Human Development: Infancy Through Adolescence

A set of 50 vocabulary flashcards covering human physical, cognitive, socioemotional, and linguistic development from infancy through adolescence.

Cephalocaudal Pattern

A directional principle of physical growth where development and structural differentiation proceed from top to bottom, resulting in the head, brain, and cranial structures maturing earlier and more rapidly than the lower extremities and torso.

Proximodistal Pattern

A directional principle of physical growth where development begins at the anatomical core and radiates outward, establishing muscular control of the trunk and chest before refined control over the arms, hands, legs, and feet.

Rooting Reflex

A survival reflex elicited by gently stroking an infant's cheek or the corner of their mouth, causing them to turn their head toward the touched side and open their mouth to facilitate nipple acquisition.

Sucking Reflex

An automatic infant reflex elicited when an object or nipple is placed in the mouth, initiating rhythmic sucking that enables nutritional intake and functions as a mechanism for self-regulation.

Sticky Mittens Experiment

An experimental intervention in which infants wear mittens with Velcro palms to grasp Velcro-covered objects before developing independent pincer grasping, demonstrating that fine motor skill acquisition can be actively accelerated to foster cognitive exploration.

Visual Preference Method

A research methodology measuring whether infants spend significantly more time orienting toward one visual stimulus over another, revealing innate biases toward structured images like human faces rather than plain discs.

Habituation

A decrease in behavioral responsiveness to a stimulus following repeated, familiar, or predictable presentations.

Dishabituation

The recovery or increase in responsiveness following the introduction of a novel or altered stimulus, demonstrating an infant's capacity for sensory discrimination.

Experience-Expectant Development

A neurodevelopmental process in which normal cortical wiring depends on receiving species-typical environmental input during an early sensitive period, as illustrated by rapid visual improvements following early cataract removal.

Perceptual Narrowing

A developmental process wherein broad discriminatory capacities present early in life become specialized based on specific ecological exposure, resulting in the loss of unused discriminatory abilities (e.g., losing the ability to distinguish individual monkey faces between $6$ and $9$ months of age).

Intermodal Perception

The capacity to integrate and coordinate perceptual information simultaneously across two or more distinct sensory modalities, such as pairing visual lip movements with auditory speech sounds.

Schema

In Piaget's theory, an internalized, structured cognitive representation or operational framework used to interpret, organize, and categorize environmental experiences.

Assimilation

The cognitive process of incorporating new environmental information or objects into preexisting cognitive schemas without modifying the underlying structure of the schema.

Accommodation

The cognitive process of modifying existing schemas or creating entirely new cognitive schemas when novel environmental information cannot be reconciled with existing models.

Sensorimotor Stage

Piaget's first developmental stage, spanning birth through approximately $2$ years of age, during which infants construct an understanding of the external physical world by coordinating sensory impressions with motor actions.

Object Permanence

The Piagetian cognitive understanding that objects, persons, and physical entities continue to exist even when they are removed from direct visual, tactile, or auditory perception.

A-not-B Error

An infantile search error wherein an infant searches for a hidden toy at location A where it was previously retrieved, even after observing an experimenter move the toy to location B, reflecting immature prefrontal inhibitory circuitry.

Rovee-Collier Mobile Conjugate Reinforcement Paradigm

An experimental procedure demonstrating operant conditioning and retention in infants aged $2.5$ months, where kicking tethered to an overhead mobile increases in frequency and is selectively recalled after a $2$-week delay.

Short Lookers

Infants characterized by rapid visual processing, swift habituation, and efficient visual feature extraction who demonstrate pronounced novelty preferences and superior long-term cognitive efficiency.

Joint Attention

An interactive process in which two individuals consciously and simultaneously coordinate their visual focus onto the identical external object or environmental event.

Deferred Imitation

The cognitive capacity to reproduce a novel modeled behavior after a temporal delay, facilitated by verbal cues, motor milestones, and sleep consolidation.

Phonemes

The fundamental, elemental phonetic units of sound that differentiate words from one another within a spoken language.

Infant-Directed Speech (IDS)

A speech register used by caregivers characterized acoustically by high pitch, slowed tempo, exaggerated intonations, simplified lexical choices, and repetitive phrasing.

Recasting

A linguistic facilitation technique where an adult rephrases an incomplete or ungrammatical child utterance into a grammatically correct question.

