A Comparison of Primate Prefrontal and Inferior Temporal Cortices during Visual Categorization

  title={A Comparison of Primate Prefrontal and Inferior Temporal Cortices during Visual Categorization},
  author={David J. Freedman and Maximilian Riesenhuber and Tomaso A. Poggio and Earl K. Miller},
  journal={The Journal of Neuroscience},
  pages={5235 - 5246}
Previous studies have suggested that both the prefrontal cortex (PFC) and inferior temporal cortex (ITC) are involved in high-level visual processing and categorization, but their respective roles are not known. To address this, we trained monkeys to categorize a continuous set of visual stimuli into two categories, “cats” and “dogs.” The stimuli were parametrically generated using a computer graphics morphing system (Sheltonelton, 2000) that allowed precise control over stimulus shape. After… 

Task Dependence of Visual and Category Representations in Prefrontal and Inferior Temporal Cortices

The impact of task relevance on categorization-related activity in PFC and ITC is examined by recording from both areas as monkeys alternated between a shape categorization and passive viewing tasks, suggesting the ITC and PFC show differing degrees of task-dependent flexibility and are preferentially involved in the perceptual and cognitive aspects of the categorization process, respectively.

Visual and Category Representations Shaped by the Interaction Between Inferior Temporal and Prefrontal Cortices

A network model of visual system, which performs a delayed match-to-category task, and shows that top-down signal from PFC to IT improves the ability of PFC neurons to categorize the mixed images that are closer to a category boundary, may provide a clue for understanding the neural mechanism underlying categorization task.

Comparison of Primate Prefrontal and Premotor Cortex Neuronal Activity during Visual Categorization

PFC neurons represented all variables required to solve the cognitive problem, whereas PMC neurons represented only the final decision variable that drove the appropriate motor action required to obtain a reward, which fits well with PFC's hypothesized role in learning arbitrary information and directing behavior as well as the PMC's role in motor planning.

Comparison of Primate Prefrontal and Premotor Cortex Neuronal Activity Visual Categorization

PFC neurons represented all variables required to solve the cognitive problem, whereas PMC neurons instead represented only the final decision variable that drove the appropriate motor action required to obtain a reward.

Preferential Encoding of Visual Categories in Parietal Cortex Compared to Prefrontal Cortex

These findings suggest that LIP is strongly involved in visual categorization and argue against the idea that parietal category signals arise as a result of feedback from PFC during this task.

Representation of Multiple, Independent Categories in the Primate Prefrontal Cortex

A Comparison of Abstract Rules in the Prefrontal Cortex, Premotor Cortex, Inferior Temporal Cortex, and Striatum

Investigations to two areas directly connected with the PFC and the PMC, the inferior temporal cortex (ITC) and the dorsal striatum (STR) show that abstract rules or principles are encoded in these areas, but perceptual information was encoded more strongly and earlier in the ITC, followed by the P FC; they had weak, if any, effects on neural activity in thePMC and STR.

A parieto-frontal network for visual numerical information in the monkey.

  • A. NiederE. Miller
  • Biology, Psychology
    Proceedings of the National Academy of Sciences of the United States of America
  • 2004
Activity in the PPC and the anterior inferior temporal cortex was surveyed while monkeys performed a visual numerosity judgment task and neurons in the fundus of the intraparietal sulcus responded and conveyed numerosity earlier than PFC neurons, suggesting that numerosity information flows from the PFC to the lateral PFC.

Experience-dependent sharpening of visual shape selectivity in inferior temporal cortex.

It is found that ITC stimulus selectivity was sharper for familiar than novel stimuli, suggesting that enhanced shape tuning in ITC can arise for both passively experienced and explicitly trained stimuli.

Visual categorization and the parietal cortex

It is found that a subdivision of parietal cortex, LIP, reflects learned categories for multiple types of visual stimuli, arguing that, in trained animals, parietal abstract association or category signals are unlikely to arise via feedback from prefrontal cortex (PFC).



Neural Mechanisms of Visual Working Memory in Prefrontal Cortex of the Macaque

It is suggested that PF cortex plays a primary role in working memory tasks and may be a source of feedback inputs to IT cortex, biasing activity in favor of behaviorally relevant stimuli.

Categorization in IT and PFC: Model and Experiments

It is found that view-tuned model IT units that were trained without any explicit category information can show categoryrelated tuning as observed in the experiment, which suggests that the tuning properties of experimental IT neurons might primarily be shaped by bottom-up stimulus-space statistics, with little influence of topdown task-specific information.

Shape representation in the inferior temporal cortex of monkeys

Neuronal correlates of parametric working memory in the prefrontal cortex

It is predicted that other behavioural tasks that require ordinal comparisons between scalar analogue stimuli would give rise to monotonic responses similar to those reported here.

Visual categorization shapes feature selectivity in the primate temporal cortex

This work shows that feature selectivity in the macaque inferior temporal cortex is shaped by categorization of objects on the basis of their visual features, and finds enhanced neuronal representation of the diagnostic features relative to the non-diagnostic ones.

Neural correlates of a decision in the dorsolateral prefrontal cortex of the macaque

A combination of sensory integration and motor planning could reflect the conversion of visual motion information into a categorical decision about direction and thus give insight into the neural computations behind a simple cognitive act.

Activity of neurons in anterior inferior temporal cortex during a short- term memory task

  • EK MillerL. LiR. Desimone
  • Psychology, Biology
    The Journal of neuroscience : the official journal of the Society for Neuroscience
  • 1993
Inferior temporal (IT) cortex of primates is recorded from IT neurons while monkeys performed a delayed matching-to-sample task, with multiple intervening items between the sample and matching test stimulus, and an active reset mechanism appears to restrict the memory comparison to just the stimuli presented within a trial.

Categorization of complex visual images by rhesus monkeys. Part 1: behavioural study

  • R. Vogels
  • Psychology, Biology
    The European journal of neuroscience
  • 1999
The results indicate that rhesus monkeys can learn to categorize socially neutral, complex, natural visual images and suggest that this categorization is based on a combination of low‐level features.

Task-specific neural activity in the primate prefrontal cortex.

It is found that in monkeys trained to alternate between three tasks, the activity of many neurons in the prefrontal cortex was task dependent, which supports the hypothesis that a major prefrontal function is the acquisition and implementation of task context and the "rules" used to guide behavior.

View-invariant representations of familiar objects by neurons in the inferior temporal visual cortex.

A population of single neurons in the temporal visual cortex that have view-invariant representations of familiar objects are described, and the coding scheme was shown to be sparse distributed, with relatively independent information being provided by the different neurons.