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| The experience resulting from the stimulation of a sense organ. |
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| The interpretation of sensory stimulation based on experience |
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| The selection of particular sensory input for perceptual and cognitive processing and the exclusion of competing input. |
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| The perceptual experience that results from active exploration of objects by touch. |
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| The perceptual experience that results from motion of the body and the pull of gravity. |
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| A research method for the study of visual ability in infancy. Two visual stimuli are presented simultaneously, and the amount of time the infant looks at each is measured. |
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| The clarity with which visual images can be perceived. |
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| The experience that the physical size of an object remains the same even though the size of its projected image on the eye varies. |
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| The experience that the physical shape of an object remains the same, even though the shape of its projected image on the eye varies. |
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| The experience that the brightness of an object remains the same, even though the amount of light it reflects back to the eye changes (because of shadows or changes in the illuminating light). |
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| The experience that the colour of an object remains the same, even thought the wavelengths it reflects back to the eye change (because of changes in the colour of the illuminating light). |
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| A research method for the study of depth perception in infancy. The infant is placed on a glass-covered table near an apparent drop-off, and perception of depth is inferred if the infant avoids the drop. |
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| Visual cues that indicate the relative distances of objects through static, picturelike information—for example, interposition of one object in front of another. |
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| Visual cues that indicate the relative distances of objects through movements of the objects or of the observer. |
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| An observer’s experience that a closer object moves across the field of view faster than a more distant object when both objects are moving at the same speed or when the objects are stationary and the observer moves. |
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| A natural reaction to novel stimuli that enhances stimulus processing and includes orientation of the eyes and ears to optimize stimulus reception, inhibition of ongoing activity, and a variety of physiological changes. |
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| A natural reaction to novel stimuli that tends to protect the organism from further stimulation, and that may include orientation of the stimulus receptors away from the stimulus source and a variety of physiological changes. |
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| Concentration on a stimulus or event with attendant disregard for other stimuli or events. |
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