Michael C. Mangini

Learn More
When we look at a face, we readily perceive that person’s gender, expression, identity, age, and attractiveness. Perceivers as well as scientists have hitherto had little success in articulating just what information we are employing to achieve these subjectively immediate and effortless classifications. We describe here a method that estimates that(More)
Faces reversed in contrast cannot be readily recognized, an effect absent in object recognition. Why? Four factors: expertise, reflectance (pigmentation), high similarity, and the need to discriminate metrically varying smooth surfaces have been offered as explanations. Observers achieved expertise on discriminating smoothly shaped, pigmented, non-face(More)
Nonverbal visual cues accompany speech to supplement the meaning of spoken words, signify emotional state, indicate position in discourse, and provide back-channel feedback. This visual information includes head movements, facial expressions and body gestures. In this article we describe techniques for manipulating both verbal and nonverbal facial gestures(More)
Following Albert Hofmann's discovery of LSD's psychoactive properties in 1943, and previous to their scheduling as controlled substances, the psychedelic drugs were widely studied--six international conferences and hundreds of papers discussed their potential therapeutic usefulness. The observation that the frightening experience of delirium tremens(More)
During conversation, women tend to nod their heads more frequently and more vigorously than men. An individual speaking with a woman tends to nod his or her head more than when speaking with a man. Is this due to social expectation or due to coupled motion dynamics between the speakers? We present a novel methodology that allows us to randomly assign(More)
Shape representation is accomplished by a series of cortical stages in which cells in the first stage (V1) have local receptive fields tuned to contrast at a particular scale and orientation, each well modeled as a Gabor filter. In succeeding stages, the representation becomes largely invariant to Gabor coding (Kobatake & Tanaka, 1994). Because of the(More)
What information is used for sorting pictures of complex stimuli into categories? We applied a reverse correlation method to reveal the visual features mediating categorization in humans and baboons. Two baboons and 6 humans were trained to sort, by species, pictures of human and baboon faces on which random visual noise was superimposed. On ambiguous probe(More)
People reveal considerable expertise in the classification of a face in terms of gender, expression, and identity, yet the representation mediating such performance is often not available to conscious, explicit description. To specify these representations, observers classified faces appearing in sinusoidal noise as male/female, happy/unhappy, or Tom(More)
Face recognition is markedly impaired when the stimuli differ in contrast polarity (negation) and upside-down orientation (inversion). However, these costs are not found for matching objects in the same subordinate class, such as chairs, even when the mismatching faces and objects are equivalently dissimilar, as assessed by a Gabor jet similarity metric(More)