How do amplitude spectra influence rapid animal detection?
Amplitude spectra might provide information for natural scene classification. Amplitude does play a role in animal detection because accuracy suffers when amplitude is normalized. However, this effect could be due to an interaction between phase and amplitude, rather than to a loss of amplitude-only information. We used an amplitude-swapping paradigm to establish that animal detection is partly based on an interaction between phase and amplitude. A difference in false alarms for two subsets of our distractor stimuli suggests that the classification of scene environment (man-made versus natural) may also be based on an interaction between phase and amplitude. Examples of interaction between amplitude and phase are discussed.
Gaspar
Carl M
CM
Centre for Cognitive Neuroimaging (CCNi), Department of Psychology, University of Glasgow, G12 8QB Glasgow, UK.
Rousselet
Guillaume A
GA
D000328:Adult; D000818:Animals; D003463:Cues; D005260:Female; D005364:Field Dependence-Independence; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics; D055815:Young Adult