Foundations of Psychology: Key Concepts and Biological Bases

Psychology Science: Introduction and Key Concepts

What is Psychology?

Psychology is the scientific study of behavior and mental processes. It seeks to understand how individuals think, feel, and act both individually and in groups.

• Definition: The discipline concerned with behavior and mental processes, and how they are affected by an organism’s physical state, mental state, and external environment.

• Applications: Clinical, counseling, educational, industrial/organizational, and research settings.

Scientific Method in Psychology

The scientific method is a systematic approach to research that involves formulating hypotheses, collecting data, and drawing conclusions.

• Steps: Observation, hypothesis formation, experimentation, analysis, and conclusion.

• Importance: Ensures objectivity and replicability in psychological research.

Biopsychosocial Model

This model explains behavior as a result of the interaction between biological, psychological, and social factors.

• Biological: Genetics, neurochemistry, brain structure.

• Psychological: Emotions, thoughts, behaviors.

• Social: Culture, family, socioeconomic status.

Empiricism and Determinism

• Empiricism: The view that knowledge comes from experience and observation.

• Determinism: The belief that all events, including human actions, are determined by causes external to the will.

Phrenology

An outdated theory that claimed personality traits could be determined by the shape of the skull.

Nature vs. Nurture

This debate concerns the relative importance of genetic inheritance (nature) and environmental factors (nurture) in determining behavior.

Major Schools of Thought

• Behaviourism: Focuses on observable behaviors and the ways they are learned.

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

• Humanistic Psychology: Emphasizes individual potential and self-actualization.

Big Thinkers in Psychology

Know the contributions of the following figures:

• Fechner: Founder of psychophysics.

• Darwin: Theory of evolution and natural selection.

• Freud: Psychoanalysis and the unconscious mind.

• Wundt: Established the first psychology laboratory.

• James: Functionalism.

• Pavlov: Classical conditioning.

• Skinner: Operant conditioning.

• Watson: Behaviorism.

• Rogers: Humanistic psychology.

• Hebb: Neuropsychology, "cells that fire together wire together".

• Penfield: Brain mapping through electrical stimulation.

Research Methods in Psychology

Types of Research

• Basic Research: Seeks to increase scientific knowledge.

• Applied Research: Solves practical problems.

Characteristics of Quality Scientific Research

• Objectivity and subjectivity

• Generalizability

• Informed consent

• Hypothesis

• Variables

• Operational definition

• Reliability and validity

• Sources of bias

• Single-blind and double-blind studies

Research Design

• Quantitative Research: Involves numerical data and statistical analysis.

• Qualitative Research: Involves non-numerical data, such as interviews and observations.

Descriptive Statistics

• Frequency: How often a value occurs.

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

• Central Tendency: Measures include mean, median, and mode.

Measure	Definition
Mean	Arithmetic average
Median	Middle value in a data set
Mode	Most frequently occurring value

Biological Psychology

Heredity and Genetics

• Principles of Hereditary Transmission:

  • Chromosomes

  • Genes

  • DNA

  • Alleles

• Behavioral Genomics: Study of how genes influence behavior.

• Dominant vs. Recessive: Dominant alleles mask the effect of recessive alleles.

• Epigenetics: Study of changes in gene expression not caused by changes in DNA sequence.

• Methylation: A process that can change gene activity without changing the DNA sequence.

• Genotype: Genetic makeup of an individual.

• Phenotype: Observable characteristics.

• Behavioral Genetics: Study of genetic and environmental influences on behavior.

Neurobiological Basis of Behavior

• Main Functions of the Nervous System: Sensory input, integration, and motor output.

• Central and Peripheral Nervous System:

  • Central: Brain and spinal cord

  • Peripheral: All other neural elements

• Somatic and Autonomic Nervous System:

  • Somatic: Controls voluntary movements

  • Autonomic: Controls involuntary functions

  • Sympathetic: Prepares body for action

  • Parasympathetic: Calms the body

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

• Dendrite and Synapse/Synaptic Cleft: Dendrites receive signals; synapses are gaps between neurons.

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

• Action Potential: Electrical impulse that travels down a neuron.

• Endocrine System: Glands that secrete hormones affecting behavior and physiology.

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

Sensation and Perception

Basic Concepts

• Sensation: Detection of physical energy by sense organs.

• Perception: Interpretation of sensory information.

• Psychophysics: Study of the relationship between physical stimuli and perception (Weber and Fechner's Law).

• Absolute Threshold: Minimum stimulation needed to detect a stimulus.

• Difference Threshold (Just Noticeable Difference): Smallest difference detectable between two stimuli.

• Signal Detection Theory: Predicts how and when we detect the presence of a faint stimulus.

• Transduction: Conversion of physical energy into neural signals.

• Sensory Adaptation: Diminished sensitivity to constant stimulation.

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

• Gestalt Principles: Rules describing how we organize sensory input (e.g., figure-ground, proximity, similarity).

• Perceptual Constancy: Perceiving objects as unchanging despite changes in sensory input.

• Bottom-up and Top-down Processing: Bottom-up: data-driven; Top-down: concept-driven.

• Attention: Focusing mental resources on specific information.

Visual System

• Structure of the Eye: Cornea, lens, retina, optic nerve.

• Myopia and Hyperopia: Nearsightedness and farsightedness.

• Rods and Cones: Photoreceptor cells for low light and color vision, respectively.

• Pathway: Sensory information travels from the retina to the occipital lobe.

Auditory System

• Frequency, Amplitude, Pitch, Timbre: Properties of sound waves.

• Decibel: Unit of sound intensity.

• Outer, Middle, Inner Ear: Structures involved in hearing; cochlea is the main organ of hearing.

Vestibular System

• Responsible for balance and spatial orientation.

Somatosensory System

• Senses: Touch, pain, temperature.

• Pain: Acute (short-term) vs. chronic (long-term).

• Role of Brain: Processes pain signals.

Chemical Senses

• Taste: Detected by taste buds.

• Smell: Detected by olfactory receptors.

Additional info: Some content was expanded for clarity and completeness, including definitions, examples, and brief explanations of key terms and processes.