Hipólito Marrero

Visual search of emotional faces: The role of affective content and featural distinctiveness

We investigated the source of the visual search advantage of some emotional facial expressions. An emotional face target (happy, surprised, disgusted, fearful, angry, or sad) was presented in an array of neutral faces. A faster detection was found for happy targets, with angry and, especially, sad targets being detected more poorly. Physical image properties (e.g., luminance) were ruled out as a potential source of these differences in visual search. In contrast, the search advantage is partly due to the facilitated processing of affective content, as shown by an emotion identification task. Happy expressions were identified faster than the other expressions and were less likely to be confounded with neutral faces, whereas misjudgements occurred more often for angry and sad expressions. Nevertheless, the distinctiveness of some local features (e.g., teeth) that are consistently associated with emotional expressions plays the strongest role in the search advantage pattern. When the contribution of these features to visual search was factored out statistically, the advantage disappeared.

When does the brain distinguish between genuine and ambiguous smiles? An ERP study.

Event-related brain potentials (ERPs) were recorded to assess the processing time course of ambiguous facial expressions with a smiling mouth but neutral, fearful, or angry eyes, in comparison with genuinely happy faces (a smile and happy eyes) and non-happy faces (neutral, fearful, or angry mouth and eyes). Participants judged whether the faces looked truly happy or not. Electroencephalographic recordings were made from 64 scalp electrodes to generate ERPs. The neural activation patterns showed early P200 sensitivity (differences between negative and positive or neutral expressions) and EPN sensitivity (differences between positive and neutral expressions) to emotional valence. In contrast, sensitivity to ambiguity (differences between genuine and ambiguous expressions) emerged only in later LPP components. Discrimination of emotional vs. neutral affect occurs between 180 and 430ms from stimulus onset, whereas the detection and resolution of ambiguity takes place between 470 and 720ms. In addition, while blended expressions involving a smile with angry eyes can be identified as not happy in the P200 (175-240ms) component, smiles with fearful or neutral eyes produce the same ERP pattern as genuinely happy faces, thus revealing poor discrimination.

Comprensión de las relaciones interpersonales en el contexto de narraciones de episodios de interacción

Resumen En este artículo proponemos que el proceso de comprensión de narraciones interpersonales recoge los cambios que se producen en las relaciones de los protagonistas como consecuencia de las interacciones habidas entre ellos. Para comprobar esta hipótesis medimos la accesibilidadde una frase que describía una relación (próxima o distante) entre los protagonistas de un episodio, en el que acontecía una interacción interpersonal (positiva o negativa). Los resultados del experimento realizado mostraron que el tiempo de lectura de la relación final de los protagonistas dependía de la congruencia con la relación previa y con la conducta. Estos resultados se presentan contrastando las diferentes perspectivas teóricas en la comprensión de narraciones y enfatizando la relevancia de la cognición social en la comprensión de textos interpersonales.

Content and Strategy in Syllogistic Reasoning

Syllogistic reasoning has been investigated as a general deductive process (Johnson-Laird & Byrne, 1991; Revlis, 1975; Rips, 1994). However, several studies have demonstrated the role of cognitive strategies in this type of reasoning. These strategies focus on the method used by the participants (Ford, 1995; Gilhooly, Logie, Wetherick, & Wynn, 1993) and strategies related to different interpretations of the quantified premises (Roberts, Newstead, & Griggs, 2001). In this paper, we propose that content (as well as individual cognitive differences) is an important factor in inducing a certain strategy or method for syllogistic resolution. Specifically, we suggest that syllogisms with a causal conditional premise that can be extended by an agency premise induce the use of a conditional method. To demonstrate this, we carried out two experiments. Experiment 1 provided evidence that this type of syllogism leads participants to draw the predicted conditional conclusions, in contrast with control content syllogisms. In Experiment 2, we demonstrated that the drawing of conditional conclusions is based on a causal conditional to an agent representation of the syllogism premises. These results support the role of content as inducing a particular strategy for syllogistic resolution. The implications of these results are discussed.

