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Lashley pioneered experimental work conducted on rats with surgically induced brain lesions, by damaging or removing specific areas of a rat’s cortex, either before or after the animals were trained in mazes and visual discrimination.
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Karl Spencer Lashley (June 7, 1890 – August 7, 1958) was an American psychologist and behaviorist remembered for his contributions to the study of learning and memory. A Review of General Psychology survey, published in 2002, ranked Lashley as the 61st most cited psychologist of the 20th century.
Jun 3, 2024 · Karl Lashley was an American psychologist who conducted quantitative investigations of the relation between brain mass and learning ability. While working toward a Ph.D. in genetics at Johns Hopkins University (1914), Lashley became associated with the influential psychologist John B. Watson.
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Karl Lashley began exploring this problem, about 100 years ago, by making lesions in the brains of animals such as rats and monkeys. He was searching for evidence of the engram : the group of neurons that serve as the “physical representation of memory” (Josselyn, 2010).
Feb 10, 2009 · In the 1920s the behavioral psychologist Karl Lashley conducted a now famous series of experiments in an attempt to identify the part of the brain in which memories are stored. He trained...
Carl Duncan published a seminal paper reporting that electroconvulsive shock stimulation applied to rats after they were trained induced retrograde amnesia. 24 The findings of this study and a great many subsequent studies using other kinds of treatments administered posttraining provided strong evidence that initially fragile memory traces ...
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He trained rats to perform specific tasks, then lesioned specific areas of the rat cortex, either before or after the animals received the training. The cortical lesions had specific effects on acquisition and retention of knowledge. By 1950, Lashley had distilled his research into two theories.
