Foundations of Psychology: Key Concepts and Study Guide

Psychology Science

Introduction to Psychology

Psychology is the scientific study of behavior and mental processes. It seeks to understand individuals and groups by establishing general principles and researching specific cases.

• What is psychology: The discipline focused on understanding mind, behavior, and mental processes.

• Scientific Method: A systematic approach to research involving observation, hypothesis formation, experimentation, and analysis.

• Biopsychosocial Model: Explains behavior through biological, psychological, and social factors.

• Empiricism and Determinism: Empiricism emphasizes observation and experience; determinism suggests behavior is caused by preceding factors.

• Phrenology: An outdated theory that claimed personality traits could be determined by the shape of the skull.

• Nature/Nurture: The debate over the relative contributions of genetics (nature) and environment (nurture) to behavior.

• Behaviourism: Focuses on observable behaviors and their environmental determinants.

• Cognitive psychology: Studies mental processes such as perception, memory, and problem-solving.

• Humanistic psychology: Emphasizes personal growth and self-actualization.

Big Thinkers in Psychology

Several key figures have shaped the field of psychology. Their contributions are foundational to understanding psychological science.

• Fechner: Founder of psychophysics, studied the relationship between stimuli and perception.

• Darwin: Introduced evolutionary theory, influencing comparative psychology.

• Freud: Developed psychoanalysis, focusing on unconscious processes.

• Wundt: Established the first psychology laboratory, considered the father of experimental psychology.

• James: Promoted functionalism, studying the purpose of consciousness.

• Pavlov: Known for classical conditioning experiments with dogs.

• Skinner: Developed operant conditioning, emphasizing reinforcement and punishment.

• Watson: Advocated for behaviorism, focusing on observable behavior.

• Rogers: Humanistic psychologist, developed client-centered therapy.

• Hebb: Proposed the theory of neural networks and learning.

• Penfield: Neurosurgeon who mapped the brain's functions.

Research Methods in Psychology

Scientific Research Principles

Research in psychology relies on rigorous scientific methods to ensure validity and reliability.

• Basic and applied research: Basic research seeks fundamental knowledge; applied research aims to solve practical problems.

• Five characteristics of quality scientific research: Objectivity, generalizability, reliability, validity, and ethical standards.

• Objectivity and subjectivity: Objectivity involves unbiased observation; subjectivity includes personal perspectives.

• Generalizability: The extent to which findings apply to broader populations.

• Informed Consent: Participants must be informed about the study and consent to participate.

• Hypothesis: A testable prediction about the relationship between variables.

• Variables: Elements that can change or be manipulated in research (independent and dependent variables).

• Operational definition: Specifies how variables are measured or manipulated.

• Reliability and validity: Reliability refers to consistency; validity refers to accuracy of measurement.

• Sources of bias: Factors that can distort research findings (e.g., experimenter bias, sampling bias).

• Single-blind and double-blind studies: Single-blind: participants unaware of group assignment; double-blind: both participants and researchers unaware.

• Different types of research design: Quantitative (numerical data) and qualitative (descriptive data).

Descriptive Statistics

• Frequency: Number of occurrences of a value.

• Normal and skewed distribution: Normal distribution is symmetrical; skewed distribution is asymmetrical.

• Central tendency: Measures that describe the center of a data set (mean, median, mode).

• Mean, median, mode: Mean is the average, median is the middle value, mode is the most frequent value.

Formula for Mean:

$\text{Mean} = \frac{\sum x_i}{n}$

Formula for Median:

$\text{Median} = \text{Middle value of ordered data}$

Formula for Mode:

$\text{Mode} = \text{Most frequent value}$

Biological Psychology

Genetic Basis of Behaviour

Biological psychology explores how genetics and the nervous system influence behavior.

• Principles of Hereditary Transmission: Traits are passed from parents to offspring through chromosomes, genes, DNA, and alleles.

• Chromosomes: Structures containing DNA; humans have 23 pairs.

• Genes: Segments of DNA that code for proteins and traits.

• Alleles: Different forms of a gene.

