The human ear can detect sound - measured in hertz (Hz), which is a unit of frequency that determines vibrations per second - as low as 20 Hz and as high as 20000 Hz, and it can hear the tick of a clock about 20 feet (6.1 m) away in a quiet room. The human eye can detect the equivalent of a single candle flame burning 30 miles (48.3 km) away and can distinguish among more than 300,000 different colours. In many ways, our senses are quite remarkable. The human perceptual system is wired for accuracy, and people are exceedingly good at making use of the wide variety of information available to them (Stoffregen & Bardy, 2001). Our tongues react to the molecules of the foods we eat, and our noses detect scents in the air. Our skin senses touch, pressure, hot, and cold. Our eyes detect light energy, and our ears pick up sound waves. Humans possess powerful sensory capacities that allow us to sense the kaleidoscope of sights, sounds, smells, and tastes that surround us. Sensory thresholds: What can we experience? Explain selective attention and sensory adaptation.Explain the difference between sensation and perception, and describe how psychologists measure sensory and difference thresholds.
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