abnormal behavior – Significant behavior differing from the regular behavior of children of the same age.

abnormality – Any deviation from the norm.

adaptation – Adjusting to a new environment or social group.

adaptive skills – The skills which allow adjustment to a certain environment.

affective reaction – A strong to excessively violent emotional reaction

alternative communication – Means of communicating which replace the need for spoken language.

asynchronous development – The development of individual functions and skills at different times.

attachment – Emotional dependency of a child on their mother.

augmentative communication – Systems of communication which support existing, but functionally insufficient communication abilities.

degenerative disease – Illnesses manifesting as a gradual deterioration of outward expression of ability and its reduction.

diffuse brain damage – Widespread, non-focal damage to the brain.

etiological – Relating to the causes behind a disability or disease.

heterogeneous group – A varied group.

homogeneous group – A group sharing some similarity (such as age).

individualization and differentiation of educational goals – Modifying educational goals according to the abilities of individual children, setting various goals based on the potential of the children forming the class or group.

compulsive behavior – Performing an activity persistently and repetitively.

cooperation, cooperative learning – Learning based on a collaborative completion of tasks in a diverse group of children, where the success of the individual in achieving their goal is linked to the success of the other members of the group.

negative perfectionism – The pursuit of excellence motivated by fear of one’s own failure and disappointing others.

nonverbal communication – Different ways of communicating information without using words, something we consciously or unconsciously provide to other people.

perceptual key – Information influencing the way we perceive and evaluate other people.

physiological development – Natural development.

pictograms – Graphical representations of concepts or communication via pictures.

pro-social behavior – Behavior whose goal is to benefit other people.

psychogenic disorder – A disorder originating in a mental condition or state.

psychosomatic problems – Health issues caused by an adverse psychological condition of the child.

regression – A return to manifestations typical of an earlier developmental phase.

representative objects – Objects representing various activities the child carries out during their daily schedule, they are used to represent the regular day-plan or sequence of activities.

resonation cavities – The cavities of the throat, nose and mouth – which allow speech modulation.

self-image – One’s concept of the self – how an individual views themselves.

socially-dependent construct – Emerging from a process of social interaction and communication, as the opposite of talent as an innate phenomenon.

social interaction – The effect individuals or groups have on one another.

social learning – Ways to acquire patterns of behavior and appropriate conduct for a given social situation, learning social roles.

stagnation – Cessation of development, getting stuck at a certain developmental level.

stereotypical game or activity – A repetitive activity (such as rocking back and forth, rubbing hands together).

symptom – A manifestation (for instance of a disorder or disease).

tonus disorder – Muscle tension disorders.