Expanding

A caregiver linguistic technique of restating a child's basic statement while adding sophisticated grammatical structure and elaboration.

Primary Emotions

Universal affective expressions evident within the first $6$ months of life, including surprise, interest, joy, anger, sadness, fear, and disgust.

Self-Conscious Emotions

Emotions that emerge during the second year of life requiring self-awareness and an understanding of others, including empathy, jealousy, embarrassment, pride, shame, and guilt.

Social Smile

An intentional, purposeful smile elicited directly in response to external social visual stimuli, such as a caregiver's face, emerging around $2$ months of age.

Stranger Anxiety

An infantile fear manifestation characterized by wariness and behavioral avoidance in the presence of unfamiliar adults, emerging around $6$ months and peaking between $6$ and $8$ months of age.

Separation Protest

Distressed crying and searching behavior elicited when a primary attachment figure departs, typically peaking between $13$ and $15$ months of age.

Social Referencing

The developmental capacity emerging around $12$ months of age where infants read the emotional and facial cues of caregivers to interpret ambiguous events and guide their own behavioral responses.

Behavioral Inhibition

Kagan's temperamental classification identifying children who react to unfamiliar environments, objects, or individuals with initial avoidance, physiological distress, or subdued affect.

Effortful Control

Rothbart and Bates' temperamental dimension involving the voluntary capacity to inhibit a dominant, automatic behavioral response in favor of an adaptive, subdominant response.

Secure Attachment

An Ainsworth attachment classification where an infant uses the caregiver as a secure base for exploration, protests departure, but is readily comforted upon reunion and quickly resumes play.

Insecure Avoidant Attachment

An attachment style where an infant shows little interactive engagement with the caregiver, exhibits minimal distress upon departure, and actively avoids contact or looks away upon reunion.

Insecure Resistant Attachment

An attachment style where an infant clings anxiously, fails to explore toys, becomes intensely distressed upon separation, and displays contradictory reunion behaviors such as seeking contact while aggressively kicking or pushing away.

Insecure Disorganized Attachment

An attachment classification characterized by dazed, confused, or fearful behavior, such as freezing in the caregiver's presence, often reflecting relational trauma or unpredictable caregiving.

Developmental Coordination Disorder (DCD)

A condition affecting approximately $5\text{--}6\%$ of children, characterized by chronic deficits in motor balance, physical coordination, and spatial execution that disrupt activities of daily living.

Preoperational Stage

Piaget's second cognitive stage, spanning ages $2$ to $7$ years, where children develop symbolic thought but lack reversible mental operations, exhibiting egocentrism, animism, and centration.

Centration

The tendency of preoperational children to focus visual attention on a single, salient dimension of an object or event while completely ignoring all other relevant dimensions.

Seriation

The concrete operational ability to order physical stimuli along an objective quantitative continuum, such as arranging sticks in order of increasing length.

Zone of Proximal Development (ZPD)

Vygotsky's concept defining the structural gap between what a child can achieve independently and what they can accomplish under the guidance and collaboration of a more skilled partner.

Scaffolding

The dynamic pedagogical process of tailoring instructional support to match a learner's current competence level, gradually withdrawing assistance as independent mastery is achieved.

Theory of Mind (ToM)

The developmental awareness that one's own mind and the minds of others hold distinct beliefs, desires, perspectives, and knowledge that differ from objective reality.

Relational Aggression

A form of indirect aggression that inflicts harm by manipulating interpersonal relationships, enforcing social exclusion, or disseminating malicious rumors.

Authoritative Parenting

Baumrind's parenting typology characterized by high demandingness paired with high responsiveness, establishing clear behavioral boundaries while maintaining warmth, open dialogue, and emotional support.

Regular Family Meals

A protective family routine and environmental buffer shown to significantly lower the risk of adolescent substance abuse.

Conversion Therapy

Coercive practices aimed at altering an individual's sexual orientation or gender expression, made entirely illegal under Canadian criminal law in January $2022$.

Anorexia Nervosa

A life-threatening eating disorder defined by the relentless pursuit of extreme thinness through self-starvation, resulting in body weight below $85\%$ of normal, intense fear of gaining weight, and distorted body image.

Adolescent Egocentrism

A state of heightened self-consciousness characteristic of adolescence that manifests in cognitive distortions including the imaginary audience and the personal fable.