Understanding mental processes and cognitive development

Your experience of the world is shaped by mental processes such as awareness, thinking, remembering, problem solving, decision making, judgment, and communication. These functions don’t develop in isolation. Psychological factors, sociocultural context, and biology all influence how you interpret events and build a sense of “reality.”

Cognitive science studies these processes, including consciousness, cognitive development, problem solving, decision making, intelligence, memory, and language.

Information-processing model

The information-processing model compares the brain to a system that takes in information, interprets it, and stores it for later use. This model helps explain two key ideas:

• You don’t pay attention to everything in the environment; you focus on selected stimuli.
• Some of what you attend to is encoded and stored in memory so it can be used in the future.

Cognitive development and Piaget’s theory

Piaget argued that children actively build mental frameworks - called schemata - to make sense of the world. When children encounter something new, they respond in one of two ways:

• Assimilate new information into existing schemata, or
• Accommodate by adjusting their schemata to incorporate the new data.

Piaget identified four developmental stages:

• Sensorimotor (birth to 2 years): Learning through senses and actions, such as developing object permanence and experiencing stranger anxiety.
• Preoperational (2 to 7 years): Using symbols and language, though still limited by egocentrism and an inability to perform mental operations like conservation.
• Concrete operational (7 to 11 years): Gaining logical thinking about tangible events, mastering conservation and reversibility.
• Formal operational (11 years to adulthood): Developing abstract thinking and the ability to consider hypothetical situations.

Piaget’s stages of cognitive development

Age (years)	Stage	Description	Developmental issues
0-2	Sensorimotor	World experienced through senses and actions	Object permanence Stranger anxiety
2-6	Preoperational	Use words and images to represent things, but lack logical reasoning	Pretend play Egocentrism Language development
7-11	Concrete operational	Understand concrete events and analogies logically; perform arithmetical operations	Conservation Mathematical transformations
12-	Formal operational	Formal operations Utilize abstract reasoning	Abstract logic Moral reasoning

Table adapted from OpenStax

Cognitive changes in adulthood

Many cognitive abilities, including aspects of intelligence, tend to remain relatively stable from early adulthood through the mid-30s to mid-50s. Over time, however, fluid intelligence - which includes reasoning, memory, and information processing - often declines.

This decline is linked in part to gradual changes in brain connections and may also be influenced by reduced physical and mental activity. In some cases, aging is associated with dementia. Alzheimer’s disease is a major example; it involves brain plaques and cell death that can lead to severe cognitive impairment.

Influence of culture and environment

Culture strongly influences how people interpret and organize experience. For example, greetings and everyday social routines vary across cultures. These repeated routines help form cognitive scripts (also called event schemata), which are mental expectations for how events typically unfold.

The nature versus nurture debate also connects to cognitive development. Cognitive outcomes reflect an ongoing interaction between:

• genetic predispositions, and
• environmental factors such as socioeconomic status, education, and parenting style.

Biological underpinnings of cognition

Cognition depends on biological systems in the brain. Two important contributors are the frontal lobe and the limbic system:

• The frontal lobe supports planning, reasoning, and impulse control.
• The limbic system - including the hippocampus, amygdala, and hypothalamus - supports memory, emotion, and basic bodily regulation.

Problem solving and decision making

When you face a challenge, you may use different strategies:

• Trial and error: Trying different approaches until one works.
• Algorithms: Using systematic, step-by-step procedures, often supported by computers.
• Heuristics: Using mental shortcuts based on past experience to make decisions quickly.

These strategies can be affected by common biases and barriers:

• Confirmation bias: Seeking or favoring information that supports existing beliefs.
• Fixation: Getting stuck on one approach and failing to consider alternatives.
• Functional fixedness: Seeing an object as useful only for its typical purpose.

Additional heuristics can further shape judgment and decision making:

• Representative and availability heuristics - tending to connect to conclusions we expect or information that was most recently available
• Belief perseverance - clinging to beliefs despite evidence to the contrary
• Framing - positive or negative presentation of information.

Overall, cognitive processes reflect a combination of mental operations shaped by biological mechanisms, cultural context, and environmental influences. Together, these factors affect how people learn, solve problems, make decisions, and interact with the world.