you’re feeling full and have had
enough food
. ... When you eat, your stomach waits to be filled by that same amount of food.
What is the function of the ventromedial and ventrolateral hypothalamus?
The ventromedial nucleus of the hypothalamus (VMH) is important in
the regulation of female sexual behavior, feeding, energy balance, and cardiovascular function
. It is a highly conserved nucleus across species and a good model for studying neuronal organization into nuclei.
What role does the ventromedial hypothalamus play in feeding?
VMH is designated as the
principal satiety center governing feeding behavior
. ... Neuronal pathways between these nuclei are organized into a complex network in which orexigenic and anorexigenic circuits influence food intake and energy expenditure.
How do rats digest food?
Rat Duodenum Tissue Sections
Once matter is passed from the stomach to the duodenum, it is exposed to
bile and digestive juices
. These substances, which aid in food digestion, are released into duodenum via the hepatopancreatic duct.
Why do rats need nutrients?
Rats feed mainly at dawn/dusk, and
drink mostly during the night
. Food in open bowls – allows them to carry food and handle/eat it wherever they want. Check for uneaten food before re-filling bowls. Use ceramic rather than metal bowls to avoid ultrasound noise.
Is the hypothalamus bilateral?
The hypothalamus is
a bilateral collection of nuclei
divided into three zones surrounding the third ventricle and the mammillary bodies. Generally, the periventricular zone nuclei regulate the endocrine system, and the medial and lateral nuclei regulate autonomic and somatic behavior.
How do the anterior hypothalamus and posterior hypothalamus differ in function?
CENTRAL REGULATION. The
anterior hypothalamus is responsible for the integration of the afferent thermal information
, whereas the posterior hypothalamus controls the descending pathways to the effectors.
What lobe is hypothalamus in?
|
•
Frontal lobe
|
• Temporal lobe
|
What is the mode of feeding of rat?
|
Animals Food Consumed Mode of Food Intake
|
Snakes Rats Swallowing
|
Frogs Insects Swallowing (Sticky Tongue)
|
Earthworm Decaying Matter Swallowing (Muscular Pharynx)
|
Spiders Insects Grinding
|
Is the arcuate nucleus in the lateral hypothalamus?
In the hypothalamus, both the
arcuate nucleus
(Arc) and the lateral hypothalamic area (LHA) show high expression of CART and play a central role in a variety of homeostatic functions, including the regulation of energy homeostasis (Lau and Herzog, 2014).
Which region of the hypothalamus produces Hyperphagia?
Early researchers found that
lesions of the ventromedial hypothalamus (VMH)
resulted in hyperphagia and obesity in a variety of species including humans, which led them to designate the VMH as the brain’s “satiety center.” Many researchers later dismissed a role for the VMH in feeding behavior when Gold claimed that ...
What is posterior hypothalamus?
The posterior nucleus of the hypothalamus is
one of the many nuclei that make up the hypothalamic region of the brain
. Its functions include elevation of blood pressure, pupillary dilation, and shivering or body heat conservation (thermoregulation). Damage or destruction of this nucleus causes hypothermia.
What are the parts of the hypothalamus?
The hypothalamus is divided into 3 regions (
supraoptic, tuberal, mammillary
) in a parasagittal plane, indicating location anterior-posterior; and 3 areas (periventricular, medial, lateral) in the coronal plane, indicating location medial-lateral. Hypothalamic nuclei are located within these specific regions and areas.
Is the Cannon-Bard theory correct?
The James-Lange theory was the dominant theory of emotion at the time, but Harvard physiologist Walter Cannon and his doctoral student Philip
Bard felt that the theory did not accurately reflect how emotional experiences take place
.
Why is the Cannon-Bard theory called the Cannon-Bard theory?
The Cannon-Bard theory of emotion was developed in the 1920s by Walter Cannon and Philip Bard as
a response to the
James-Lange theory of emotion. According to Cannon, a brain region known as the thalamus is responsible for responding to potentially emotional events.
How does the Cannon-Bard theory relate to the James-Lange theory?
The Cannon-Bard theory proposes
that emotions and arousal occur at the same time
. The James-Lange theory proposes the emotion is the result of arousal. ... This approach proposes that the arousal and the emotion are not independent, but rather that the emotion depends on the arousal.
What is drive reduction theory?
A
theory of motivation developed by Clark L. Hull
, the Drive-Reduction Theory focuses on how motivation originates from biological needs or drives. In this theory, Hull proposed a person’s behaviour is an external display of his desire to satisfy his physical deficiencies.
What is the drive reduction theory quizlet?
Drive Reduction Theory. – States
that our behavior is motivated by biological needs
. – A need is one of our requirements for survival (e.g., food, water, shelter). – A drive is our impulse to act in a way that satisfies this need. – Our body seeks homeostasis, a balanced internal state.
What is an example of drive reduction theory?
For example, a person has come to know that if he
or she eats when hungry
, it will eliminate that negative feeling of hunger, or if they drink when thirsty, it will eliminate that negative feeling of thirst. Drive Reduction Theory works well for simple matters- you get hungry, you seek food.
