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Lecture

September 30th, Eating Disorders/Brain Function The brain and its functions espeically when dealing with disorders


Department
Psychology
Course Code
PSYCH101
Professor
Colin Mac Leod

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September, 30th, 2010
PSYCH 101 , #6
Eating Disorders
Anorexia Nervosa: a disorder in which a normal weight person diets and becomes s
ignificantly underweight (15% or more), yet still feels fat and continues to sta
rve
Bulimia: a disorder in which a person has episodes of overeating, usually of hig
h calorie foods, followed by
๎€€
purging
๎€€
(vomiting, laxative, fasting, over-exercising
)
Sensation and Perception
Sensation: the detection of simple properties of stimuli; reception and represen
tation of stimulus energies from the environment
Perception: the processing of meaningful objects and events in the world; organi
zing and interpreting sensory information. Vision, smell, taste, touch, hearing,
sight.
->two aspects of the nervous systems that recognizes these senses.
Psychophysics: the systematic study of the relation between the physical charact
eristics of stimuli and the sensations/experiences that they produce
Absolute threshold: the minimum value of a stimulus that can be detected 50% of
the time
Difference threshold: the minimum detectable difference between two stimuli (a.k
.a the
๎€€
just noticeable difference
๎€€
)
Subliminal Perception
-> the sensing of a stimulus, as indicated by a change in behaviour, at an inten
sity that does not produce conscious awareness (I.e., that is below the absolute
threshold for conscious awareness)
->a still highly controversial phenomenon - is it actually possible? Most eviden
ce suggests
๎€€
no
๎€€
in meaningful settings.
Attention
-> a focusing of perception that leads to greater awareness of a limited number
of (dimensions of) stimuli
->
๎€€
our experience is determined by what we choose to attend to
๎€€
- William James (189
0)
Four Kinds of Attention
->Alerting: the ability to orient oneself to some critical and/or unexpected sti
mulus (detection only)
->Vigilance: the ability to devote full attention to a single stimulus (detectio
n of change)
->selective: focusing on only one stimulus, excluding all others
->divided: focusing on two (or more) stimuli at the same time
-> intentional blindness: unaware to things happening around us
Vision
Physical Characteristics
->transduction: conversion of external stimulus energy into internal neural ener
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