The theories initially spawned by this. debate were propositional theory, imagery theory, and dual-coding theory. Related research further suggests that. knowledge encoding processes such as landmark-based and path-based learning may also affect these. representations. Such theories form a basis from which cartographers can begin to explore the mental. representations of spatial knowledge. The purpose of this study was to assess the mental organization of spatial. information and to examine the effect of varying the encoding process.
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Also known as: Perchloroethylene, Perc, PCE, PerSec, Tetranec. Chemical reference number (CAS): 127-18- 4. Tetrachloroethylene (PCE) is a nonflammable, liquid solvent widely used in dry cleaning, wood processing, fabric manufacturing, and metal degreasing.In homes, it may be found in suede protectors, paint removers, furniture stripper, water repellents, silicone lubricants, spot removers, glues, and wood cleaners.nformation. People are most often exposed to PCE when they use it in their work, when cleaning or doing hobbies. Breathing: PCE evaporates into the air. People are commonly exposed to PCE by breathing air containing its vapors. PCE can contaminate home air when people use cleaning solvents or other products.