scholarly journals Linking predictive coding in visual cortex to object representations in the medial temporal lobe

2014 ◽  
Vol 14 (10) ◽  
pp. 954-954
Author(s):  
N. C. Hindy ◽  
F. Y. Ng ◽  
N. B. Turk-Browne
Keyword(s):  
Visual Cortex ◽  
Temporal Lobe ◽  
Medial Temporal Lobe ◽  
Predictive Coding ◽  
Object Representations

scholarly journals Functions of ventral visual cortex after bilateral medial temporal lobe damage

2020 ◽  
Vol 191 ◽  
pp. 101819 ◽  
Author(s):  
Jiye G. Kim ◽  
Emma Gregory ◽  
Barbara Landau ◽  
Michael McCloskey ◽  
Nicholas B. Turk-Browne ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Temporal Lobe ◽  
Medial Temporal Lobe

scholarly journals Complex object representations in the medial temporal lobe: Feature conjunctions and view invariance

2013 ◽  
Vol 13 (9) ◽  
pp. 783-783
Author(s):  
J. Erez ◽  
R. Cusack ◽  
W. Kendall ◽  
M. Barense
Keyword(s):  
Temporal Lobe ◽  
Medial Temporal Lobe ◽  
Complex Object ◽  
Object Representations ◽  
View Invariance

scholarly journals Shaping of Object Representations in the Human Medial Temporal Lobe Based on Temporal Regularities

2012 ◽  
Vol 22 (17) ◽  
pp. 1622-1627 ◽  
Author(s):  
Anna C. Schapiro ◽  
Lauren V. Kustner ◽  
Nicholas B. Turk-Browne
Keyword(s):  
Temporal Lobe ◽  
Medial Temporal Lobe ◽  
Object Representations

scholarly journals Feature-based encoding of face identity by single neurons in the human medial temporal lobe

2020 ◽  
Author(s):  
Runnan Cao ◽  
Jinge Wang ◽  
Chujun Lin ◽  
Ueli Rutishauser ◽  
Alexander Todorov ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Temporal Lobe ◽  
Visual Information ◽  
Medial Temporal Lobe ◽  
Declarative Memory ◽  
Semantic Representation ◽  
Feature Space ◽  
Face Identity ◽  
Feature Based ◽  
Face Stimuli

AbstractNeurons in the human medial temporal lobe (MTL) that are selective for the identity of specific people are classically thought to encode identity invariant to visual features. However, it remains largely unknown how visual information from higher visual cortex is translated into a semantic representation of an individual person. Here, we show that some MTL neurons are selective to multiple different face identities on the basis of shared features that form clusters in the representation of a deep neural network trained to recognize faces. Contrary to prevailing views, we find that these neurons represent an individual’s face with feature-based encoding, rather than through association with concepts. The response of feature neurons did not depend on face identity nor face familiarity, and the region of feature space to which they are tuned predicted their response to new face stimuli. Our results provide critical evidence bridging the perception-driven representation of facial features in the higher visual cortex and the memory-driven representation of semantics in the MTL, which may form the basis for declarative memory.

scholarly journals Functions of ventral visual cortex after bilateral hippocampal loss

2019 ◽  
Author(s):  
Jiye G. Kim ◽  
Emma Gregory ◽  
Barbara Landau ◽  
Michael McCloskey ◽  
Nicholas B. Turk-Browne ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Visual System ◽  
Temporal Lobe ◽  
Medial Temporal Lobe ◽  
Adaptation Effect ◽  
Amnesic Patient ◽  
Time Lags ◽  
Rapid Learning ◽  
Visual Areas ◽  
Adaptation Phenomenon

AbstractRepeated stimuli elicit attenuated responses in visual cortex relative to novel stimuli. This adaptation phenomenon can be considered a form of rapid learning and a signature of perceptual memory. Adaptation occurs not only when a stimulus is repeated immediately, but also when there is a lag in terms of time and other intervening stimuli before the repetition. But how does the visual system keep track of which stimuli are repeated, especially after long delays and many intervening stimuli? We hypothesized that the hippocampus supports long-lag adaptation, given that it learns from single experiences, maintains information over delays, and sends feedback to visual cortex. We tested this hypothesis with fMRI in an amnesic patient, LSJ, who has encephalitic damage to the medial temporal lobe resulting in complete bilateral hippocampal loss. We measured adaptation at varying time lags between repetitions in functionally localized visual areas that were intact in LSJ. We observed that these areas track information over a few minutes even when the hippocampus is unavailable. Indeed, LSJ and controls were identical when attention was directed away from the repeating stimuli: adaptation occurred for lags up to three minutes, but not six minutes. However, when attention was directed toward stimuli, controls now showed an adaptation effect at six minutes but LSJ did not. These findings suggest that visual cortex can support one-shot perceptual memories lasting for several minutes but that the hippocampus is necessary for adaptation in visual cortex after longer delays when stimuli are task-relevant.

Children show adult-like hippocampal pattern separation for familiar but not novel events

2020 ◽  
Author(s):  
Susan L. Benear ◽  
Elizabeth A. Horwath ◽  
Emily Cowan ◽  
M. Catalina Camacho ◽  
Chi Ngo ◽  
...  
Keyword(s):  
Episodic Memory ◽  
Temporal Lobe ◽  
Medial Temporal Lobe ◽  
Developmental Change ◽  
Pattern Separation ◽  
Developmental Changes ◽  
Similarity Analysis ◽  
Separation Processes ◽  
Parahippocampal Cortex ◽  
Pattern Similarity

The medial temporal lobe (MTL) undergoes critical developmental change throughout childhood, which aligns with developmental changes in episodic memory. We used representational similarity analysis to compare neural pattern similarity for children and adults in hippocampus and parahippocampal cortex during naturalistic viewing of clips from the same movie or different movies. Some movies were more familiar to participants than others. Neural pattern similarity was generally lower for clips from the same movie, indicating that related content taxes pattern separation-like processes. However, children showed this effect only for movies with which they were familiar, whereas adults showed the effect consistently. These data suggest that children need more exposures to stimuli in order to show mature pattern separation processes.

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