taxi-, tax-, taxo-, taxio-, -taxia, -taxis, -taxy, tact-, -tactic, -tactical, -tactics

(Greek: arrangement, order, put in order, orientation; the movements or directed responses of motile organisms to stimuli, as indicated by the combining roots)

Positive galvanotaxis.
Positive osmotaxis.
Positive phototaxis.
Ataxia which involves the movements of the proximal (nearest) parts of a limb or limbs.
1. Disordered power of concentration.
2. Mental confusion; the inability to fix one's attention on anything or to make any sustained mental effort.
1. The dissociation between affect (reaction to a stimulus) and intellect; the separating of the emotions from other mental phenomena. It is considered characteristic of schizophrenia; also intrapsychic ataxia.
2. The separatiion of ideas and affect (external stimulus) as seen in schizophrenic disorders; the inappropriateness of affect (reactions to stimuli, including feelings, emotions, and moods).
rheotaxis, rheotactic
The orientation of an organism in a stream of liquid or air current, with its long axis parallel with the direction of fluid flow.

Negative rheotaxis refers to the movement of the organism in the same direction as that of the liquid (current); positive rheotaxis refers to the movement of the organism in the opposite direction to that of the liquid or current.

The arrangement of roots.
schizotaxia, schizotaxic
A subtle syndrome of brain dysfunction expressed, in part, as negative symptoms and neuropsychological deficits, but not as psychosis.

This syndrome is qualitatively similar, yet less severe, than that observed in schizophrenia patients.

All individuals with schizotaxia develop a personality structure, called the schizotype. Schizotype is characterized by four traits: cognitive slippage (mild thought disorder), social aversiveness, anhedonia, and ambivalence. It is thought that only a minority of schizotypal individuals decompensate into clinical schizophrenia.

The treatment of schizotaxia may benefit from methods effective in the psychotherapy of other neurodevelopmental conditions (Adult ADHD) which share some clinical features with schizotaxia.

No longer is schizotaxia considered as a theoretical construct describing the unknown neural substrate of schizophrenia, but the accumulation of research has revealed schizotaxia to be a clinically consequential condition.

Looking forward, formulating a diagnostic criteria for schizotaxia, devising diagnostic methods like genetic testing, and implementing environmental and pharmacological interventions are expected to help in the primary prevention of schizophrenia in the future.

—Excerpts from an article originally published in Indian Journal of Social Psychiatry; Ameen, S., Praharaj, S. & Sinha, V.K. (2004) "Schizotaxia: a review"; 20 (1-4), 27-34. Accessed from on June 28, 2006.
scototaxis, skototaxis
Movement of a motile organism to a dark area, as distinct from negative phototaxis.
seismotactic, seismotaxis
A directed response of a motile organism to mechanical vibration or a shock stimuli.
Arrangement of semaphylls (petals, sepals, tepals); primarily, pollinator attracting in function.
Skin edema induced by contact with a strong cutaneous irritant.
The movement of a cell or organism in response to a food stiulus, whether toward the food (positive sitotaxis) or away from the food (negative sitotaxis).
A directed response of a motile organism in continuous contact with a solid surface.