6/18/2023 0 Comments Intermodal perception![]() ![]() Here we examine infants' ability to tell whether there are one or two auditory objects present on the basis of auditory harmonicity cues, by capitalizing on their abilities to understand small numbers and to match the number of auditory and visual objects in the stimulus. ![]() Infants must learn to encode and represent the relevant information from the sensory input in each modality in order to make sense of and interact with people and things in their environment. Most environments consist of complex multisensory scenes containing objects with both audible and visible properties. ![]() The young infant's ability to organize and process the sensory world is fundamental to virtually all aspects of development. We conclude that infants use harmonicity as a cue for source separation when integrating auditory and visual information in object perception. Four-month-old infants showed surprise at the incongruous pairings, looking longer at the display of two balls when paired with the in-tune complex and at the display of one ball when paired with the mistuned harmonic complex. We paired in-tune and mistuned complex tones with visual displays that contained either one or two bouncing balls. In the present study we use an audiovisual procedure to investigate whether infants perceive a complex tone with an 8% mistuned harmonic as emanating from two objects, rather than merely detecting the mistuned cue. They behaviourally discriminate a complex tone with a mistuned harmonic from the same complex with in-tune harmonics, and show an object-related event-related potential (ERP) electrophysiological (EEG) response to the stimulus with mistuned harmonics. Previous work by our group demonstrated that 4-month-old infants are also sensitive to this cue. Consequently, adults hear a mistuned harmonic in a complex sound as a distinct auditory object ( Alain et al., 2003). One important cue to this source separation is that complex tones with pitch typically contain a fundamental frequency and harmonics at integer multiples of the fundamental. Sounds emitted by different objects sum in the air and the auditory system must figure out which parts of the complex waveform belong to different sources (auditory objects). Here we use a behavioural method to examine infants' use of harmonicity cues to auditory object perception in a multisensory context. ![]() Are there any processes not associated with perception? Surely there are, but the pervasiveness of perception is truly impressive, and the phenomena of perception and its mechanisms are what this encyclopedia is about.Infants learn to use auditory and visual information to organize the sensory world into identifiable objects with particular locations. It presents two parallel and interacting approaches: the psychophysical, or determining the relationship between stimuli in the environment and perception, and the physiological, or locating the biological systems responsible for perception. The Encyclopedia of Perception presents a comprehensive overview of the field of perception through authoritative essays written by leading researchers and theoreticians in psychology, the cognitive sciences, neuroscience, and medical disciplines. Perceptual processes such as recognizing faces, seeing color, hearing music, and feeling pain represent the actions of complex mechanisms, yet we usually do them easily. The field of perception is devoted to explaining the operation of the senses and the experiences and behaviors resulting from stimulation of the senses. ![]()
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