Recognition memory

Recognition memory, a subcategory of declarative memory, is the ability to recognize previously encountered events, objects, or people. When the previously experienced event is reexperienced, this environmental content is matched to stored memory representations, eliciting matching signals. As first established by psychology experiments in the 1970s, recognition memory for pictures is quite remarkable: humans can remember thousands of images at high accuracy after seeing each only once and only for a few seconds. Recognition memory can be subdivided into two component processes: recollection and familiarity, sometimes referred to as "remembering" and "knowing", respectively. Recollection is the retrieval of details associated with the previously experienced event. In contrast, familiarity is the feeling that the event was previously experienced, without recollection. Thus, the fundamental distinction between the two processes is that recollection is

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Hypothalamic pregnenolone mediates recognition memory in the context of metabolic disorders

Sara Ramirez Flores, Maria del Carmen Sandi Perez, Ioannis Zalachoras

Obesity and type 2 diabetes are associated with cognitive dysfunction. Because the hypothalamus is implicated in energy balance control and memory disorders, we hypothesized that specific neurons in this brain region are at the interface of metabolism and cognition. Acute obesogenic diet administration in mice impaired recognition memory due to defective production of the neurosteroid precursor pregnenolone in the hypothalamus. Genetic interference with pregnenolone synthesis by Star deletion in hypothalamic POMC, but not AgRP neurons, deteriorated recognition memory independently of metabolic disturbances. Our data suggest that pregnenolone’s effects on cognitive function were mediated via an autocrine mechanism on POMC neurons, influencing hippocampal long-term potentiation. The relevance of central pregnenolone on cognition was also confirmed in metabolically unhealthy patients with obesity. Our data reveal an unsuspected role for POMC neuron-derived neurosteroids in cognition. These results provide the basis for a framework to investigate new facets of POMC neuron biology with implications for cognitive disorders.

Elsevier2022

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On the Recognition Performance of BioHashing on state-of-the-art Face Recognition models

Sébastien Marcel, Hatef Otroshi Shahreza

Face recognition has become a popular authentication tool in recent years. Modern state-of-the-art (SOTA) face recognition methods rely on deep neural networks, which extract discriminative features from face images. Although these methods have high recognition performance, the extracted features contain privacy-sensitive information. Hence, the users' privacy would be jeopardized if the features stored in the face recognition system were compromised. Accordingly, protecting the extracted face features (templates) is an essential task in face recognition systems. In this paper, we use BioHashing for face template protection and aim to establish the minimum BioHash length that would be required in order to maintain the recognition accuracy achieved by the corresponding unprotected system. We consider two hypotheses and experimentally show that the performance depends on the value of the BioHash length (as opposed to the ratio of the BioHash length to the dimension of the original features). To eliminate bias in our experiments, we use several SOTA face recognition models with different network structures, loss functions, and training datasets, and we evaluate these models on two different datasets (LFW and MOBIO). We provide an open-source implementation of all the experiments presented in this paper so that other researchers can verify our findings and build upon our work.

IEEE2021

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Adult Face Recognition in Score-Age-Quality Classification Space

Andrzej Drygajlo, Weifeng Li, Hui Qiu

Face verification in the simultaneous presence of age progression and changing face-image quality is an important problem that has not been widely addressed. In this paper, we study the problem by designing and evaluating a generalized Q-stack model, which combines the age and class-independent quality measures together with the scores from a baseline classifier using local ternary patterns, in order to obtain better recognition performance. This allows for improved long-term elms separation by introducing a multi-dimensional parameterized decision boundary in the score-age-quality classification space using a short-term enrolment model. This generalized method, based on the concept of classifier stacking with age- and quality (head pose and expression) aware decision boundary compares favorably with the conventional face verification approach, which uses decision threshold calculated only in the score space at the time of enrolment. The proposed approach is evaluated on the MORPH database.

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa2011

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Perception

La perception est l'activité par laquelle un sujet fait l'expérience d'objets ou de propriétés présents dans son environnement. Cette activité repose habituellement sur des informations fournies par

Explicit memory

Explicit memory (or declarative memory) is one of the two main types of long-term human memory, the other of which is implicit memory. Explicit memory is the conscious, intentional recollection of fac

Souvenir (mémoire)

Un souvenir est quelque chose dont on se remémore, un élément de la mémoire. Paul Valéry Pour René Descartes, la description des mécanismes psychologiques permet de définir certaines de nos facul

BIOENG-456: Controlling behavior in animals and robots

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BIO-447: Stem cells and organoids

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