Temporal lobe
The
temporal lobes are part of the
cerebrum. They lie at the sides of the
brain, beneath the
lateral or Sylvian fissure. Seen in profile, the
human brain looks something like a
boxing glove. The temporal lobes are where the thumbs would be.
Behind (posterior to) the temporal lobes is the
occipital lobe, where visual information first reaches the cortex. Above and to the rear are the
parietal lobes. The temporal lobes enclose the
hippocampi and
amygdalae.
The
superior temporal gyrus includes an area (within the Sylvian fissure) where auditory signals from the
cochlea (relayed via several subcortical nuclei) first reach the
cerebral cortex. This part of the cortex (
primary auditory cortex) is involved in hearing. Adjacent areas in the superior, posterior and lateral parts of the temporal lobes are involved in high-level auditory processing. In humans this includes speech, for which the left temporal lobe in particular seems to be specialized.
Wernicke's area which spans the region between temporal and parietal lobes plays a key role (in tandem with
Broca's area, which is in the frontal lobe). The functions of the left temporal lobe are not limited to low-level perception but extend to comprehension, naming,
verbal memory and other language functions.
The underside (ventral) part of the temporal cortices appear to be involved in high-level visual processing of complex stimuli such as
faces (
fusiform gyrus) and scenes (
parahippocampal gyrus). Anterior parts of this
ventral stream for
visual processing are involved in object perception and recognition.
The medial temporal lobes (near the sagittal plane that divides left and right
cerebral hemispheres) are thought to be involved in
episodic/
declarative memory. Deep inside the medial temporal lobes, the
hippocampi seem to be particularly important for memory function, and they also seem to play a part in controlling spatial behavior.
*
Brain*
Hippocampus*
Temporal lobe epilepsy*
University of Idaho
