Gross disintegration of acts involving objects. No distress or attempts at correction. Frontal apraxia - disturbance of preliminary synthesis. Perseveration Serial tasks more likely disturbed. Cannot reproduce drawings from memory.
Problem is with plans rather than movements.
Patient's behavior can be controlled by irrelevant stimuli. B. Less Extensive Lesions Carry out simple single acts after visual or auditory instructions. Can't shift set if instructions are varied. Frontal - only lesion which disrupts ANS components of the orienting R. Stimulus looses signal status. Disturbance of active scanning.