Picture-object recognition in pigeons: Evidence of representational insight in a visual categorization task using a complementary information procedure.

2006 ◽  
Vol 32 (2) ◽  
pp. 190-195 ◽  
Author(s):  
Ulrike Aust ◽  
Ludwig Huber
Keyword(s):  
Object Recognition ◽  
Complementary Information ◽  
Categorization Task ◽  
Visual Categorization

Visual Categorization and Object Representation in Monkeys and Humans

2002 ◽  
Vol 14 (2) ◽  
pp. 187-198 ◽  
Author(s):  
N. Sigala ◽  
F. Gabbiani ◽  
N. K. Logothetis
Keyword(s):  
Object Representation ◽  
Rating Task ◽  
Linear Boundary ◽  
Conditional Probabilities ◽  
Diagnostic Features ◽  
Categorization Task ◽  
Visual Categorization ◽  
Perceptual Features ◽  
Subordinate Categorization

We investigated the influence of a categorization task on the extraction and representation of perceptual features in humans and monkeys. The use of parameterized stimuli (schematic faces and fish) with fixed diagnostic features in combination with a similarity-rating task allowed us to demonstrate perceptual sensitization to the diagnostic dimensions of the categorization task for the monkeys. Moreover, our results reveal important similarities between human and monkey visual subordinate categorization strategies. Neither the humans nor the monkeys compared the new stimuli to class prototypes or based their decisions on conditional probabilities along stimulus dimensions. Instead, they classified each object according to its similarity to familiar members of the alternative categories, or with respect to its position to a linear boundary between the learned categories.

scholarly journals A Comparison of Lateral and Medial Intraparietal Areas during a Visual Categorization Task

2013 ◽  
Vol 33 (32) ◽  
pp. 13157-13170 ◽  
Author(s):  
S. K. Swaminathan ◽  
N. Y. Masse ◽  
D. J. Freedman
Keyword(s):  
Categorization Task ◽  
Visual Categorization

Two Categorical Stages of Object Recognition

Perception ◽  
1978 ◽  
Vol 7 (6) ◽  
pp. 695-705 ◽  
Author(s):  
Elizabeth K Warrington ◽  
Angela M Taylor
Keyword(s):  
Object Recognition ◽  
Left Hemisphere ◽  
Right Hemisphere ◽  
Visual Object ◽  
Visual Object Recognition ◽  
Perceptual Categorization ◽  
Categorization Task ◽  
Semantic Categorization ◽  
Tentative Model ◽  
The Right

Visual object recognition was investigated in a group of eighty-one patients with right- or left-hemisphere lesions. Two tasks were used, one maximizing perceptual categorization by physical identity, the other maximizing semantic categorization by functional identity. The right-hemisphere group showed impairment on the perceptual categorization task and the left-hemisphere group were impaired on the semantic categorization task. The findings are discussed in terms of categorical stages of object recognition. A tentative model of their cerebral organization is suggested.

Visual Recognition

2005 ◽  
Vol 16 (2) ◽  
pp. 152-160 ◽  
Author(s):  
Kalanit Grill-Spector ◽  
Nancy Kanwisher
Keyword(s):  
Object Recognition ◽  
Exposure Duration ◽  
Visual Recognition ◽  
Natural Images ◽  
Visual Object ◽  
Visual Object Recognition ◽  
Perceptual Categorization ◽  
Identification Task ◽  
Categorization Task ◽  
Processing Steps

What is the sequence of processing steps involved in visual object recognition? We varied the exposure duration of natural images and measured subjects' performance on three different tasks, each designed to tap a different candidate component process of object recognition. For each exposure duration, accuracy was lower and reaction time longer on a within-category identification task (e.g., distinguishing pigeons from other birds) than on a perceptual categorization task (e.g., birds vs. cars). However, strikingly, at each exposure duration, subjects performed just as quickly and accurately on the categorization task as they did on a task requiring only object detection: By the time subjects knew an image contained an object at all, they already knew its category. These findings place powerful constraints on theories of object recognition.

scholarly journals Task- and Time-Dependent Memory Enhancement by Dehydroepiandosterone in Day-Old Chicks

2001 ◽  
Vol 8 (4) ◽  
pp. 255-270 ◽  
Author(s):  
A. N. B. Johnston ◽  
P. V. Migues
Keyword(s):  
Open Field Test ◽  
Time Dependent ◽  
Avoidance Task ◽  
Intracerebral Injection ◽  
Chick Brain ◽  
Memory Enhancement ◽  
Categorization Task ◽  
Visual Categorization ◽  
Per Se ◽  
The Brain

We have previously reported the presence of dehydroepiandosterone (DHEA) in the dayold- chick brain, and a role for it in enhanced memory formation. Here we confirm that intracerebral injections of DHEA 5 min before training on the weak passive avoidance task enhanced recall 24 hours after training. Recall per se on an appetitive visual categorization task was not altered by administration of DHEA 5 min before training. However administration of DHEA 5 min before limited or very limited training on a visual categorization task (20 or 10 pecks only) appeared to enhance consolidation of this task at test 24 h after training; reducing the latency and total time taken to complete the test (60 pecks), while not detrimentally altering accuracy. Moreover, DHEA is unlikely to induce this effect via possible anxiolytic effects because it did not alter behavior in the open field test. We also examined diffusion of DHEA throughout the brain at various stages following intracerebral injection.

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