Person: Serrano Pedraza, Ignacio
Loading...
First Name
Ignacio
Last Name
Serrano Pedraza
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Psicología
Department
Psicología Experimental, Procesos Cognitivos y Logopedia
Area
Psicología Básica
Identifiers
3 results
Search Results
Now showing 1 - 3 of 3
Item A comparison of backward masking of faces in expression and gender identification(Psicológica, 2014) Aguado Aguilar, Luis; Serrano Pedraza, Ignacio; García Gutiérrez, Ana; PsicológicaThe effects of different masking conditions on identification of face gender and expression at different target durations (17-119 ms time range) were studied in two experiments. In Experiments 1a and 1b, the effects of face masks were compared against those of noise masks (scrambled face stimuli) and a control, no-mask condition. Significant masking by noise masks was only found at the shortest target duration (17 ms). Effective masking by face masks was observed over a slightly longer time window in the gender than in the expression task (17-85 and 17-51 ms respectively). Moreover, clearly differentiated effects of face and noise masks were observed only in the expression task. In Experiments 2a and 2b, faces quantized with different sampling sizes were used as masks. A graded effect of sampling size was observed in the expression task, with those masks that preserved more facial information exerting stronger masking. However, all masks were equally effective in the gender task. These results demonstrate an interaction between masking and task demands, suggesting that different processing mechanisms may underlie identification of different properties of faces. An interpretation is offered in terms of the relative role of configural and feature processing in expression and gender identification.Item Effects of spatial frequency content on classification of face gender and expression.(The Spanish journal of psychology, 2010) Aguado Aguilar, Luis; Serrano Pedraza, Ignacio; Rodríguez, Sonia; Román, Francisco JThe role of different spatial frequency bands on face gender and expression categorization was studied in three experiments. Accuracy and reaction time were measured for unfiltered, low-pass (cut-off frequency of 1 cycle/deg) and high-pass (cutoff frequency of 3 cycles/deg) filtered faces. Filtered and unfiltered faces were equated in root-mean-squared contrast. For low-pass filtered faces reaction times were higher than unfiltered and high-pass filtered faces in both categorization tasks. In the expression task, these results were obtained with expressive faces presented in isolation (Experiment 1) and also with neutral-expressive dynamic sequences where each expressive face was preceded by a briefly presented neutral version of the same face (Experiment 2). For high-pass filtered faces different effects were observed on gender and expression categorization. While both speed and accuracy of gender categorization were reduced comparing to unfiltered faces, the efficiency of expression classification remained similar. Finally, we found no differences between expressive and non expressive faces in the effects of spatial frequency filtering on gender categorization (Experiment 3). These results show a common role of information from the high spatial frequency band in the categorization of face gender and expression.Item Symmetrical interaction of sex and expression in face classification tasks(Attention, Perception, and Psychophysics, 2009) Aguado Aguilar, Luis; García Gutiérrez, Ana; Serrano Pedraza, IgnacioClassification of faces as to their sex or their expression—with sex and expression varying orthogonally—was studied in three experiments. In Experiment 1, expression classification was influenced by sex, with angry male faces being classified faster than angry female faces. Complementarily, sex classification was faster for happy than for angry female faces. In Experiment 2, mutual interaction of sex and expression was also found when the participants were asked to classify top and bottom face segments. In Experiment 3, a face inversion effect was found for both sex and expression classification of whole faces. However, a symmetrical interaction between sex and expression was again found. The results are discussed in terms of configural versus feature processing in the perception of face sex and expression and of their relevance to face perception models that postulate independent processing of different facial features.