Phonological, lexical, and semantic errors produced by impairment at the output buffer in a Spanish aphasic patient

We present a single case of a right-handed female patient, RH, who was categorized as suffering from conduction aphasia. She presented no articulatory problems during spontaneous speech but made a significant number of phonological paraphasias in naming and repetition tasks. The number of errors increased for long words and pseudowords. This pattern of results points to damage in the “Phonological Output Buffer” (POB) as the basis of this disorder. However, this patient did not make mistakes when reading words and pseudowords aloud, even when we introduced a delay between the presentation of the word and its production to test the working memory resources of the phonological buffer. Furthermore, the patient’s ability to name objects, repeat words, and write to dictation improved with her degree of familiarity with the items. The damage could be situated at the point where phonemes are selected and ordered to produce words. We posit that the deficits observed in this patient, and the differences encountered between her performance and that of others described in the literature, in particular in reading tasks, can be explained by considering POB damage to be gradual in nature. According to this explanation, the performance of patients with damage to the POB will depend on the amount of information provided by the stimulus (word/nonword), the language particularities (regular/irregular), and the nature of the task demands (repetition, writing, naming, or reading).

Por sus actos los conoceréis : inferencia de la relación interpersonal en narraciones verbales y pictóricas

ResumenA lo largo de tres experimentos investigamos el proceso de comprension de episodios interpersonales narrados. Se puso a prueba la hipotesis de que las personas, a partir de la lectura u observacion de la conducta interpersonal, infieren la relacion entre los protagonistas de una narracion. En los experimentos 1 y 2 los sujetos leian una situacion que requeria que uno de los protagonistas se involucrase positivamente con el otro. En el experimento 1 comprobamos que los sujetos tardaban menos tiempo en leer la relacion interpersonal cuando aparecia despues de la conduta del protagonista comprometido que cuando aparecia antes. En el experimento 2 encontramos que cuando dicha conducta era positiva se facilitaba la lectura de una relacion proxima frente a una distante, lo que no ocurria cuando la conducta era negativa. En el experimento 3, donde se replico el experimento 2 pero presentando los episodios mediante vinetas de comics, se encontraron unos efectos similares a los del experimento 2.Los resulta...

Carefully Encoding Approach/Avoidance Body Locomotion With Interpersonal Conduct in Narrated Interactions

Approach and avoidance tendencies towards valenced others could be associated with our interpersonal conduct towards them: helping would be associated with approach tendency, and harming (or denying help) would be associated with avoidance. We propose that the encoding of this association enjoys attentional priority, as approach/avoidance representations of past interactions would regulate ones predisposition to either help or harm in subsequent interactions. Participants listened to interactions conveying positive/negative conduct between 2 characters. The conduct verb was then presented visually with a cue prompting participants to quickly step forward or backward. Subsequently, they performed a recognition task of noncentral story details. In matching conditions (positive conduct-step forward, negative conduct-step backward) the concurrent step should interfere with the encoding of motor representation of the conduct verb, and the verb encoding should divert attentional resources from the consolidation of memory traces of less relevant information. Results showed the predicted impairment in the recognition task in matching conditions, which supports an attentional bias towards encoding motor approach/avoidance representation of interpersonal conduct in the process of comprehending narrated interactions.

Understanding approach and avoidance in verbal descriptions of everyday actions: An ERP study

Understanding verbal descriptions of everyday actions could involve the neural representation of action direction (avoidance and approach) toward persons and things. We recorded the electrophysiological activity of participants while they were reading approach/avoidance action sentences that were directed toward a target: a thing/a person (i.e., “Petra accepted/rejected Ramón in her group”/ “Petra accepted/rejected the receipt of the bank”). We measured brain potentials time locked to the target word. In the case of things, we found a N400-like component with right frontal distribution modulated by approach/avoidance action. This component was more negative in avoidance than in approach sentences. In the case of persons, a later negative event-related potential (545–750 ms) with left frontal distribution was sensitive to verb direction, showing more negative amplitude for approach than avoidance actions. In addition, more negativity in approach-person sentences was associated with fear avoidance trait, whereas less negativity in avoidance-person sentences was associated with a greater approach trait. Our results support that verbal descriptions of approach/avoidance actions are encoded differently depending on whether the target is a thing or a person. Implications of these results for a social, emotional and motivational understanding of action language are discussed.