C. Saavedra

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— A 300-800MHz CMOS radio receiver aiming at software-defined radio is proposed. It exploits an LNA preceded by a tunable LC filter with one external coil to achieve voltage amplification for low NF and low-pass filtering to improve the 3 rd and 5 th harmonic rejection of an RF-sampling receiver to >60dB. The balun-LNA provides partial IM3 compensation, to(More)
In face processing tasks, prior presentation of internal facial features, when compared with external ones, facilitates the recognition of subsequently displayed familiar faces. In a previous ERP study (Olivares & Iglesias, 2010) we found a visibly larger N400-like effect when identity mismatch familiar faces were preceded by internal features, as compared(More)
Brain activity underlying explicit and implicit processing of face familiarity was assessed by Event-Related Potentials (ERPs) elicited by famous and unknown faces with happy or neutral expressions. A set of faces was presented in a familiarity judgment (explicit) task and another in an expression judgment (implicit familiarity) task. After recording, these(More)
The perceptual processing of faces was studied using event-related potentials (ERPs) in 12 elderly patients with cognitive impairment, 15 elderly adults and 16 young adults in order to explore the sensitivity of N170/VPP to the cognitive decline associated to Alzheimer's disease. Famous and unknown faces were presented in a familiarity categorization task.(More)
We analyze the functional significance of different event-related potentials (ERPs) as electrophysiological indices of face perception and face recognition, according to cognitive and neurofunctional models of face processing. Initially, the processing of faces seems to be supported by early extrastriate occipital cortices and revealed by modulations of the(More)
Event-related potentials analysed in consecutive studies led us to the following findings: a) the perception of fear from faces is gated by selective attention at early latencies, whereas only after 480 ms was the perception of disgust modulated by attention allocation; b) the order of presentation of external and internal facial features influence the(More)
UNLABELLED BackGROUND/STUDY CONTEXT: Patients with mild Alzheimer's disease and mild cognitive impairment show selective loss of knowledge regarding facial identification. METHODS The authors focus on decline effects on event-related potentials (ERPs) P100, N170, N250, and N400, associated with the processing of facial identity. Different famous and(More)
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