Module 1: Introduction to Cognitive Psychology

Memory

Memory is the mental process of acquiring, retaining, and retrieving information for later use. It involves a complex storage system that is continually updated and never reaches capacity. The more memories one has, the easier it becomes to acquire new ones.

• Definition: The mental process of acquiring and retaining information for later retrieval.

• Properties: Memory capacity is virtually limitless; prior memories facilitate new learning.

• Example: Learning a new language is easier if you already know several others.

Cognition

Cognition encompasses the mental processes and activities used to perceive, learn, remember, think, and understand. In essence, cognition is thought, including processes such as recognition, concept formation, and language use.

• Definition: The collection of mental processes involved in acquiring knowledge and understanding through thought, experience, and the senses.

• Key Processes: Recognition, concept formation, language, problem-solving.

Cognitive Psychology

Cognitive psychology is the scientific study of how people perceive, learn, remember, and think about information. It investigates the internal mental processes that underlie behavior.

• Focus: Perception, learning, memory, and thinking.

Reaction Time (RT) in Cognitive Psychology

Reaction time is a common dependent variable in cognitive psychology and serves as a proxy for the difficulty of a cognitive task. For example, answering simple arithmetic questions takes less time than more complex ones, reflecting differences in encoding, retrieval, and response processes.

• Example: An average college student takes 700 ms to answer 2 x 3, but 1016 ms for 9 x 6.

Methodologies in Cognitive Psychology

Cognitive psychology employs various research methodologies to study mental processes:

• Controlled Laboratory Experiments: Highly controlled settings to isolate variables.

• Psychobiological Research: Examines the biological basis of cognition.

• Self-Reports and Self-Ratings: Participants describe their own experiences.

• Case Studies: In-depth analysis of individuals or groups.

• Naturalistic Observations: Observing behavior in real-world settings.

• Computer Simulations and Artificial Intelligence: Modeling cognitive processes using computers.

Rationalism vs. Empiricism

Two major philosophical approaches to knowledge:

• Rationalists: Believe truth is achieved through logical analysis and reasoning (e.g., Plato, Descartes).

• Empiricists: Believe knowledge comes from sensory experience and observation (e.g., Aristotle, Locke).

• Kant: Argued both approaches are necessary for understanding truth.

Historical Schools of Thought

• Structuralism: Wundt and Titchener sought to understand the structure of the mind through introspection.

• Functionalism: William James focused on the functions of mental processes.

• Associationism: Ebbinghaus, Thorndike, and Pavlov studied how associations form learning.

• Behaviorism: Watson and Skinner emphasized observable behavior and classical conditioning.

• Cognitivism: Emphasizes understanding mental processes to explain behavior.

Information Processing Model

This model conceptualizes cognition as a sequence of stages through which information passes:

• Cognition can be understood as a set of sequential stages.

• Each stage has a unique process for information.

• Information is passed from one stage to the next.

Parallel Distributed Processing (PDP)

PDP models explain mental functions as the result of simultaneous electrical activity across large networks of interconnected, neuron-like units, aligning with physiological models of cognition.

Module 2: Cognitive Neuroscience

Cognitive Neuroscience

Cognitive neuroscience links the brain and nervous system to cognitive processing and behavior. It explores how brain structures and functions underlie mental processes.

Localization of Function

Localization of function refers to the idea that specific brain regions are responsible for particular functions. This concept is crucial for medical diagnosis and understanding brain-behavior relationships.

The Nervous System

The nervous system is a complex network of nerves and cells that transmit signals throughout the body, controlling bodily functions, movements, and mental activities.

Neurons

Neurons are the fundamental units of the nervous system, responsible for transmitting information via electrical and chemical signals.

• Parts of a Neuron: Soma (cell body), dendrites, axon, terminal buttons.

• Myelinated vs. Unmyelinated Axons: Myelinated axons conduct signals faster and are found where speed is essential (e.g., motor neurons), while unmyelinated axons are found where speed is less critical (e.g., smooth muscle).