• Dominant vs. recessive: Dominant alleles mask recessive ones in expression.

• Epigenetics: Study of changes in gene expression without altering DNA sequence.

• Methylation: Chemical modification affecting gene activity.

• Genotype and phenotype: Genotype is genetic makeup; phenotype is observable traits.

• Behavioural genetics: Examines genetic and environmental influences on behavior.

Neurobiological Basis of Behaviour

• 3 main functions of the nervous system: Sensory input, integration, motor output.

• Central and peripheral nervous system: Central: brain and spinal cord; Peripheral: all other nerves.

• Somatic nervous system: Controls voluntary movements.

• Autonomic nervous system: Regulates involuntary functions; includes sympathetic (arousal) and parasympathetic (calming) systems.

• Neurons and glial cells: Neurons transmit signals; glial cells support neurons.

• Dendrite and synapse/synaptic cleft: Dendrites receive signals; synapse is the gap between neurons.

• Neurotransmitters: Chemical messengers in the brain (e.g., dopamine, serotonin).

• Action potential: Electrical impulse that travels along a neuron.

• Endocrine system: Glands that secrete hormones affecting behavior.

• Neuroplasticity: The brain's ability to change and adapt.

Sensation and Perception

Processes and Theories

Sensation is the detection of stimuli; perception is the interpretation of those stimuli.

• Sensation and perception: Sensation is input from the environment; perception is how the brain interprets it.

• Psychophysics: Study of the relationship between physical stimuli and psychological experience.

• Weber and Webber's Law: The just noticeable difference (JND) is proportional to the magnitude of the stimulus.

• Signal detection theory: Explains how stimuli are detected under uncertainty.

• Transduction: Conversion of physical energy into neural signals.

• Sensory adaptation: Reduced sensitivity to constant stimuli.

• Subliminal information processing: Processing below the threshold of conscious awareness.

• Gestalt principles: Rules for organizing sensory information (e.g., figure-ground, proximity, similarity).

• Perceptual consistency: Perceiving objects as stable despite changes in sensory input.

• Bottom-up and top-down processing: Bottom-up: data-driven; top-down: influenced by expectations.

• Influence on processing – attention: Attention determines what information is processed.

Visual System

• Structure of the eye: Includes cornea, lens, retina, and optic nerve.

• Myopia and hyperopia: Nearsightedness and farsightedness, respectively.

• Rods and cones: Photoreceptors for low light (rods) and color vision (cones).

• Pathway of sensory information: From retina to occipital lobe for visual processing.

Auditory System

• Frequency: Number of sound waves per second (measured in Hertz).

• Amplitude: Height of sound waves (loudness).

• Pitch: Perceived frequency of sound.

• Timbre: Quality of sound.

• Decibel: Unit of sound intensity.

• Outer ear, middle ear, inner ear: Structures for collecting, amplifying, and transducing sound.

• Cochlea: Inner ear structure for hearing.

Vestibular System

• Vestibular system: Senses balance and spatial orientation.

Somatosensory System

• Senses of touch and pain: Mechanoreceptors and nociceptors detect pressure and pain.

• Acute vs. chronic pain: Acute is short-term; chronic is long-lasting.

• Role of brain in pain: Brain processes and modulates pain signals.

Other Senses

• Sense of smell: Olfactory receptors detect airborne chemicals.

• Sense of taste: Taste buds detect sweet, sour, salty, bitter, umami.

• Olfactory and gustatory perception: Smell and taste combine for flavor perception.

Research Design	Description
Quantitative	Uses numerical data and statistical analysis
Qualitative	Uses descriptive data, interviews, and observations

Measure	Definition	Formula
Mean	Average value	$\text{Mean} = \frac{\sum x_i}{n}$
Median	Middle value	$\text{Median} = \text{Middle value of ordered data}$
Mode	Most frequent value	$\text{Mode} = \text{Most frequent value}$

Additional info: Some explanations and definitions have been expanded for clarity and completeness. The tables summarize research design types and measures of central tendency for quick reference.