• Nodes of Ranvier: Gaps in the myelin sheath that facilitate rapid signal transmission.

• Multiple Sclerosis: Caused by immune system attacks on myelin.

Neurotransmission

Neurotransmission is the process by which neurons communicate via electrical impulses (action potentials) and chemical messengers (neurotransmitters) across synapses.

• Action Potential: The firing of a neuron.

• Synapse: The gap between neurons where neurotransmitters are released.

• Excitatory vs. Inhibitory Neurons: Excitatory neurons promote firing; inhibitory neurons suppress it.

Central and Peripheral Nervous Systems

• CNS: Brain and spinal cord; protected by bone and the blood-brain barrier.

• PNS: All other nerves; includes somatic (voluntary movement) and autonomic (involuntary functions) systems.

• Somatic System: Controls voluntary movements and reflexes.

• Autonomic System: Controls involuntary functions; divided into sympathetic (arousing) and parasympathetic (calming) branches.

Brain Structure and Function

• Hindbrain: Medulla (breathing, heartbeat), pons (muscle coordination, sleep), cerebellum (balance).

• Midbrain: Reticular activating system (arousal), superior colliculus (visual orienting), inferior colliculus (auditory orienting), substantia nigra (dopamine production).

• Forebrain: Cerebral cortex, basal ganglia (movement), limbic system (emotion, memory), thalamus (sensory relay), hypothalamus (basic drives).

Cerebral Cortex and Lobes

The cerebral cortex is the outer layer of the brain, responsible for higher-order functions. It is divided into four main lobes:

• Frontal Lobe: Movement, problem-solving, judgment, memory, inhibition.

• Parietal Lobe: Sensory processing, spatial orientation.

• Temporal Lobe: Auditory processing, language, memory.

• Occipital Lobe: Visual processing.

Motor and Sensory Cortex

The primary motor cortex (frontal lobe) controls voluntary movements, while the primary somatosensory cortex (parietal lobe) processes sensory information from the body.

Major Brain Fissures

• Central Fissure (Central Sulcus): Separates the frontal and parietal lobes.

• Lateral Fissure (Sylvian Fissure): Separates the temporal lobe from the frontal and parietal lobes.

• Longitudinal Fissure: Divides the two cerebral hemispheres.

Module 3: Attention, Sensation, and Perception

Attention

Attention is the mental process of focusing on specific information while ignoring other stimuli. It is a limited resource, and humans can only attend to a few things at once.

• Divided Attention: Performing multiple tasks simultaneously (e.g., driving while talking on the phone).

• Selective Attention: Focusing on one stimulus while filtering out others (e.g., the cocktail party effect).

Sensation vs. Perception

• Sensation: Detection of energy from the environment by sensory receptors (e.g., eyes, ears).

• Perception: Interpretation of sensory input by the brain, resulting in meaningful experiences.

Iconic and Echoic Storage

• Iconic Storage: Brief visual memory, lasting about 250 ms.

• Echoic Storage: Brief auditory memory, lasting up to 6 seconds.

Signal Detection Theory

Signal detection theory explains how individuals detect signals amidst noise, resulting in four possible outcomes: hit, miss, false alarm, and correct rejection. Payoffs can influence a person's decision criterion but not their actual sensitivity.

Vigilance and Search

• Vigilance: Sustained attention to detect infrequent signals (e.g., air traffic control).

• Search: Actively looking for a known target among distractors.

Models of Selective Attention

• Broadbent's Filter Model: Only one channel of sensory information passes through a filter at a time.

• Moray's Selective Filter Model: Highly salient information (e.g., one's name) can break through the filter.

• Treisman's Attenuation Model: Unattended information is attenuated (weakened) but not completely blocked.

Attentional Resource Theory

This theory explains how humans allocate a limited pool of cognitive resources when performing tasks, accounting for performance limitations in multitasking.

Inattentional Blindness vs. Change Blindness

• Inattentional Blindness: Failure to notice a visible stimulus when attention is directed elsewhere.

• Change Blindness: Failure to detect changes in a visual scene.